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https://github.com/sheharyarn/better_params

Cleaner request parameters in Elixir web applications 🙌
https://github.com/sheharyarn/better_params

elixir phoenix-framework plug request-handler

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Cleaner request parameters in Elixir web applications 🙌

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README 

        
[BetterParams][docs]

====================



[![Build Status][shield-travis]][travis-ci]

[![Coverage Status][shield-inch]][docs]

[![Version][shield-version]][hexpm]

[![License][shield-license]][hexpm]



> Cleaner request parameters in Elixir web applications 🙌



`BetterParams` is a simple Elixir [Plug][plug] that allows passed

request parameters to be called as `atoms` instead of Strings. The

sole purpose of this Plug is to pattern match on maps with atom keys

instead of string keys in routers/controllers to calm my OCD down.







## Usage



Once installed, it lets you pattern match request parameters like

`%{id: id}` instead of `%{"id" => id}` in Phoenix applications:



```elixir

# web/controllers/some_controller.ex



def show(conn, %{id: id}) do

  # do something

end



def create(conn, %{id: id, post: %{title: title, body: body}}) do

  # do something

end

```



#### Notes



 - Implementation uses [`String.to_existing_atom`][string-atom] to prevent

   against [DoS attacks][gh-issue-ddos], so it only converts those params

   to atoms that you use in your application.

 - You can continue to use String keys without breaking your existing

   matches if you want. All request parameters are available for both

   `String` and `Atom` keys (that have already been defined in the

   application).

 - This doesn't pollute your Request Logs with duplicate params.

 - For other `Plug.Router` based applications, you can also access request

   params similarly by calling them like `conn.params[:id]` or

  `conn.params.post.title`.







## Installation



Add `better_params` to your project dependencies in `mix.exs`:



```elixir

def deps do

  [{:better_params, "~> 0.5.0"}]

end

```



### Phoenix Framework



For Phoenix applications, call the plug at the end of the `controller`

method in `web/web.ex` (inside the `quote` block):



```elixir

# web/web.ex



def controller do

  quote do

    use Phoenix.Controller



    # Other stuff...



    plug BetterParams

  end

end

```



Alternatively, you can also call it your Router Pipelines or in

individual controllers directly.



### Other Plug.Router Apps



For other applications using `Plug.Router`, call the Plug anytime after

calling the `:match` and `:dispatch` plugs:



```elixir

defmodule MyApp.Router do

  use Plug.Router



  plug :match

  plug :dispatch

  plug BetterParams



  # Rest of the router...

end



```



### Removing String Keys Entirely



If your use case calls for a params object with _only_ `Atom` keys, you

may pass the option `drop_string_keys` to the plug. Much as it says on

the can, this will replace the `String`-type keys altogether, rather

than preserving them alongside the `Atom` keys.



```elixir

plug BetterParams, drop_string_keys: true

```







## Roadmap



 - [x] Write Tests

 - [x] Write Documentation

 - [x] Symbolize the collective `params` map

 - [x] Option to remove string keys entirely

 - [ ] Symbolize [individual parameter maps][plug-params] (if the need arises)

    - [ ] `path_params`

    - [ ] `body_params`

    - [ ] `query_params`







## Contributing



 - [Fork][github-fork], Enhance, Send PR

 - Lock issues with any bugs or feature requests

 - Implement something from Roadmap

 - Spread the word :heart:







## License



This package is available as open source under the terms of the [MIT License][license].







  [shield-version]:   https://img.shields.io/hexpm/v/better_params.svg

  [shield-license]:   https://img.shields.io/hexpm/l/better_params.svg

  [shield-downloads]: https://img.shields.io/hexpm/dt/better_params.svg

  [shield-travis]:    https://img.shields.io/travis/sheharyarn/better_params/master.svg

  [shield-inch]:      https://inch-ci.org/github/sheharyarn/better_params.svg?branch=master



  [travis-ci]:        https://travis-ci.org/sheharyarn/better_params

  [inch-ci]:          https://inch-ci.org/github/sheharyarn/better_params



  [license]:          https://opensource.org/licenses/MIT

  [hexpm]:            https://hex.pm/packages/better_params

  [plug]:             https://github.com/elixir-lang/plug

  [plug-params]:      https://hexdocs.pm/plug/Plug.Conn.html#module-fetchable-fields

  [string-atom]:      https://hexdocs.pm/elixir/String.html#to_existing_atom/1



  [docs]:             https://hexdocs.pm/better_params



  [github-fork]:      https://github.com/sheharyarn/better_params/fork

  [gh-issue-ddos]:    https://github.com/sheharyarn/better_params/issues/1