defmodule Flop.Phoenix do
@moduledoc """
Phoenix components for pagination, sortable tables and filter forms with
[Flop](https://hex.pm/packages/flop).
## Introduction
Please refer to the [Readme](README.md) for an introduction.
## Customization
The default classes, attributes, texts and symbols can be overridden by
passing the `opts` assign. Since you probably will use the same `opts` in all
your templates, you can globally configure an `opts` provider function for
each component.
The functions have to return the options as a keyword list. The overrides
are deep-merged into the default options.
defmodule MyAppWeb.CoreComponents do
use Phoenix.Component
def pagination_opts do
[
ellipsis_attrs: [class: "ellipsis"],
ellipsis_content: "‥",
next_link_attrs: [class: "next"],
next_link_content: next_icon(),
page_links: {:ellipsis, 7},
pagination_link_aria_label: &"\#{&1}ページ目へ",
previous_link_attrs: [class: "prev"],
previous_link_content: previous_icon()
]
end
defp next_icon do
assigns = %{}
~H\"""
<i class="fas fa-chevron-right"/>
\"""
end
defp previous_icon do
assigns = %{}
~H\"""
<i class="fas fa-chevron-left"/>
\"""
end
def table_opts do
[
container: true,
container_attrs: [class: "table-container"],
no_results_content: no_results_content(),
table_attrs: [class: "table"]
]
end
defp no_results_content do
assigns = %{}
~H\"""
<p>Nothing found.</p>
\"""
end
end
Refer to `t:pagination_option/0` and `t:table_option/0` for a list of
available options and defaults.
Once you have defined these functions, you can reference them with a
module/function tuple in `config/config.exs`.
```elixir
config :flop_phoenix,
pagination: [opts: {MyApp.CoreComponents, :pagination_opts}],
table: [opts: {MyApp.CoreComponents, :table_opts}]
```
## Hiding default parameters
Default values for page size and ordering are omitted from the query
parameters. If you pass the `:for` assign, the Flop.Phoenix function will
pick up the default values from the schema module deriving `Flop.Schema`.
## Links
Links are generated with `Phoenix.Components.link/1`. This will
lead to `<a>` tags with `data-phx-link` and `data-phx-link-state` attributes,
which will be ignored outside of LiveViews and LiveComponents.
When used within a LiveView or LiveComponent, you will need to handle the new
params in the `c:Phoenix.LiveView.handle_params/3` callback of your LiveView
module.
## Using JS commands
You can pass a `Phoenix.LiveView.JS` command as `on_paginate` and `on_sort`
attributes.
If used with the `path` attribute, the URL will be patched _and_ the given
JS command will be executed.
If used without the `path` attribute, you will need to include a `push`
command to trigger an event when a pagination or sort link is clicked.
You can set a different target by assigning a `:target`. The value
will be used as the `phx-target` attribute.
<Flop.Phoenix.table
items={@items}
meta={@meta}
on_sort={JS.push("sort-pets")}
target={@myself}
/>
<Flop.Phoenix.pagination
meta={@meta}
on_paginate={JS.push("paginate-pets")}
target={@myself}
/>
You will need to handle the event in the `c:Phoenix.LiveView.handle_event/3`
or `c:Phoenix.LiveComponent.handle_event/3` callback of your
LiveView or LiveComponent module. The event name will be the one you set with
the `:event` option.
def handle_event("paginate-pets", %{"page" => page}, socket) do
flop = Flop.set_page(socket.assigns.meta.flop, page)
with {:ok, {pets, meta}} <- Pets.list_pets(flop) do
{:noreply, assign(socket, pets: pets, meta: meta)}
end
end
def handle_event("sort-pets", %{"order" => order}, socket) do
flop = Flop.push_order(socket.assigns.meta.flop, order)
with {:ok, {pets, meta}} <- Pets.list_pets(flop) do
{:noreply, assign(socket, pets: pets, meta: meta)}
end
end
"""
use Phoenix.Component
import Phoenix.HTML.Form,
only: [
input_id: 2,
input_name: 2,
input_value: 2
]
alias Flop.Meta
alias Flop.Phoenix.CursorPagination
alias Flop.Phoenix.Misc
alias Flop.Phoenix.Pagination
alias Flop.Phoenix.Table
alias Phoenix.HTML.Form
alias Phoenix.LiveView.JS
alias Plug.Conn.Query
@typedoc """
Defines the available options for `Flop.Phoenix.pagination/1`.
- `:current_link_attrs` - The attributes for the link to the current page.
Default: `#{inspect(Pagination.default_opts()[:current_link_attrs])}`.
- `:disabled_class` - The class which is added to disabled links. Default:
`#{inspect(Pagination.default_opts()[:disabled_class])}`.
- `:ellipsis_attrs` - The attributes for the `<span>` that wraps the
ellipsis.
Default: `#{inspect(Pagination.default_opts()[:ellipsis_attrs])}`.
- `:ellipsis_content` - The content for the ellipsis element.
Default: `#{inspect(Pagination.default_opts()[:ellipsis_content])}`.
- `:next_link_attrs` - The attributes for the link to the next page.
Default: `#{inspect(Pagination.default_opts()[:next_link_attrs])}`.
- `:next_link_content` - The content for the link to the next page.
Default: `#{inspect(Pagination.default_opts()[:next_link_content])}`.
- `:page_links` - Specifies how many page links should be rendered.
Default: `#{inspect(Pagination.default_opts()[:page_links])}`.
- `:all` - Renders all page links.
- `{:ellipsis, n}` - Renders `n` page links. Renders ellipsis elements if
there are more pages than displayed.
- `:hide` - Does not render any page links.
- `:pagination_link_aria_label` - 1-arity function that takes a page number
and returns an aria label for the corresponding page link.
Default: `&"Go to page \#{&1}"`.
- `:pagination_link_attrs` - The attributes for the pagination links.
Default: `#{inspect(Pagination.default_opts()[:pagination_link_attrs])}`.
- `:pagination_list_attrs` - The attributes for the pagination list.
Default: `#{inspect(Pagination.default_opts()[:pagination_list_attrs])}`.
- `:pagination_list_item_attrs` - The attributes for the pagination list items.
Default: `#{inspect(Pagination.default_opts()[:pagination_list_item_attrs])}`.
- `:previous_link_attrs` - The attributes for the link to the previous page.
Default: `#{inspect(Pagination.default_opts()[:previous_link_attrs])}`.
- `:previous_link_content` - The content for the link to the previous page.
Default: `#{inspect(Pagination.default_opts()[:previous_link_content])}`.
- `:wrapper_attrs` - The attributes for the `<nav>` element that wraps the
pagination links.
Default: `#{inspect(Pagination.default_opts()[:wrapper_attrs])}`.
"""
@type pagination_option ::
{:current_link_attrs, keyword}
| {:disabled_class, String.t()}
| {:ellipsis_attrs, keyword}
| {:ellipsis_content, Phoenix.HTML.safe() | binary}
| {:next_link_attrs, keyword}
| {:next_link_content, Phoenix.HTML.safe() | binary}
| {:page_links, :all | :hide | {:ellipsis, pos_integer}}
| {:pagination_link_aria_label, (pos_integer -> binary)}
| {:pagination_link_attrs, keyword}
| {:pagination_list_attrs, keyword}
| {:pagination_list_item_attrs, keyword}
| {:previous_link_attrs, keyword}
| {:previous_link_content, Phoenix.HTML.safe() | binary}
| {:wrapper_attrs, keyword}
@typedoc """
Defines the available options for `Flop.Phoenix.cursor_pagination/1`.
