defmodule Ash.Resource.Info do
@moduledoc "Introspection for resources"
alias Spark.Dsl.Extension
@deprecated "Use `Ash.Resource.set_metadata/2` instead"
defdelegate set_metadata(record, map), to: Ash.Resource
@deprecated "Use `Ash.Resource.put_metadata/3` instead"
defdelegate put_metadata(record, key, term), to: Ash.Resource
@deprecated "Use `Ash.Resource.unload_many/2` instead"
defdelegate unload_many(record, loads), to: Ash.Resource
@deprecated "Use `Ash.Resource.unload/2` instead"
defdelegate unload(record, key_or_path), to: Ash.Resource
@deprecated "Use `Ash.Resource.get_metadata/2` instead"
defdelegate get_metadata(record, key_or_path), to: Ash.Resource
@deprecated "Use `Ash.Resource.selected?/2` instead"
defdelegate selected?(record, field), to: Ash.Resource
@doc """
Retrieves a relationship path from the resource related by path, to the provided resource.
"""
def reverse_relationship(resource, path, acc \\ [])
def reverse_relationship(_, [], acc),
do: acc
def reverse_relationship(resource, [name | rest], acc) do
resource
|> relationships()
|> Enum.find(fn relationship ->
relationship.name == name
end)
|> case do
nil ->
nil
relationship ->
relationship.destination
|> relationships()
|> Enum.find(fn candidate ->
reverse_relationship?(relationship, candidate)
end)
|> case do
nil ->
nil
destination_relationship ->
reverse_relationship(relationship.destination, rest, [
destination_relationship.name | acc
])
end
end
end
defp reverse_relationship?(rel, destination_rel) do
rel.source == destination_rel.destination &&
rel.destination == destination_rel.source &&
rel.source_attribute == destination_rel.destination_attribute &&
rel.destination_attribute == destination_rel.source_attribute &&
Map.fetch(rel, :source_attribute_on_join_resource) ==
Map.fetch(destination_rel, :destination_attribute_on_join_resource) &&
Map.fetch(rel, :destination_attribute_on_join_resource) ==
Map.fetch(destination_rel, :source_attribute_on_join_resource) &&
is_nil(destination_rel.context) &&
is_nil(rel.context)
end
@doc """
The list of code interface definitions.
"""
@spec interfaces(Spark.Dsl.t() | Ash.Resource.t()) :: [Ash.Resource.Interface.t()]
def interfaces(resource) do
resource
|> Extension.get_entities([:code_interface])
|> Enum.filter(fn
%Ash.Resource.Interface{} ->
true
_ ->
false
end)
end
@doc """
The list of code interface calculation definitions.
"""
@spec calculation_interfaces(Spark.Dsl.t() | Ash.Resource.t()) :: [Ash.Resource.Interface.t()]
def calculation_interfaces(resource) do
resource
|> Extension.get_entities([:code_interface])
|> Enum.filter(fn
%Ash.Resource.CalculationInterface{} ->
true
_ ->
false
end)
end
@doc """
The Api to define the interface for, when defining it in the resource
"""
@spec define_interface_for(Spark.Dsl.t() | Ash.Resource.t()) :: atom | nil
def define_interface_for(resource) do
Extension.get_opt(resource, [:code_interface], :define_for, nil)
end
@doc """
Whether or not the resource is an embedded resource
"""
@spec embedded?(Spark.Dsl.t() | Ash.Resource.t()) :: boolean
def embedded?(resource) do
Extension.get_persisted(resource, :embedded?, false)
end
@doc """
The description of the resource
"""
@spec description(Spark.Dsl.t() | Ash.Resource.t()) :: String.t() | nil
def description(resource) do
Extension.get_opt(resource, [:resource], :description, "no description")
end
@doc """
A list of simple notifiers (require no DSL, used to avoid compile time dependencies)
"""
@spec simple_notifiers(Spark.Dsl.t() | Ash.Resource.t()) :: list(module)
def simple_notifiers(resource) do
Extension.get_opt(resource, [:resource], :simple_notifiers) || []
end
@doc """
The trace_name of the resource
"""
@spec trace_name(Spark.Dsl.t() | Ash.Resource.t()) :: String.t() | nil
def trace_name(resource) do
Extension.get_opt(resource, [:resource], :trace_name, nil) || to_string(short_name(resource))
end
@doc """
The short_name of the resource
"""
@spec short_name(Spark.Dsl.t() | Ash.Resource.t()) :: String.t() | nil
def short_name(resource) do
Extension.get_opt(resource, [:resource], :short_name, nil) || resource.default_short_name()
end
@doc """
The base filter of the resource
"""
@spec base_filter(Spark.Dsl.t() | Ash.Resource.t()) :: term
def base_filter(resource) do
Extension.get_opt(resource, [:resource], :base_filter, nil)
