RailsHttpOptions

Simple gem that allows you to handle HTTP OPTIONS in Rails. Ideal for API introspection, like fetching request/response schemas and other meaningful for the client information.

Add this line to your application's Gemfile:

gem 'rails_http_options'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rails_http_options

Include RailsHttpOptions in your application controller. Then add a Rails route in your routes.rb denoting that you want to handle all HTTP OPTIONS in option method, defined by this gem.

  match '*path', {
    controller: 'application',
    action: 'options',
    constraints: { method: 'OPTIONS' },
    via: [:options]
  }

Then in any of your resource-based controller, add your options response:

  class Api::V1::UsersController < ApplicationController
    options do
      {
        schemas: {
          accepts: Company.json_schema,
          returns: Company.json_schema
        },
        meta: { max_per_page: 100 }
      }
    end
  end

You can also respond differently depending on request information.

Specifically, you get route details param coming from Rails routing mechanism and it's a simple hash. However, you have access to the regular request/response context inside the block, because just before is being called its context is changed to a controller's method, defined by this gem. Hence, you can access request, response, params etc, like a regular controller method.

  class Api::V1::UsersController < ApplicationController
    options do |route_details|
      if route_details[:id] #member route
        {
          schemas: { #params is available through context switching
            accepts: Company.find(params[:id]).introspection_schema,
            returns: Company.find(params[:id]).introspection_schema,
          }
        }
      else #collection route
        {
          schemas: {
            returns: [Company.introspection_schema]
          },
          meta: { max_per_page: 100 }
        }
      end
    end
  end

The response is always in JSON, but if you need something else (like yaml or XML), you can always override the default options method.

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/kollegorna/rails_http_options.