- `:disabled_class` - The class which is added to disabled links. Default:
`#{inspect(CursorPagination.default_opts()[:disabled_class])}`.
- `:next_link_attrs` - The attributes for the link to the next page.
Default: `#{inspect(CursorPagination.default_opts()[:next_link_attrs])}`.
- `:next_link_content` - The content for the link to the next page.
Default: `#{inspect(CursorPagination.default_opts()[:next_link_content])}`.
- `:previous_link_attrs` - The attributes for the link to the previous page.
Default: `#{inspect(CursorPagination.default_opts()[:previous_link_attrs])}`.
- `:previous_link_content` - The content for the link to the previous page.
Default: `#{inspect(CursorPagination.default_opts()[:previous_link_content])}`.
- `:wrapper_attrs` - The attributes for the `<nav>` element that wraps the
pagination links.
Default: `#{inspect(CursorPagination.default_opts()[:wrapper_attrs])}`.
"""
@type cursor_pagination_option ::
{:disabled_class, String.t()}
| {:next_link_attrs, keyword}
| {:next_link_content, Phoenix.HTML.safe() | binary}
| {:previous_link_attrs, keyword}
| {:previous_link_content, Phoenix.HTML.safe() | binary}
| {:wrapper_attrs, keyword}
@typedoc """
Defines the available options for `Flop.Phoenix.table/1`.
- `:container` - Wraps the table in a `<div>` if `true`.
Default: `#{inspect(Table.default_opts()[:container])}`.
- `:container_attrs` - The attributes for the table container.
Default: `#{inspect(Table.default_opts()[:container_attrs])}`.
- `:no_results_content` - Any content that should be rendered if there are no
results. Default: `<p>No results.</p>`.
- `:table_attrs` - The attributes for the `<table>` element.
Default: `#{inspect(Table.default_opts()[:table_attrs])}`.
- `:th_wrapper_attrs` - The attributes for the `<span>` element that wraps the
header link and the order direction symbol.
Default: `#{inspect(Table.default_opts()[:th_wrapper_attrs])}`.
- `:symbol_asc` - The symbol that is used to indicate that the column is
sorted in ascending order.
Default: `#{inspect(Table.default_opts()[:symbol_asc])}`.
- `:symbol_attrs` - The attributes for the `<span>` element that wraps the
order direction indicator in the header columns.
Default: `#{inspect(Table.default_opts()[:symbol_attrs])}`.
- `:symbol_desc` - The symbol that is used to indicate that the column is
sorted in ascending order.
Default: `#{inspect(Table.default_opts()[:symbol_desc])}`.
- `:symbol_unsorted` - The symbol that is used to indicate that the column is
not sorted. Default: `#{inspect(Table.default_opts()[:symbol_unsorted])}`.
- `:tbody_attrs`: Attributes to be added to the `<tbody>` tag within the
`<table>`. Default: `#{inspect(Table.default_opts()[:tbody_attrs])}`.
- `:tbody_td_attrs`: Attributes to be added to each `<td>` tag within the
`<tbody>`. Default: `#{inspect(Table.default_opts()[:tbody_td_attrs])}`.
- `:thead_attrs`: Attributes to be added to the `<thead>` tag within the
`<table>`. Default: `#{inspect(Table.default_opts()[:thead_attrs])}`.
- `:tbody_tr_attrs`: Attributes to be added to each `<tr>` tag within the
`<tbody>`. A function with arity of 1 may be passed to dynamically generate
the attrs based on row data.
Default: `#{inspect(Table.default_opts()[:tbody_tr_attrs])}`.
- `:thead_th_attrs`: Attributes to be added to each `<th>` tag within the
`<thead>`. Default: `#{inspect(Table.default_opts()[:thead_th_attrs])}`.
- `:thead_tr_attrs`: Attributes to be added to each `<tr>` tag within the
`<thead>`. Default: `#{inspect(Table.default_opts()[:thead_tr_attrs])}`.
"""
@type table_option ::
{:container, boolean}
| {:container_attrs, keyword}
| {:no_results_content, Phoenix.HTML.safe() | binary}
| {:symbol_asc, Phoenix.HTML.safe() | binary}
| {:symbol_attrs, keyword}
| {:symbol_desc, Phoenix.HTML.safe() | binary}
| {:symbol_unsorted, Phoenix.HTML.safe() | binary}
| {:table_attrs, keyword}
| {:tbody_attrs, keyword}
| {:thead_attrs, keyword}
| {:tbody_td_attrs, keyword}
| {:tbody_tr_attrs, keyword | (any -> keyword)}
| {:th_wrapper_attrs, keyword}
| {:thead_th_attrs, keyword}
| {:thead_tr_attrs, keyword}
@doc """
Generates a pagination element.
## Examples
<Flop.Phoenix.pagination
meta={@meta}
path={~p"/pets"}
/>
<Flop.Phoenix.pagination
meta={@meta}
path={{Routes, :pet_path, [@socket, :index]}}
/>
## Page link options
By default, page links for all pages are shown. You can limit the number of
page links or disable them altogether by passing the `:page_links` option.
- `:all`: Show all page links (default).
- `:hide`: Don't show any page links. Only the previous/next links will be
shown.
- `{:ellipsis, x}`: Limits the number of page links. The first and last page
are always displayed. The `x` refers to the number of additional page links
to show.
## Pagination link aria label
For the page links, there is the `:pagination_link_aria_label` option to set
the aria label. Since the page number is usually part of the aria label, you
need to pass a function that takes the page number as an integer and returns
the label as a string. The default is `&"Goto page \#{&1}"`.
## Previous/next links
By default, the previous and next links contain the texts `Previous` and
`Next`. To change this, you can pass the `:previous_link_content` and
`:next_link_content` options.
"""
@doc section: :components
@spec pagination(map) :: Phoenix.LiveView.Rendered.t()
attr :meta, Flop.Meta,
required: true,
doc: """
The meta information of the query as returned by the `Flop` query functions.
"""
attr :path, :any,
default: nil,
doc: """
If set, the current view is patched with updated query parameters when a
pagination link is clicked. In case the `on_paginate` attribute is set as
well, the URL is patched _and_ the given command is executed.
The value must be either a URI string (Phoenix verified route), an MFA or FA
tuple (Phoenix route helper), or a 1-ary path builder function. See
`Flop.Phoenix.build_path/3` for details.
"""
attr :on_paginate, JS,
default: nil,
doc: """
A `Phoenix.LiveView.JS` command that is triggered when a pagination link is
clicked.
If used without the `path` attribute, you should include a `push` operation
to handle the event with the `handle_event` callback.
<.pagination
meta={@meta}
on_paginate={
JS.dispatch("my_app:scroll_to", to: "#pet-table") |> JS.push("paginate")
}
/>
If used with the `path` attribute, the URL is patched _and_ the given
JS command is executed.
<.pagination
meta={@meta}
path={~"/pets"}
on_paginate={JS.dispatch("my_app:scroll_to", to: "#pet-table")}
/>
With the above attributes in place, you can add the following JavaScript to
your application to scroll to the top of your table whenever a pagination
link is clicked:
```js
window.addEventListener("my_app:scroll_to", (e) => {
e.target.scrollIntoView();
});
```
You can use CSS to scroll to the new position smoothly.
