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# In Rails config/routes.rb

mount Twitter::API => "/"

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class CustomerAPI < Grape::API
  version 'v1', :using => :header

  resource :users do
    desc "Create a user"
    post :create do
      User.create!(params[:user]).to_json
    end
  end
end

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class CustomerAPI < Grape::API
  version 'v1', :using => :header

  resource :users do
    desc "Will Error!"
    post :silly do
      error("You're silly", 500)
    end

    desc "Smarter version of all Users"

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class CustomerAPI < Grape::API
  version 'v1', :using => :header

  rescue_from ActiveRecord::RecordInvalid do |e|
    # Precondition Failed
    error_response(:status => 412, :message => { :error => e.message }.to_json)
  end

  helpers do
    def authenticate!

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public class Challenge {
  public static void main(String[] args) throws Exception {
    Output.write(Input.read());
  }
}

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output << input

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public class Challenge {
  public static void Main() {
    Output.Write(Input.Read());
  }
}

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<?php
include 'support.php';
Output::Write(Input::Read());

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output += input;

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  has_many :performances, :dependent => :destroy

  has_many :keyword_vendor_instances,
           :class_name  => 'Scenario::Keyword::VendorInstance',
           :foreign_key => :ad_group_vendor_instance_id

  has_many :ad_vendor_instances,
           :class_name  => 'Scenario::Ad::VendorInstance',
           :foreign_key => :ad_group_vendor_instance_id