end
@doc """
The default context of the resource
"""
@spec default_context(Spark.Dsl.t() | Ash.Resource.t()) :: term
def default_context(resource) do
Extension.get_opt(resource, [:resource], :default_context, nil)
end
@doc "A list of identities for the resource"
@spec identities(Spark.Dsl.t() | Ash.Resource.t()) :: [Ash.Resource.Identity.t()]
def identities(resource) do
Extension.get_entities(resource, [:identities])
end
@doc "Get an identity by name from the resource"
@spec identity(Spark.Dsl.t() | Ash.Resource.t(), atom) :: Ash.Resource.Identity.t() | nil
def identity(resource, name) do
resource
|> identities()
|> Enum.find(&(&1.name == name))
end
@doc "A list of authorizers to be used when accessing"
@spec authorizers(Spark.Dsl.t() | Ash.Resource.t()) :: [module]
def authorizers(resource) do
Extension.get_persisted(resource, :authorizers, [])
end
@doc "A list of notifiers to be used when accessing"
@spec notifiers(Spark.Dsl.t() | Ash.Resource.t()) :: [module]
def notifiers(resource) do
Extension.get_persisted(resource, :notifiers, []) ++ simple_notifiers(resource)
end
@doc "A list of all validations for the resource for a given action type"
@spec validations(Spark.Dsl.t() | Ash.Resource.t(), :create | :update | :destroy) :: [
Ash.Resource.Validation.t()
]
def validations(resource, type) do
resource
|> validations()
|> Enum.filter(&(type in &1.on))
end
@doc "A list of all validations for the resource"
@spec validations(Spark.Dsl.t() | Ash.Resource.t()) :: [Ash.Resource.Validation.t()]
def validations(resource) do
Extension.get_entities(resource, [:validations])
end
@doc "A list of all changes for the resource for a given action type"
@spec changes(Spark.Dsl.t() | Ash.Resource.t(), :create | :update | :destroy) ::
list(
Ash.Resource.Validation.t()
| Ash.Resource.Change.t()
)
def changes(resource, type) do
resource
|> changes()
|> Enum.filter(&(type in &1.on))
end
@doc "A list of all changes for the resource"
@spec changes(Spark.Dsl.t() | Ash.Resource.t()) ::
list(Ash.Resource.Validation.t() | Ash.Resource.Change.t())
def changes(resource) do
Extension.get_entities(resource, [:changes])
end
@spec preparations(Spark.Dsl.t() | Ash.Resource.t()) :: list(Ash.Resource.Preparation.t())
def preparations(resource) do
Extension.get_entities(resource, [:preparations])
end
@doc "Whether or not a given module is a resource module"
@spec resource?(module) :: boolean
def resource?(module) when is_atom(module) do
Spark.Dsl.is?(module, Ash.Resource)
end
def resource?(_), do: false
@doc "A list of field names corresponding to the primary key"
@spec primary_key(Spark.Dsl.t() | Ash.Resource.t()) :: list(atom)
def primary_key(resource) do
Spark.Dsl.Extension.get_persisted(resource, :primary_key, [])
end
@doc "Wether or not all primary key attributes can be compared with simple_equality"
@spec primary_key_simple_equality?(Spark.Dsl.t() | Ash.Resource.t()) :: boolean()
def primary_key_simple_equality?(resource) do
Spark.Dsl.Extension.get_persisted(resource, :primary_key_simple_equality?, [])
end
@doc "Returns all relationships of a resource"
@spec relationships(Spark.Dsl.t() | Ash.Resource.t()) ::
list(Ash.Resource.Relationships.relationship())
def relationships(resource) do
Extension.get_entities(resource, [:relationships])
end
@doc "Get a relationship by name or path"
@spec relationship(Spark.Dsl.t() | Ash.Resource.t(), atom | String.t() | [atom | String.t()]) ::
Ash.Resource.Relationships.relationship() | nil
def relationship(resource, [name]) do
relationship(resource, name)
end
def relationship(resource, [name | rest]) do
case relationship(resource, name) do
nil ->
nil
relationship ->
relationship(relationship.destination, rest)
end
end
def relationship(resource, relationship_name) when is_binary(relationship_name) do
resource
|> relationships()
|> Enum.find(&(to_string(&1.name) == relationship_name))
end
def relationship(resource, relationship_name) do
resource
|> relationships()
|> Enum.find(&(&1.name == relationship_name))
end
@doc "Returns all public relationships of a resource"
@spec public_relationships(Spark.Dsl.t() | Ash.Resource.t()) ::
list(Ash.Resource.Relationships.relationship())
def public_relationships(resource) do
resource
|> relationships()
|> Enum.reject(& &1.private?)
