Grape - 擁有REST風格API的Ruby框架

Grape是一個擁有類似REST API的Ruby微型框架。它設計運行在Rack或補充現有Web應用框架如Rails或Sinatra，提供一種簡單DSL來簡化RESTful APIs開發。它已經內置支持一些常見約束，包括multiple formats, subdomain/prefix restriction, content negotiation, versioning等。下面是基本的用法：

class 推ter::API < Grape::API
  version 'v1', :using => :header, :vendor => '推ter'
  format :json

  helpers do
    def current_user
      @current_user ||= User.authorize!(env)
    end

    def authenticate!
      error!('401 Unauthorized', 401) unless current_user
    end
  end

  resource :statuses do

    desc "Return a public timeline."
    get :public_timeline do
      Status.limit(20)
    end

    desc "Return a personal timeline."
    get :home_timeline do
      authenticate!
      current_user.statuses.limit(20)
    end

    desc "Return a status."
    params do
      requires :id, :type => Integer, :desc => "Status id."
    end
    get ':id' do
      Status.find(params[:id])
    end

    desc "Create a status."
    params do
      requires :status, :type => String, :desc => "Your status."
    end
    post do
      authenticate!
      Status.create!({
        :user => current_user,
        :text => params[:status]
      })
    end

    desc "Update a status."
    params do
      requires :id, :type => String, :desc => "Status ID."
      requires :status, :type => String, :desc => "Your status."
    end
    put ':id' do
      authenticate!
      current_user.statuses.find(params[:id]).update({
        :user => current_user,
        :text => params[:status]
      })
    end

    desc "Delete a status."
    params do
      requires :id, :type => String, :desc => "Status ID."
    end
    delete ':id' do
      authenticate!
      current_user.statuses.find(params[:id]).destroy
    end

  end

end

項目主頁：http://www.baiduhome.net/lib/view/home/1356229655416