```css
html {
scroll-behavior: smooth;
}
```
"""
attr :event, :string,
default: nil,
doc: """
If set, `Flop.Phoenix` will render links with a `phx-click` attribute.
Alternatively, set `:path`, if you want the parameters to appear in the URL.
Deprecated in favor of `on_paginate`.
"""
attr :target, :string,
default: nil,
doc: """
Sets the `phx-target` attribute for the pagination links.
"""
attr :opts, :list,
default: [],
doc: """
Options to customize the pagination. See
`t:Flop.Phoenix.pagination_option/0`. Note that the options passed to the
function are deep merged into the default options. Since these options will
likely be the same for all the tables in a project, it is recommended to
define them once in a function or set them in a wrapper function as
described in the `Customization` section of the module documentation.
"""
def pagination(%{path: nil, on_paginate: nil, event: nil}) do
raise Flop.Phoenix.PathOrJSError, component: :pagination
end
def pagination(%{meta: meta, opts: opts, path: path} = assigns) do
assigns =
assigns
|> assign(:opts, Pagination.merge_opts(opts))
|> assign(
:page_link_helper,
Pagination.build_page_link_helper(meta, path)
)
|> assign(:path, nil)
~H"""
<nav :if={@meta.errors == [] && @meta.total_pages > 1} {@opts[:wrapper_attrs]}>
<.pagination_link
disabled={!@meta.has_previous_page?}
disabled_class={@opts[:disabled_class]}
event={@event}
target={@target}
page={@meta.previous_page}
path={@page_link_helper.(@meta.previous_page)}
on_paginate={@on_paginate}
{@opts[:previous_link_attrs]}
>
<%= @opts[:previous_link_content] %>
</.pagination_link>
<.pagination_link
disabled={!@meta.has_next_page?}
disabled_class={@opts[:disabled_class]}
event={@event}
target={@target}
page={@meta.next_page}
path={@page_link_helper.(@meta.next_page)}
on_paginate={@on_paginate}
{@opts[:next_link_attrs]}
>
<%= @opts[:next_link_content] %>
</.pagination_link>
<.page_links
event={@event}
meta={@meta}
on_paginate={@on_paginate}
page_link_helper={@page_link_helper}
opts={@opts}
target={@target}
/>
</nav>
"""
end
attr :meta, Flop.Meta, required: true
attr :on_paginate, JS
attr :page_link_helper, :any, required: true
attr :event, :string, required: true
attr :target, :string, required: true
attr :opts, :list, required: true
defp page_links(%{meta: meta} = assigns) do
max_pages =
Pagination.max_pages(assigns.opts[:page_links], assigns.meta.total_pages)
range =
first..last =
Pagination.get_page_link_range(
meta.current_page,
max_pages,
meta.total_pages
)
assigns = assign(assigns, first: first, last: last, range: range)
~H"""
<ul :if={@opts[:page_links] != :hide} {@opts[:pagination_list_attrs]}>
<li :if={@first > 1} {@opts[:pagination_list_item_attrs]}>
<.pagination_link
event={@event}
target={@target}
page={1}
path={@page_link_helper.(1)}
on_paginate={@on_paginate}
{Pagination.attrs_for_page_link(1, @meta, @opts)}
>
1
</.pagination_link>
</li>
<li :if={@first > 2} {@opts[:pagination_list_item_attrs]}>
<span {@opts[:ellipsis_attrs]}><%= @opts[:ellipsis_content] %></span>
</li>
<li :for={page <- @range} {@opts[:pagination_list_item_attrs]}>
<.pagination_link
event={@event}
target={@target}
page={page}
path={@page_link_helper.(page)}
on_paginate={@on_paginate}
{Pagination.attrs_for_page_link(page, @meta, @opts)}
>
<%= page %>
</.pagination_link>
</li>
<li :if={@last < @meta.total_pages - 1}>
<span {@opts[:ellipsis_attrs]}><%= @opts[:ellipsis_content] %></span>
</li>
<li :if={@last < @meta.total_pages} {@opts[:pagination_list_item_attrs]}>
<.pagination_link
event={@event}
target={@target}
page={@meta.total_pages}
path={@page_link_helper.(@meta.total_pages)}
on_paginate={@on_paginate}
{Pagination.attrs_for_page_link(@meta.total_pages, @meta, @opts)}
>
<%= @meta.total_pages %>
</.pagination_link>
</li>
</ul>
"""
end
attr :path, :string
attr :on_paginate, JS
attr :event, :string, required: true
attr :target, :string, required: true
attr :page, :integer, required: true
attr :disabled, :boolean, default: false
attr :disabled_class, :string
attr :rest, :global
slot :inner_block
defp pagination_link(
%{disabled: true, disabled_class: disabled_class} = assigns
) do
rest =
Map.update(assigns.rest, :class, disabled_class, fn class ->
[class, disabled_class]
end)
assigns = assign(assigns, :rest, rest)
~H"""
<span {@rest} class={@disabled_class}>
<%= render_slot(@inner_block) %>
</span>
"""
end
defp pagination_link(%{event: event} = assigns) when is_binary(event) do
~H"""
<.link phx-click={@event} phx-target={@target} phx-value-page={@page} {@rest}>
<%= render_slot(@inner_block) %>
</.link>
"""
end
defp pagination_link(%{on_paginate: nil, path: path} = assigns)
when is_binary(path) do
~H"""
<.link patch={@path} {@rest}>
<%= render_slot(@inner_block) %>
</.link>
"""
end
defp pagination_link(%{} = assigns) do
~H"""
<.link
patch={@path}
phx-click={@on_paginate}
phx-target={@target}
phx-value-page={@page}
{@rest}
>
<%= render_slot(@inner_block) %>
</.link>
"""
end
@doc """
Renders a cursor pagination element.
## Examples
<Flop.Phoenix.cursor_pagination
meta={@meta}
path={~p"/pets"}
/>
<Flop.Phoenix.cursor_pagination
meta={@meta}
path={{Routes, :pet_path, [@socket, :index]}}
/>
## Handling parameters and JS commands
If you set the `path` assign, a link with query parameters is rendered.
In a LiveView, you need to handle the parameters in the
`c:Phoenix.LiveView.handle_params/3` callback.
def handle_params(params, _, socket) do
{pets, meta} = MyApp.list_pets(params)
{:noreply, assign(socket, meta: meta, pets: pets)}
end
If you use LiveView and set the `on_paginate` attribute, you need to update
the Flop parameters in the `handle_event/3` callback.
def handle_event("paginate-users", %{"to" => to}, socket) do
flop = Flop.set_cursor(socket.assigns.meta, to)
{pets, meta} = MyApp.list_pets(flop)
{:noreply, assign(socket, meta: meta, pets: pets)}
end
## Getting the right parameters from Flop
This component requires the start and end cursors to be set in `Flop.Meta`. If
you pass a `Flop.Meta` struct with page or offset-based parameters, this will
result in an error. You can enforce cursor-based pagination in your query
function with the `default_pagination_type` and `pagination_types` options.
def list_pets(params) do
Flop.validate_and_run!(Pet, params,
for: Pet,
default_pagination_type: :first,
pagination_types: [:first, :last]
)
end
`default_pagination_type` ensures that Flop defaults to the right pagination
type when it cannot determine the type from the parameters. `pagination_types`
ensures that parameters for other types are not accepted.