end
@doc "Get a public relationship by name or path"
def public_relationship(resource, [name | rest]) do
case public_relationship(resource, name) do
nil ->
nil
relationship ->
public_relationship(relationship.destination, rest)
end
end
def public_relationship(resource, relationship_name) when is_binary(relationship_name) do
resource
|> relationships()
|> Enum.find(&(to_string(&1.name) == relationship_name && !&1.private?))
end
def public_relationship(resource, relationship_name) do
resource
|> relationships()
|> Enum.find(&(&1.name == relationship_name && !&1.private?))
end
@doc "The multitenancy strategy for a resource"
@spec multitenancy_strategy(Spark.Dsl.t() | Ash.Resource.t()) :: :context | :attribute | nil
def multitenancy_strategy(resource) do
Spark.Dsl.Extension.get_opt(resource, [:multitenancy], :strategy, nil)
end
@doc "The multitenancy attribute for a resource"
@spec multitenancy_attribute(Spark.Dsl.t() | Ash.Resource.t()) :: atom | nil
def multitenancy_attribute(resource) do
Spark.Dsl.Extension.get_opt(resource, [:multitenancy], :attribute, nil)
end
@doc "The function to parse the tenant from the attribute"
@spec multitenancy_parse_attribute(Spark.Dsl.t() | Ash.Resource.t()) :: {atom, atom, list(any)}
def multitenancy_parse_attribute(resource) do
Spark.Dsl.Extension.get_opt(
resource,
[:multitenancy],
:parse_attribute,
{__MODULE__, :_identity, []}
)
end
@doc false
def _identity(x), do: x
@doc "The MFA to parse the tenant from the attribute"
@spec multitenancy_global?(Spark.Dsl.t() | Ash.Resource.t()) :: atom | nil
def multitenancy_global?(resource) do
Spark.Dsl.Extension.get_opt(resource, [:multitenancy], :global?, nil)
end
@doc "The template for creating the tenant name"
@spec multitenancy_template(Spark.Dsl.t() | Ash.Resource.t()) :: atom | nil
def multitenancy_template(resource) do
Spark.Dsl.Extension.get_opt(resource, [:multitenancy], :template, nil)
end
@doc "Returns all calculations of a resource"
@spec calculations(Spark.Dsl.t() | Ash.Resource.t()) :: list(Ash.Resource.Calculation.t())
def calculations(resource) do
Extension.get_entities(resource, [:calculations])
end
@doc "Get a calculation by name"
@spec calculation(Spark.Dsl.t() | Ash.Resource.t(), atom | String.t()) ::
Ash.Resource.Calculation.t() | nil
def calculation(resource, name) when is_binary(name) do
resource
|> calculations()
|> Enum.find(&(to_string(&1.name) == name))
end
def calculation(resource, name) do
resource
|> calculations()
|> Enum.find(&(&1.name == name))
end
@doc "Returns all public calculations of a resource"
@spec public_calculations(Spark.Dsl.t() | Ash.Resource.t()) ::
list(Ash.Resource.Calculation.t())
def public_calculations(resource) do
resource
|> Extension.get_entities([:calculations])
|> Enum.reject(& &1.private?)
end
@doc "Get a public calculation by name"
@spec public_calculation(Spark.Dsl.t() | Ash.Resource.t(), atom | String.t()) ::
Ash.Resource.Calculation.t() | nil
def public_calculation(resource, name) when is_binary(name) do
resource
|> calculations()
|> Enum.find(&(to_string(&1.name) == name && !&1.private?))
end
def public_calculation(resource, name) do
resource
|> calculations()
|> Enum.find(&(&1.name == name && !&1.private?))
end
@doc """
Gets the type of an aggregate for a given resource.
