API Docs

A tool to help you generate documentation for your API using integration tests in Rails 3.

Installation

Add gem definition to your Gemfile and bundle install:

gem 'api_docs'

To access generated docs mount it to a path in your routes.rb like this:

mount ApiDocs::Engine => '/api-docs'

You may also want to add js/css to your asset pipeline manifests:

require api_docs

Documents view is made to work with Twitter Bootstrap css and js libraries.

Generating Api Docs

Documentation is automatically generated into yaml files from tests you create to test your api controllers. To start, let's create integration test by running rails g integration_test users. This will create a file for you to work with. Here's a simple test we can do:

class UsersTest < ActionDispatch::IntegrationTest
  def test_get_user
    user = users(:default)
    api_call(:get, '/users/:id', :id => user.to_param) do |doc|
      assert_response :success
      assert_equal ({
        'id'    => user.id,
        'name'  => user.name
      }), JSON.parse(response.body)
    end
  end

  def test_get_user_failure
    api_call(:get, '/users/:id', :id => 'invalid') do |doc|
      doc.description = 'When bad user id is passed'
      assert_response :not_found
      assert_equal ({
        'message' => 'User not found'
      }), JSON.parse(response.body)
    end
  end
end

Assuming that tests pass their details are doing to be recorded into docs/api/users.yml and they will look like this:

show:
  ID-f385895c2c5265b8a84d19b9885eebe0:
    method: GET
    path: /users/:id
    params:
      id: 12345
    status: 200
    body:
      id: 12345
      name: John Doe
  ID-3691338c8b1f567ec48e0e2ebdba2e0d:
    description: When bad user id is passed
    method: GET
    path: /users/:id
    params:
      id: invalid
    status: 404
    body:
      message: User not found

Usage

Just navigate to the path you mounted api_docs to. Perhaps http://yourapp/api-docs.

Configuration

You can change the default configuration of this gem by adding the following code to your initializers folder:

ApiDocs.configure do |config|
  # folder path where api docs are saved to
  config.docs_path = Rails.root.join('doc/api')

  # controller that ApiDocs controller inherits from.
  # Useful for hiding it behind admin controller.
  config.base_controller = 'ApplicationController'

  # Remove doc files before running tests. False by default.
  config.reload_docs_folder = false
end

Api Docs Example