## Order fields
The pagination cursor is based on the `ORDER BY` fields of the query. It is
important that the combination of order fields is unique across the data set.
You can use:
- the field with the primary key
- a field with a unique index
- all fields of a composite primary key or unique index
If you want to order by fields that are not unique, you can add the primary
key as the last order field. For example, if you want to order by family name
and given name, you should set the `order_by` parameter to
`[:family_name, :given_name, :id]`.
"""
@doc section: :components
@spec cursor_pagination(map) :: Phoenix.LiveView.Rendered.t()
attr :meta, Flop.Meta,
required: true,
doc: """
The meta information of the query as returned by the `Flop` query functions.
"""
attr :path, :any,
default: nil,
doc: """
If set, the current view is patched with updated query parameters when a
pagination link is clicked. In case the `on_paginate` attribute is set as
well, the URL is patched _and_ the given JS command is executed.
The value must be either a URI string (Phoenix verified route), an MFA or FA
tuple (Phoenix route helper), or a 1-ary path builder function. See
`Flop.Phoenix.build_path/3` for details.
"""
attr :on_paginate, JS,
default: nil,
doc: """
A `Phoenix.LiveView.JS` command that is triggered when a pagination link is
clicked.
If used without the `path` attribute, you should include a `push` operation
to handle the event with the `handle_event` callback.
<.cursor_pagination
meta={@meta}
on_paginate={
JS.dispatch("my_app:scroll_to", to: "#pet-table") |> JS.push("paginate")
}
/>
If used with the `path` attribute, the URL is patched _and_ the given JS
command is executed.
<.cursor_pagination
meta={@meta}
path={~"/pets"}
on_paginate={JS.dispatch("my_app:scroll_to", to: "#pet-table")}
/>
With the above attributes in place, you can add the following JavaScript to
your application to scroll to the top of your table whenever a pagination
link is clicked:
```js
window.addEventListener("my_app:scroll_to", (e) => {
e.target.scrollIntoView();
});
```
You can use CSS to scroll to the new position smoothly.
```css
html {
scroll-behavior: smooth;
}
```
"""
attr :event, :string,
default: nil,
doc: """
If set, `Flop.Phoenix` will render links with a `phx-click` attribute.
Alternatively, set `:path`, if you want the parameters to appear in the URL.
Deprecated. Use `on_paginate` instead.
"""
attr :target, :string,
default: nil,
doc: "Sets the `phx-target` attribute for the pagination links."
attr :reverse, :boolean,
default: false,
doc: """
By default, the `next` link moves forward with the `:after` parameter set to
the end cursor, and the `previous` link moves backward with the `:before`
parameter set to the start cursor. If `reverse` is set to `true`, the
destinations of the links are switched.
"""
attr :opts, :list,
default: [],
doc: """
Options to customize the pagination. See
`t:Flop.Phoenix.cursor_pagination_option/0`. Note that the options passed to
the function are deep merged into the default options. Since these options
will likely be the same for all the cursor pagination links in a project,
it is recommended to define them once in a function or set them in a
wrapper function as described in the `Customization` section of the module
documentation.
"""
def cursor_pagination(%{path: nil, on_paginate: nil, event: nil}) do
raise Flop.Phoenix.PathOrJSError, component: :cursor_pagination
end
def cursor_pagination(%{opts: opts} = assigns) do
assigns = assign(assigns, :opts, CursorPagination.merge_opts(opts))
~H"""
<nav :if={@meta.errors == []} {@opts[:wrapper_attrs]}>
<.cursor_pagination_link
direction={if @reverse, do: :next, else: :previous}
meta={@meta}
path={@path}
on_paginate={@on_paginate}
event={@event}
target={@target}
disabled={CursorPagination.disable?(@meta, :previous, @reverse)}
disabled_class={@opts[:disabled_class]}
{@opts[:previous_link_attrs]}
>
<%= @opts[:previous_link_content] %>
</.cursor_pagination_link>
<.cursor_pagination_link
direction={if @reverse, do: :previous, else: :next}
meta={@meta}
path={@path}
on_paginate={@on_paginate}
event={@event}
target={@target}
disabled={CursorPagination.disable?(@meta, :next, @reverse)}
disabled_class={@opts[:disabled_class]}
{@opts[:next_link_attrs]}
>
<%= @opts[:next_link_content] %>
</.cursor_pagination_link>
</nav>
"""
end
attr :direction, :atom, required: true
attr :meta, Flop.Meta, required: true
attr :path, :any, required: true
attr :on_paginate, JS
attr :event, :string, required: true
attr :target, :string, required: true
attr :disabled, :boolean, default: false
attr :disabled_class, :string, required: true
attr :rest, :global
slot :inner_block
defp cursor_pagination_link(
%{disabled: true, disabled_class: disabled_class} = assigns
) do
rest =
Map.update(assigns.rest, :class, disabled_class, fn class ->
[class, disabled_class]
end)
assigns = assign(assigns, :rest, rest)
~H"""
<span {@rest} class={@disabled_class}>
<%= render_slot(@inner_block) %>
</span>
"""
end
defp cursor_pagination_link(%{event: event} = assigns)
when is_binary(event) do
~H"""
<.link phx-click={@event} phx-target={@target} phx-value-to={@direction} {@rest}>
<%= render_slot(@inner_block) %>
</.link>
"""
end
defp cursor_pagination_link(%{on_paginate: nil} = assigns) do
~H"""
<.link
patch={CursorPagination.pagination_path(@direction, @path, @meta)}
{@rest}
>
<%= render_slot(@inner_block) %>
</.link>
"""
end
defp cursor_pagination_link(
%{direction: direction, path: path, meta: meta} = assigns
) do
path = CursorPagination.pagination_path(direction, path, meta)
assigns = assign(assigns, :path, path)
~H"""
<.link
patch={@path}
phx-click={@on_paginate}
phx-target={@target}
phx-value-to={@direction}
{@rest}
>
<%= render_slot(@inner_block) %>
</.link>
"""
end
@doc """
Generates a table with sortable columns.
## Example
```elixir
<Flop.Phoenix.table items={@pets} meta={@meta} path={~p"/pets"}>
<:col :let={pet} label="Name" field={:name}><%= pet.name %></:col>
<:col :let={pet} label="Age" field={:age}><%= pet.age %></:col>
</Flop.Phoenix.table>
```
## Flop.Schema
If you pass the `for` option when making the query with Flop, Flop Phoenix can
determine which table columns are sortable. It also hides the `order` and
`page_size` parameters if they match the default values defined with
`Flop.Schema`.
"""
@doc since: "0.6.0"
@doc section: :components
@spec table(map) :: Phoenix.LiveView.Rendered.t()
attr :id, :string,
doc: """
ID used on the table. If not set, an ID is chosen based on the schema
module derived from the `Flop.Meta` struct.
The ID is necessary in case the table is fed with a LiveView stream.
"""
attr :items, :list,
required: true,
doc: """
The list of items to be displayed in rows. This is the result list returned
by the query.
"""
attr :meta, Flop.Meta,
required: true,
doc: "The `Flop.Meta` struct returned by the query function."
attr :path, :any,
default: nil,
doc: """
If set, the current view is patched with updated query parameters when a
header link for sorting is clicked. In case the `on_sort` attribute is
set as well, the URL is patched _and_ the given JS command is executed.
The value must be either a URI string (Phoenix verified route), an MFA or FA
tuple (Phoenix route helper), or a 1-ary path builder function. See
`Flop.Phoenix.build_path/3` for details.