"""
@spec aggregate_type(Spark.Dsl.t() | Ash.Resource.t(), Ash.Resource.Aggregate.t() | atom) ::
{:ok, Ash.Type.t()} | {:error, String.t()}
def aggregate_type(resource, aggregate) when is_atom(aggregate) do
aggregate_type(resource, aggregate(resource, aggregate))
end
def aggregate_type(resource, aggregate) do
attribute_type =
if aggregate.field do
related = Ash.Resource.Info.related(resource, aggregate.relationship_path)
Ash.Resource.Info.attribute(related, aggregate.field).type
end
Ash.Query.Aggregate.kind_to_type(aggregate.kind, attribute_type)
end
@doc "Returns all aggregates of a resource"
@spec aggregates(Spark.Dsl.t() | Ash.Resource.t()) :: list(Ash.Resource.Aggregate.t())
def aggregates(resource) do
Extension.get_entities(resource, [:aggregates])
end
@doc "Get an aggregate by name"
@spec aggregate(Spark.Dsl.t() | Ash.Resource.t(), atom | String.t()) ::
Ash.Resource.Aggregate.t() | nil
def aggregate(resource, name) when is_binary(name) do
resource
|> aggregates()
|> Enum.find(&(to_string(&1.name) == name))
end
def aggregate(resource, name) do
resource
|> aggregates()
|> Enum.find(&(&1.name == name))
end
@doc "Returns all public aggregates of a resource"
@spec public_aggregates(Spark.Dsl.t() | Ash.Resource.t()) :: list(Ash.Resource.Aggregate.t())
def public_aggregates(resource) do
resource
|> Extension.get_entities([:aggregates])
|> Enum.reject(& &1.private?)
end
@doc "Get an aggregate by name"
@spec public_aggregate(Spark.Dsl.t() | Ash.Resource.t(), atom | String.t()) ::
Ash.Resource.Aggregate.t() | nil
def public_aggregate(resource, name) when is_binary(name) do
resource
|> aggregates()
|> Enum.find(&(to_string(&1.name) == name && !&1.private?))
end
def public_aggregate(resource, name) do
resource
|> aggregates()
|> Enum.find(&(&1.name == name && !&1.private?))
end
@doc "Returns the primary action of the given type"
@spec primary_action!(Spark.Dsl.t() | Ash.Resource.t(), Ash.Resource.Actions.action_type()) ::
Ash.Resource.Actions.action() | no_return
def primary_action!(resource, type) do
case primary_action(resource, type) do
nil ->
raise "Required primary #{type} action for #{inspect(Extension.get_persisted(resource, :module))}."
action ->
action
end
end
@doc "Returns the primary action of a given type"
@spec primary_action(Spark.Dsl.t() | Ash.Resource.t(), Ash.Resource.Actions.action_type()) ::
Ash.Resource.Actions.action() | nil
def primary_action(resource, type) do
resource
|> actions()
|> Enum.find(&(&1.type == type && &1.primary?))
end
@doc "Returns the configured default actions"
@spec default_actions(Spark.Dsl.t() | Ash.Resource.t()) ::
list(:create | :read | :update | :destroy)
def default_actions(resource) do
default =
if embedded?(resource) do
[:create, :read, :update, :destroy]
|> Enum.reject(&Ash.Resource.Info.action(resource, &1))
else
[]
end
Extension.get_opt(
resource,
[:actions],
:defaults,
default
)
end
@doc "Returns all actions of a resource"
@spec actions(Spark.Dsl.t() | Ash.Resource.t()) :: [Ash.Resource.Actions.action()]
def actions(resource) do
Extension.get_entities(resource, [:actions])
end
@doc "Returns the action with the matching name and type on the resource"
@spec action(Spark.Dsl.t() | Ash.Resource.t(), atom(), Ash.Resource.Actions.action_type() | nil) ::
Ash.Resource.Actions.action() | nil
def action(resource, name, type \\ nil) do
# We used to need type, but we don't anymore since action names are unique
if type do
resource
|> actions()
|> Enum.find(&(&1.name == name))
|> case do
nil ->
nil
%{type: ^type} = action ->
action
%{type: found_type} ->
raise ArgumentError, """
Found an action of type #{found_type} while looking for an action of type #{type}
Perhaps you passed a changeset with the incorrect action type into your Api?
