[](https://github.com/byjord/MapRewire)
[](https://travis-ci.org/byjord/MapRewire)
[](https://coveralls.io/github/byjord/MapRewire)
[](https://libraries.io/hex/map_rewire)
Bulk rekey your maps. Simple shit bud. (☞ﾟ ヮ ﾟ)☞
- [Why did I do this?](#why-did-i-do-this)
- [TL;DR; Syntax](#tl-dr--syntax)
* [Getting started](#getting-started)
- [1. Add as a dependency](#1-add-as-a-dependency)
- [2. Download](#2-download)
- [3 (Optionally). Want to see inside MapRewire?](#3--optionally--want-to-see-inside-maprewire-)
- [4. Run!](#4-run-)
* [Usage](#usage)
- [Running in iex](#running-in-iex)
+ [Inline example using a list transformation](#inline-example-using-a-list-transformation)
+ [Inline example using a string transformation](#inline-example-using-a-string-transformation)
+ [Mixed example with a string transformation](#mixed-example-with-a-string-transformation)
+ [Dynamic example with a string transformation](#dynamic-example-with-a-string-transformation)
+ [Dynamic example with a list transformation](#dynamic-example-with-a-list-transformation)
- [Running as part of a module](#running-as-part-of-a-module)
* [Contributors](#contributors)
### Why did I do this?
Simply because I am _super lazy_, and writing out functions to take maps and convert them to different keys was boring (and irritating) the shit out of me.
Stop writing `defp from_x_to_y(data), do: %{ "another_id" => data["id"], "name" => data["title"] }`.
### TL;DR; Syntax
1. Macro: `content<~>transformation`, content is your data, transformation is your rules.
2. Content: Any map. BYOD.
3. Transformation: `from=>to`. Left is the original key, right is the new key.
## Getting started
### 1. Add as a dependency
```elixir
def deps do
[
{:map_rewire, "~> 0.2.0"}
]
end
```
### 2. Download
```bash
$ mix deps.get
```
### 3 (Optionally). Want to see inside MapRewire?
Add to config.exs
```elixir
config :map_rewire,
debug?: true
```
### 4. Run!
```bash
$ iex -S mix
```
## Usage
### Running in iex
#### Inline example using a list transformation
```elixir
iex(1)> use MapRewire
iex(2)> %{"id"=>"234923409", "title"=>"asdf"}<~>["title=>name", "id=>shopify_id"]
[
%{"id" => "234923409", "title" => "asdf"},
%{"shopify_id" => "234923409", "name" => "asdf"}
]
```
#### Inline example using a string transformation
```elixir
iex(1)> use MapRewire
iex(2)> %{"id"=>"234923409", "title"=>"asdf"}<~>"title=>name id=>shopify_id"
[
%{"id" => "234923409", "title" => "asdf"},
%{"shopify_id" => "234923409", "name" => "asdf"}
]
```
#### Mixed example with a string transformation
```elixir
iex(1)> use MapRewire
iex(2)> content = %{
"id"=>"234923409",
"title"=>"asdf",
"body_html"=>"asdf"
}
iex(3)> content<~>"title=>name id=>shopify_id body_html=>desc no_match=>wow_much_field"
[
%{"id" => "234923409", "title" => "asdf", "body_html" => "asdf"},
%{"shopify_id" => "234923409", "name" => "asdf", "desc" => "asdf"}
]
```
#### Dynamic example with a string transformation
```elixir
iex(1)> use MapRewire
iex(2)> content = %{
"id"=>"234923409",
"title"=>"asdf",
"body_html"=>"asdf"
}
iex(3)> transformation = "title=>name id=>shopify_id body_html=>desc no_match=>wow_much_field"
iex(4)> content<~>transformation
[
%{"id" => "234923409", "name" => "title", "body_html" => "asdf"},
%{"shopify_id" => "234923409", "name" => "asdf", "desc" => "asdf"}
]
```
#### Dynamic example with a list transformation
```elixir
iex(1)> use MapRewire
iex(2)> content = %{
"id"=>"234923409",
"title"=>"asdf",
"body_html"=>"asdf"
}
iex(3)> transformation = ["title=>name", "id=>shopify_id", "body_html=>desc"]
iex(4)> content<~>transformation
[
%{"id" => "234923409", "name" => "asdf", "body_html" => "asdf"},
%{"shopify_id" => "234923409", "name" => "asdf", "desc" => "asdf"}
]
```
### Running as part of a module
**Example 1:**
```elixir
defmodule Foo do
use MapRewire
@becomes [
"id=>shopify_id",
"title=>name",
"body_html=>description"
]
def bar do
fake_factory
|> final
end
defp fake_factory do
%{
"id" => "234923409",
"title" => "asdf",
"body_html" => "asdfasdf"
}
end
def final(data) do
data<~>@becomes
end
end
```
Calling `Foo.bar()` will result in the output:
```elixir
[
%{"id" => "234923409", "title" => "asdf", "body_html" => "asdfasdf"},
%{"shopify_id" => "234923409", "name" => "asdf", "description" => "asdfasdf"}
]
```
**Example 2:**
```elixir
defmodule Foo do
use MapRewire
@becomes "age=>years_old languages=>technologies_known name=>this"
def bar do
fake_factory
|> final
end
defp fake_factory do
%{
"age"=> 31,
"languages"=> ["Erlang", "Ruby", "Elixir"],
"name"=> "John"
}
end
def final(data) do
data<~>@becomes
end
end
```
Calling `Foo.bar()` will result in the output:
```elixir
[
%{"age" => 31, "languages" => ["Erlang", "Ruby", "Elixir"], "name" => "John"},
%{"years_old" => 31, "technologies_known" => ["Erlang", "Ruby", "Elixir"], "this" => "John"}
]
```
## Contributors
| [](https://github.com/byjord) | [](https://github.com/halostatue) |
| :-----------------------------------------------------------------------------------------------: | :-----------------------------------------------------------------------------------------------------: |
| [byjord](https://github.com/byjord) | [halostatue](https://github.com/halostatue) |