"""
attr :on_sort, JS,
default: nil,
doc: """
A `Phoenix.LiveView.JS` command that is triggered when a header link for
sorting is clicked.
If used without the `path` attribute, you should include a `push` operation
to handle the event with the `handle_event` callback.
<.table
items={@items}
meta={@meta}
on_sort={
JS.dispatch("my_app:scroll_to", to: "#pet-table") |> JS.push("sort")
}
/>
If used with the `path` attribute, the URL is patched _and_ the given
JS command is executed.
<.table
meta={@meta}
path={~"/pets"}
on_sort={JS.dispatch("my_app:scroll_to", to: "#pet-table")}
/>
"""
attr :event, :string,
default: nil,
doc: """
If set, `Flop.Phoenix` will render links with a `phx-click` attribute.
Alternatively, set `:path`, if you want the parameters to appear in the URL.
Deprecated in favor of `on_sort`.
"""
attr :target, :string,
default: nil,
doc: "Sets the `phx-target` attribute for the header links."
attr :caption, :string,
default: nil,
doc: "Content for the `<caption>` element."
attr :opts, :list,
default: [],
doc: """
Keyword list with additional options (see `t:Flop.Phoenix.table_option/0`).
Note that the options passed to the function are deep merged into the
default options. Since these options will likely be the same for all the
tables in a project, it is recommended to define them once in a function or
set them in a wrapper function as described in the `Customization` section
of the module documentation.
"""
attr :row_id, :any,
default: nil,
doc: """
Overrides the default function that retrieves the row ID from a stream item.
"""
attr :row_click, JS,
default: nil,
doc: """
Sets the `phx-click` function attribute for each row `td`. Expects to be a
function that receives a row item as an argument. This does not add the
`phx-click` attribute to the `action` slot.
Example:
```elixir
row_click={&JS.navigate(~p"/users/\#{&1}")}
```
"""
attr :row_item, :any,
default: &Function.identity/1,
doc: """
This function is called on the row item before it is passed to the :col
and :action slots.
"""
slot :col,
required: true,
doc: """
For each column to render, add one `<:col>` element.
```elixir
<:col :let={pet} label="Name" field={:name} col_style="width: 20%;">
<%= pet.name %>
</:col>
```
Any additional assigns will be added as attributes to the `<td>` elements.
""" do
attr :label, :any, doc: "The content for the header column."
attr :field, :atom,
doc: """
The field name for sorting. If set and the field is configured as sortable
in the schema, the column header will be clickable, allowing the user to
sort by that column. If the field is not marked as sortable or if the
`field` attribute is omitted or set to `nil` or `false`, the column header
will not be clickable.
"""
attr :directions, :any,
doc: """
An optional 2-element tuple used for custom ascending and descending sort
behavior for the column, i.e. `{:asc_nulls_last, :desc_nulls_first}`
"""
attr :show, :boolean,
doc: """
Boolean value to conditionally show the column. Defaults to `true`
Deprecated. Use `:if` instead.
"""
attr :hide, :boolean,
doc: """
Boolean value to conditionally hide the column. Defaults to `false`.
Deprecated. Use `:if` instead.
"""
attr :col_style, :string,
doc: """
If set, a `<colgroup>` element is rendered and the value of the
`col_style` assign is set as `style` attribute for the `<col>` element of
the respective column. You can set the `width`, `background`, `border`,
and `visibility` of a column this way.
"""
attr :col_class, :string,
doc: """
If set, a `<colgroup>` element is rendered and the value of the
`col_class` assign is set as `class` attribute for the `<col>` element of
the respective column. You can set the `width`, `background`, `border`,
and `visibility` of a column this way.
"""
attr :thead_th_attrs, :list,
doc: """
Additional attributes to pass to the `<th>` element as a static keyword
list. Note that these attributes will override any conflicting
`thead_th_attrs` that are set at the table level.
"""
attr :th_wrapper_attrs, :list,
doc: """
Additional attributes for the `<span>` element that wraps the
header link and the order direction symbol. Note that these attributes
will override any conflicting `th_wrapper_attrs` that are set at the table
level.
"""
attr :tbody_td_attrs, :any,
doc: """
Additional attributes to pass to the `<td>` element. May be provided as a
static keyword list, or as a 1-arity function to dynamically generate the
list using row data. Note that these attributes will override any
conflicting `tbody_td_attrs` that are set at the table level.
"""
end
slot :action,
doc: """
The slot for showing user actions in the last table column. These columns
do not receive the `row_click` attribute.
```elixir
<:action :let={user}>
<.link navigate={~p"/users/\#{user}"}>Show</.link>
</:action>
```
""" do
attr :label, :string, doc: "The content for the header column."
attr :show, :boolean,
doc: "Boolean value to conditionally show the column. Defaults to `true`."
attr :hide, :boolean,
doc:
"Boolean value to conditionally hide the column. Defaults to `false`."
attr :col_style, :string,
doc: """
If set, a `<colgroup>` element is rendered and the value of the
`col_style` assign is set as `style` attribute for the `<col>` element of
the respective column. You can set the `width`, `background`, `border`,
and `visibility` of a column this way.
"""
attr :col_class, :string,
doc: """
If set, a `<colgroup>` element is rendered and the value of the
`col_class` assign is set as `class` attribute for the `<col>` element of
the respective column. You can set the `width`, `background`, `border`,
and `visibility` of a column this way.
"""
attr :thead_th_attrs, :list,
doc: """
Any additional attributes to pass to the `<th>` as a keyword list.
"""
attr :tbody_td_attrs, :any,
doc: """
Any additional attributes to pass to the `<td>`. Can be a keyword list or
a function that takes the current row item as an argument and returns a
keyword list.
"""
end
slot :foot,
default: nil,
doc: """
You can optionally add a `foot`. The inner block will be rendered inside
a `tfoot` element.
<Flop.Phoenix.table>
<:foot>
<tr><td>Total: <span class="total"><%= @total %></span></td></tr>
</:foot>
</Flop.Phoenix.table>
"""
def table(%{path: nil, on_sort: nil, event: nil}) do
raise Flop.Phoenix.PathOrJSError, component: :table
end
def table(%{meta: meta, opts: opts} = assigns) do
assigns =
assigns
|> assign(:opts, Table.merge_opts(opts))
|> assign_new(:id, fn -> table_id(meta.schema) end)
~H"""
<%= if @items == [] do %>
<%= @opts[:no_results_content] %>
<% else %>
<%= if @opts[:container] do %>
<div id={@id <> "-container"} {@opts[:container_attrs]}>
<Table.render
caption={@caption}
col={@col}
foot={@foot}
on_sort={@on_sort}
event={@event}
id={@id}
items={@items}
meta={@meta}
opts={@opts}
path={@path}
target={@target}
row_id={@row_id}
row_click={@row_click}
row_item={@row_item}
action={@action}
/>
</div>
<% else %>
<Table.render
caption={@caption}
col={@col}
foot={@foot}
on_sort={@on_sort}
event={@event}
id={@id}
items={@items}
meta={@meta}
opts={@opts}
path={@path}
target={@target}
row_id={@row_id}
row_click={@row_click}
row_item={@row_item}
action={@action}
/>
<% end %>
<% end %>
"""
end
defp table_id(nil), do: "sortable-table"
defp table_id(schema) do
module_name = schema |> Module.split() |> List.last() |> Macro.underscore()
module_name <> "-table"
end
@doc """
Renders all inputs for a filter form including the hidden inputs.