"""
end
else
resource
|> actions()
|> Enum.find(&(&1.name == name))
end
end
@doc "Returns all attributes of a resource"
@spec attributes(Spark.Dsl.t() | Ash.Resource.t()) :: [Ash.Resource.Attribute.t()]
def attributes(resource) do
Extension.get_entities(resource, [:attributes])
end
@doc "Get an attribute name from the resource"
@spec attribute(Spark.Dsl.t() | Ash.Resource.t(), String.t() | atom) ::
Ash.Resource.Attribute.t() | nil
def attribute(resource, name) when is_binary(name) do
resource
|> attributes()
|> Enum.find(&(to_string(&1.name) == name))
end
def attribute(resource, name) do
resource
|> attributes()
|> Enum.find(&(&1.name == name))
end
@doc "Returns all public attributes of a resource"
@spec public_attributes(Spark.Dsl.t() | Ash.Resource.t()) :: [Ash.Resource.Attribute.t()]
def public_attributes(resource) do
resource
|> attributes()
|> Enum.reject(& &1.private?)
end
@doc "Get a public attribute name from the resource"
@spec public_attribute(Spark.Dsl.t() | Ash.Resource.t(), String.t() | atom) ::
Ash.Resource.Attribute.t() | nil
def public_attribute(resource, name) when is_binary(name) do
resource
|> attributes()
|> Enum.find(&(to_string(&1.name) == name && !&1.private?))
end
def public_attribute(resource, name) do
resource
|> attributes()
|> Enum.find(&(&1.name == name && !&1.private?))
end
@spec related(Spark.Dsl.t() | Ash.Resource.t(), atom() | String.t() | [atom() | String.t()]) ::
Ash.Resource.t() | nil
def related(resource, relationship) when not is_list(relationship) do
related(resource, [relationship])
end
def related(resource, []), do: resource
def related(resource, [path | rest]) do
case relationship(resource, path) do
%{destination: destination} -> related(destination, rest)
nil -> nil
end
end
@doc "Get a field from a resource by name"
@spec field(Spark.Dsl.t() | Ash.Resource.t(), String.t() | atom) ::
Ash.Resource.Attribute.t()
| Ash.Resource.Aggregate.t()
| Ash.Resource.Calculation.t()
| Ash.Resource.Relationships.relationship()
| nil
def field(resource, name),
do:
attribute(resource, name) ||
aggregate(resource, name) ||
calculation(resource, name) ||
relationship(resource, name)
@doc "Get a public field from a resource by name"
@spec public_field(Spark.Dsl.t() | Ash.Resource.t(), String.t() | atom) ::
Ash.Resource.Attribute.t()
| Ash.Resource.Aggregate.t()
| Ash.Resource.Calculation.t()
| Ash.Resource.Relationships.relationship()
| nil
def public_field(resource, name),
do:
public_attribute(resource, name) ||
public_aggregate(resource, name) ||
public_calculation(resource, name) ||
public_relationship(resource, name)
@doc "Determine if a field is sortable by name"
@spec sortable?(Spark.Dsl.t() | Ash.Resource.t(), String.t() | atom,
pagination_type: Ash.Page.type(),
include_private?: boolean()
) ::
boolean()
def sortable?(resource, name, opts \\ []) do
pagination_type = Keyword.get(opts, :pagination_type, :offset)
include_private? = Keyword.get(opts, :include_private?, true)
field = if include_private?, do: field(resource, name), else: public_field(resource, name)
case field do
nil ->
false
%{type: {:array, _}} ->
false
%{type: Ash.Type.Map} ->
false
%Ash.Resource.Relationships.BelongsTo{} ->
false
%Ash.Resource.Relationships.HasOne{} ->
false
%Ash.Resource.Relationships.HasMany{} ->
false
%Ash.Resource.Relationships.ManyToMany{} ->
false
%Ash.Resource.Calculation{calculation: {module, _}} ->
Code.ensure_compiled(module)
:erlang.function_exported(module, :expression, 2) && pagination_type == :offset
%Ash.Resource.Calculation{} ->
false
%Ash.Resource.Aggregate{kind: :first, relationship_path: relationship_path} = aggregate ->
related = related(resource, relationship_path)
sortable?(related, aggregate.field) && pagination_type == :offset
%Ash.Resource.Aggregate{} ->
pagination_type == :offset
_ ->
true
end
end
end
