Grape Hal

A ruby gem which adds HAL support to ruby Grape Api.

HAL is a simple format that gives a consistent and easy way to hyperlink between resources in your API. See HAL (Hyperlink Application Language)

github: ruby grape api

Install the gem by:

gem install grape-hal

Or add the gem to your Gemfile

gem 'grape-hal'

Use it in code by

require 'grape/hal'

If you want to add Hal response to your exist Grape Api, just simply include Grape::Hal and then use the dsl to describe your Apis.

Here are some Grape Apis. Note the include Grape::Hal and hal_for block.

require 'grape/hal'

class FooApi < ::Grape::API
  desc 'foo api description', rel: 'foo api'
  get '/foo_path/'
end

class SubApi < ::Grape::API
  desc 'bar api description with {param}', rel: 'bar api'
  get 'bar_path/:param'

  desc 'qux api description', rel: 'qux api'
  get 'qux_path'
end

class BazApi < ::Grape::API

  include Grape::Hal

  mount FooApi
  mount SubApi

  hal_for '/' do
    hal_for '/sub', rel: 'sub', title: 'a sub api module' do
      mount SubApi
    end
    mount FooApi
  end

end

After this, when a http request to specific path with json format accept headers.

GET / HTTP/1.1
Accept: application/hal+json, application/json, */*; q=0.01

grape/hal will response with the Hal data for you.

HTTP/1.1 200 OK
Content-Type: application/hal+json

{
  "_links": {
    "self": {
      "href": "/"
    },
    "sub": {
      "href": "/sub",
      "title": "a sub api module"
    },
    "foo api": {
      "href": "/foo_path",
      "title": "foo api description"
    }
  }
}

Feng Zhichao flankerfc(at)gmail.com