## Example
def filter_form(%{meta: meta} = assigns) do
assigns = assign(assigns, :form, Phoenix.Component.to_form(meta))
~H\"""
<.form for={@form}>
<.filter_fields :let={i} form={@form} fields={[:email, :name]}>
<.input
field={i.field}
label={i.label}
type={i.type}
{i.rest}
/>
</.filter_fields>
</.form>
\"""
end
This assumes that you have defined an `input` component that renders a form
input including the label.
These options are passed to the inner block via `:let`:
- The `field` is a `Phoenix.HTML.FormField.t` struct.
- The `type` is the input type as a string, _not_ the name of the
`Phoenix.HTML.Form` input function (e.g. `"text"`, not `:text_input`). The
type is derived from the type of the field being filtered on, but it can
be overridden in the field options.
- `rest` contains any additional field options passed.
## Field configuration
The fields can be passed as atoms or keywords with additional options.
fields={[:name, :email]}
Or
fields={[
name: [label: gettext("Name")],
email: [
label: gettext("Email"),
op: :ilike_and,
type: "email"
],
age: [
label: gettext("Age"),
type: "select",
prompt: "",
options: [
{gettext("young"), :young},
{gettext("old"), :old)}
]
]
]}
Available options:
- `label` - Defaults to the humanized field name.
- `op` - Defaults to `:==`.
- `type` - Defaults to an input type depending on the Ecto type of the filter
field.
Any additional options will be passed to the input component (e.g. HTML
classes or a list of options).
"""
@doc since: "0.12.0"
@doc section: :components
@spec filter_fields(map) :: Phoenix.LiveView.Rendered.t()
attr :form, Phoenix.HTML.Form, required: true
attr :fields, :list,
default: [],
doc: """
The list of fields and field options. Note that inputs will not be rendered
for fields that are not marked as filterable in the schema
(see `Flop.Schema`).
If `dynamic` is set to `false`, only fields in this list are rendered. If
`dynamic` is set to `true`, only fields for filters present in the given
`Flop.Meta` struct are rendered, and the fields are rendered even if they
are not passed in the `fields` list. In the latter case, `fields` is
optional, but you can still pass label and input configuration this way.
Note that in a dynamic form, it is not possible to configure a single field
multiple times.
"""
attr :dynamic, :boolean,
default: false,
doc: """
If `true`, fields are only rendered for filters that are present in the
`Flop.Meta` struct passed to the form. You can use this for rendering filter
forms that allow the user to add and remove filters dynamically. The
`fields` assign is only used for looking up the options in that case.
"""
slot :inner_block,
doc: """
The necessary options for rendering a label and an input are passed to the
inner block, which allows you to render the fields with your existing
components.
<.filter_fields :let={i} form={@form} fields={[:email, :name]}>
<.input
field={i.field}
label={i.label}
type={i.type}
{i.rest}
/>
</.filter_fields>
The options passed to the inner block are:
- `field` - A `Phoenix.HTML.FormField` struct.
- `type` - The input type as a string.
- `label` - The label text as a string.
- `rest` - Any additional options passed in the field options.
"""
def filter_fields(assigns) do
ensure_meta_form!(assigns.form)
fields = normalize_filter_fields(assigns[:fields] || [])
field_opts = match_field_opts(assigns, fields)
inputs_for_fields = if assigns[:dynamic], do: nil, else: fields
assigns =
assigns
|> assign(:fields, inputs_for_fields)
|> assign(:field_opts, field_opts)
~H"""
<.hidden_inputs_for_filter form={@form} />
<%= for {ff, opts} <- inputs_for_filters(@form, @fields, @field_opts) do %>
<.hidden_inputs_for_filter form={ff} />
<%= render_slot(@inner_block, %{
field: ff[:value],
label: input_label(ff, opts[:label]),
type: type_for(ff, opts[:type]),
rest: Keyword.drop(opts, [:label, :op, :type])
}) %>
<% end %>
"""
end
defp inputs_for_filters(form, fields, field_opts) do
form.source
|> form.impl.to_form(form, :filters, fields: fields)
|> Enum.zip(field_opts)
end
defp normalize_filter_fields(fields) do
Enum.map(fields, fn
field when is_atom(field) ->
{field, []}
{field, opts} when is_atom(field) and is_list(opts) ->
{field, opts}
field ->
raise Flop.Phoenix.InvalidFilterFieldConfigError, value: field
end)
end
defp match_field_opts(%{dynamic: true, form: form}, fields) do
Enum.map(form.data.filters, fn %Flop.Filter{field: field} ->
fields[field] || []
end)
end
defp match_field_opts(_, fields) do
Keyword.values(fields)
end
defp input_label(_form, text) when is_binary(text), do: text
defp input_label(form, nil), do: form |> input_value(:field) |> humanize()
defp type_for(_form, type) when is_binary(type), do: type
defp type_for(form, nil), do: input_type_as_string(form)
defp input_type_as_string(form) do
form
|> PhoenixHTMLHelpers.Form.input_type(:value)
|> to_html_input_type()
end
defp humanize(atom) when is_atom(atom) do
atom
|> Atom.to_string()
|> humanize()
end
defp humanize(s) when is_binary(s) do
if String.ends_with?(s, "_id") do
s |> binary_part(0, byte_size(s) - 3) |> to_titlecase()
else
to_titlecase(s)
end
end
defp to_titlecase(s) do
s
|> String.replace("_", " ")
|> :string.titlecase()
end
# coveralls-ignore-start
defp to_html_input_type(:checkbox), do: "checkbox"
defp to_html_input_type(:color_input), do: "color"
defp to_html_input_type(:date_input), do: "date"
defp to_html_input_type(:date_select), do: "date"
defp to_html_input_type(:datetime_local_input), do: "datetime-local"
defp to_html_input_type(:datetime_select), do: "datetime-local"
defp to_html_input_type(:email_input), do: "email"
defp to_html_input_type(:file_input), do: "file"
defp to_html_input_type(:hidden_input), do: "hidden"
defp to_html_input_type(:multiple_select), do: "select"
defp to_html_input_type(:number_input), do: "number"
defp to_html_input_type(:password_input), do: "password"
defp to_html_input_type(:radio_button), do: "radio"
defp to_html_input_type(:range_input), do: "range"
defp to_html_input_type(:search_input), do: "search"
defp to_html_input_type(:select), do: "select"
defp to_html_input_type(:telephone_input), do: "tel"
defp to_html_input_type(:text_input), do: "text"
defp to_html_input_type(:textarea), do: "textarea"
defp to_html_input_type(:time_input), do: "time"
defp to_html_input_type(:time_select), do: "time"
defp to_html_input_type(:url_input), do: "url"
# coveralls-ignore-end
defp ensure_meta_form!(%Form{data: %Flop{}, source: %Meta{}}), do: :ok
defp ensure_meta_form!(_), do: raise(Flop.Phoenix.NoMetaFormError)
@doc """
Renders hidden inputs for the given form.
You can use this for convenience if you have a complex form layout that cannot
be accomplished with `Flop.Phoenix.filter_fields/1`. Put it as a direct child
of the `form` component to render the hidden inputs for pagination and order
parameters. Then use `PhoenixHTMLHelpers.Form.inputs_for/3` to render a single
filter field, and place this component within the anonymous function to render the
hidden inputs for the filter field and operator.
Since the filters are represented as an array in the params, make sure to
add the `offset` option so that the `Flop.Meta` can be properly mapped back to
your input fields. For every call to `inputs_for` always add the length of all
previous calls to `inputs_for` as offset.
<.form :let={f} for={@meta}>
<.hidden_inputs_for_filter form={@form} />
<div class="field-group">
<div class="field">
<%= PhoenixHTMLHelpers.Form.inputs_for f, :filters, [fields: [:name]], fn ff -> %>
<.hidden_inputs_for_filter form={ff} />
<.input label="Name" type="text" field={{ff, :value}} />
<% end %>
</div>
<div class="field">
<%= PhoenixHTMLHelpers.Form.inputs_for f, :filters, [fields: [{:email, op: :ilike}], offset: 1] fn ff -> %>
<.hidden_inputs_for_filter form={ff} />
<.input label="E-mail" type="email" field={{ff, :value}} />
<% end %>
</div>
</div>
</.form>
"""
@doc since: "0.16.0"
@doc section: :components
attr :form, Phoenix.HTML.Form, required: true
def hidden_inputs_for_filter(assigns) do
~H"""
<.hidden_inputs
:for={{field, value} <- @form.hidden}
form={@form}
field={field}
value={value}
/>
"""
end
attr :form, Phoenix.HTML.Form, required: true
attr :field, :atom, required: true
attr :value, :any, required: true
defp hidden_inputs(%{value: value} = assigns) when is_list(value) do
~H"""
<input
:for={{v, index} <- Enum.with_index(@value)}
type="hidden"
id={input_id(@form, @field) <> "_#{index}"}
name={input_name(@form, @field) <> "[]"}
value={v}
hidden
/>
"""
end
defp hidden_inputs(assigns) do
~H"""
<input
type="hidden"
id={input_id(@form, @field)}
name={input_name(@form, @field)}
value={@value}
hidden
/>
"""
end
@doc """
Converts a Flop struct into a keyword list that can be used as a query with
Phoenix verified routes or route helper functions.
## Default parameters
Default parameters for the limit and order parameters are omitted. The
defaults are determined by calling `Flop.get_option/3`.
- Pass the `:for` option to pick up the default values from a schema module
deriving `Flop.Schema`.
- Pass the `:backend` option to pick up the default values from your backend
configuration.
- If neither the schema module nor the backend module have default options
set, the function will fall back to the application environment.
## Encoding queries
To encode the returned query as a string, you will need to use
`Plug.Conn.Query.encode/1`. `URI.encode_query/1` does not support bracket
notation for arrays and maps.
## Date and time filters
If you use the result of this function directly with
`Phoenix.VerifiedRoutes.sigil_p/2` for verified routes or in a route helper
function, all cast filter values need to be able to be converted to a string
using the `Phoenix.Param` protocol.
This protocol is implemented by default for integers, binaries, atoms, and
structs. For structs, Phoenix's default behavior is to fetch the id field.
If you have filters with `Date`, `DateTime`, `NaiveDateTime`,
`Time` values, or any other custom structs (e.g. structs that represent
composite types like a range column), you will need to implement the protocol
for these specific structs in your application.
defimpl Phoenix.Param, for: Date do
def to_param(%Date{} = d), do: to_string(d)
end
defimpl Phoenix.Param, for: DateTime do
def to_param(%DateTime{} = dt), do: to_string(dt)
end
defimpl Phoenix.Param, for: NaiveDateTime do
def to_param(%NaiveDateTime{} = dt), do: to_string(dt)
end
defimpl Phoenix.Param, for: Time do
def to_param(%Time{} = t), do: to_string(t)
end
It is important that the chosen string representation can be cast back into
the Ecto type.
## Examples
iex> to_query(%Flop{})
[]
iex> f = %Flop{page: 5, page_size: 20}
iex> to_query(f)
[page_size: 20, page: 5]
iex> f = %Flop{first: 20, after: "g3QAAAABZAAEbmFtZW0AAAAFQXBwbGU="}
iex> to_query(f)
[first: 20, after: "g3QAAAABZAAEbmFtZW0AAAAFQXBwbGU="]
iex> f = %Flop{
...> filters: [
...> %Flop.Filter{field: :name, op: :=~, value: "Mag"},
...> %Flop.Filter{field: :age, op: :>, value: 25}
...> ]
...> }
iex> to_query(f)
[
filters: %{
0 => %{field: :name, op: :=~, value: "Mag"},
1 => %{field: :age, op: :>, value: 25}
}
]
iex> to_query(f)
[filters: %{0 => %{value: "Mag", op: :=~, field: :name}, 1 => %{value: 25, op: :>, field: :age}}]
iex> f = %Flop{page: 5, page_size: 20}
iex> to_query(f, default_limit: 20)
[page: 5]
Encoding the query as a string:
iex> f = %Flop{order_by: [:name, :age], order_directions: [:desc, :asc]}
iex> to_query(f)
[order_directions: [:desc, :asc], order_by: [:name, :age]]
iex> f |> to_query |> Plug.Conn.Query.encode()
"order_directions[]=desc&order_directions[]=asc&order_by[]=name&order_by[]=age"
"""
@doc since: "0.6.0"
@doc section: :miscellaneous
@spec to_query(Flop.t()) :: keyword
def to_query(%Flop{filters: filters} = flop, opts \\ []) do
filter_map =
filters
|> Stream.with_index()
|> Enum.into(%{}, fn {filter, index} ->
{index, Map.from_struct(filter)}
end)
default_limit = Flop.get_option(:default_limit, opts)
default_order = Flop.get_option(:default_order, opts)
[]
|> Misc.maybe_put(:offset, flop.offset, 0)
|> Misc.maybe_put(:page, flop.page, 1)
|> Misc.maybe_put(:after, flop.after)
|> Misc.maybe_put(:before, flop.before)
|> Misc.maybe_put(:page_size, flop.page_size, default_limit)
|> Misc.maybe_put(:limit, flop.limit, default_limit)
|> Misc.maybe_put(:first, flop.first, default_limit)
|> Misc.maybe_put(:last, flop.last, default_limit)
|> Misc.maybe_put_order_params(flop, default_order)
|> Misc.maybe_put(:filters, filter_map)
end
@doc """
Builds a path that includes query parameters for the given `Flop` struct
using the referenced Phoenix path helper function.
The first argument can be either one of:
- an MFA tuple (module, function name as atom, arguments)
- a 2-tuple (function, arguments)
- a URL string, usually produced with a verified route (e.g. `~p"/some/path"`)
- a function that takes the Flop parameters as a keyword list as an argument
Default values for `limit`, `page_size`, `order_by` and `order_directions` are
omitted from the query parameters. To pick up the default parameters from a
schema module deriving `Flop.Schema`, you need to pass the `:for` option. To
pick up the default parameters from the backend module, you need to pass the
`:backend` option. If you pass a `Flop.Meta` struct as the second argument,
these options are retrieved from the struct automatically.
> #### Date and Time Filters {: .info}
>
> When using filters on `Date`, `DateTime`, `NaiveDateTime` or `Time` fields,
> you may need to implement the `Phoenix.Param` protocol for these structs.
> See the documentation for `to_query/2`.
## Examples
### With a verified route
The examples below use plain URL strings without the p-sigil, so that the
doc tests work, but in your application, you can use verified routes or
anything else that produces a URL.
iex> flop = %Flop{page: 2, page_size: 10}
iex> path = build_path("/pets", flop)
iex> %URI{path: parsed_path, query: parsed_query} = URI.parse(path)
iex> {parsed_path, URI.decode_query(parsed_query)}
{"/pets", %{"page" => "2", "page_size" => "10"}}
The Flop query parameters will be merged into existing query parameters.
iex> flop = %Flop{page: 2, page_size: 10}
iex> path = build_path("/pets?species=dogs", flop)
iex> %URI{path: parsed_path, query: parsed_query} = URI.parse(path)
iex> {parsed_path, URI.decode_query(parsed_query)}
{"/pets", %{"page" => "2", "page_size" => "10", "species" => "dogs"}}
### With an MFA tuple
iex> flop = %Flop{page: 2, page_size: 10}
iex> build_path(
...> {Flop.PhoenixTest, :route_helper, [%Plug.Conn{}, :pets]},
...> flop
...> )
"/pets?page_size=10&page=2"
### With a function/arguments tuple
iex> pet_path = fn _conn, :index, query ->
...> "/pets?" <> Plug.Conn.Query.encode(query)
...> end
iex> flop = %Flop{page: 2, page_size: 10}
iex> build_path({pet_path, [%Plug.Conn{}, :index]}, flop)
"/pets?page_size=10&page=2"
We're defining fake path helpers for the scope of the doctests. In a real
Phoenix application, you would pass something like
`{Routes, :pet_path, args}` or `{&Routes.pet_path/3, args}` as the
first argument.
### Passing a `Flop.Meta` struct or a keyword list
You can also pass a `Flop.Meta` struct or a keyword list as the third
argument.
iex> pet_path = fn _conn, :index, query ->
...> "/pets?" <> Plug.Conn.Query.encode(query)
...> end
iex> flop = %Flop{page: 2, page_size: 10}
iex> meta = %Flop.Meta{flop: flop}
iex> build_path({pet_path, [%Plug.Conn{}, :index]}, meta)
"/pets?page_size=10&page=2"
iex> query_params = to_query(flop)
iex> build_path({pet_path, [%Plug.Conn{}, :index]}, query_params)
"/pets?page_size=10&page=2"
### Additional path parameters
If the path helper takes additional path parameters, just add them to the
second argument.
iex> user_pet_path = fn _conn, :index, id, query ->
...> "/users/\#{id}/pets?" <> Plug.Conn.Query.encode(query)
...> end
iex> flop = %Flop{page: 2, page_size: 10}
iex> build_path({user_pet_path, [%Plug.Conn{}, :index, 123]}, flop)
"/users/123/pets?page_size=10&page=2"
### Additional query parameters
If the last path helper argument is a query parameter list, the Flop
parameters are merged into it.
iex> pet_url = fn _conn, :index, query ->
...> "https://pets.flop/pets?" <> Plug.Conn.Query.encode(query)
...> end
iex> flop = %Flop{order_by: :name, order_directions: [:desc]}
iex> build_path({pet_url, [%Plug.Conn{}, :index, [user_id: 123]]}, flop)
"https://pets.flop/pets?user_id=123&order_directions[]=desc&order_by=name"
iex> build_path(
...> {pet_url,
...> [%Plug.Conn{}, :index, [category: "small", user_id: 123]]},
...> flop
...> )
"https://pets.flop/pets?category=small&user_id=123&order_directions[]=desc&order_by=name"
### Set page as path parameter
Finally, you can also pass a function that takes the Flop parameters as
a keyword list as an argument. Default values will not be included in the
parameters passed to the function. You can use this if you need to set some
of the parameters as path parameters instead of query parameters.
iex> flop = %Flop{page: 2, page_size: 10}
iex> build_path(
...> fn params ->
...> {page, params} = Keyword.pop(params, :page)
...> query = Plug.Conn.Query.encode(params)
...> if page, do: "/pets/page/\#{page}?\#{query}", else: "/pets?\#{query}"
...> end,
...> flop
...> )
"/pets/page/2?page_size=10"
Note that in this example, the anonymous function just returns a string. With
Phoenix 1.7, you will be able to use verified routes.
build_path(
fn params ->
{page, query} = Keyword.pop(params, :page)
if page, do: ~p"/pets/page/\#{page}?\#{query}", else: ~p"/pets?\#{query}"
end,
flop
)
Note that the keyword list passed to the path builder function is built using
`Plug.Conn.Query.encode/2`, which means filters are formatted as map with
integer keys.
### Set filter value as path parameter
If you need to set a filter value as a path parameter, you can use
`Flop.Filter.pop/3`.
iex> flop = %Flop{
...> page: 5,
...> order_by: [:published_at],
...> filters: [
...> %Flop.Filter{field: :category, op: :==, value: "announcements"}
...> ]
...> }
iex> build_path(
...> fn params ->
...> {page, params} = Keyword.pop(params, :page)
...> filters = Keyword.get(params, :filters, [])
...> {category, filters} = Flop.Filter.pop(filters, :category)
...> params = Keyword.put(params, :filters, filters)
...> query = Plug.Conn.Query.encode(params)
...>
...> case {page, category} do
...> {nil, nil} -> "/articles?\#{query}"
...> {page, nil} -> "/articles/page/\#{page}?\#{query}"
...> {nil, %{value: category}} -> "/articles/category/\#{category}?\#{query}"
...> {page, %{value: category}} -> "/articles/category/\#{category}/page/\#{page}?\#{query}"
...> end
...> end,
...> flop
...> )
"/articles/category/announcements/page/5?order_by[]=published_at"
"""
@doc since: "0.6.0"
@doc section: :miscellaneous
@spec build_path(
String.t()
| {module, atom, [any]}
| {function, [any]}
| (keyword -> String.t()),
Meta.t() | Flop.t() | keyword,
keyword
) :: String.t()
def build_path(path, meta_or_flop_or_params, opts \\ [])
def build_path(
path,
%Meta{backend: backend, flop: flop, schema: schema},
opts
) do
build_path(
path,
flop,
opts |> Keyword.put(:backend, backend) |> Keyword.put(:for, schema)
)
end
def build_path(path, %Flop{} = flop, opts) do
build_path(path, Flop.Phoenix.to_query(flop, opts))
end
def build_path({module, func, args}, flop_params, _opts)
when is_atom(module) and
is_atom(func) and
is_list(args) and
is_list(flop_params) do
final_args = build_final_args(args, flop_params)
apply(module, func, final_args)
end
def build_path({func, args}, flop_params, _opts)
when is_function(func) and
is_list(args) and
is_list(flop_params) do
final_args = build_final_args(args, flop_params)
apply(func, final_args)
end
def build_path(func, flop_params, _opts)
when is_function(func, 1) and is_list(flop_params) do
func.(flop_params)
end
def build_path(uri, flop_params, _opts)
when is_binary(uri) and is_list(flop_params) do
uri = URI.parse(uri)
query =
(uri.query || "")
|> Query.decode()
|> Map.merge(Map.new(flop_params))
query = if query != %{}, do: Query.encode(query), else: nil
uri
|> Map.put(:query, query)
|> URI.to_string()
end
defp build_final_args(args, flop_params) do
case Enum.reverse(args) do
[last_arg | rest] when is_list(last_arg) ->
query_arg = Keyword.merge(last_arg, flop_params)
Enum.reverse([query_arg | rest])
_ ->
args ++ [flop_params]
end
end
end
