gistfile1.txt

[3] pry(#<UsersController>)> @user
=> #<User:0x007f1a899a1708 id: 3, name: "Bob", created_at: Thu, 08 Jan 2015 22:08:04 UTC +00:00, updated_at: Thu, 08 Jan 2015 22:08:04 UTC +00:00>
[4] pry(#<UsersController>)> render json: @user, only: ["id", "name"]
=> ["{\"id\":3,\"name\":\"Bob\"}"]
[5] pry(#<UsersController>)> self.response_body = nil
=> nil
[6] pry(#<UsersController>)> render json: @user, only: [:id, :name]
=> ["{\"id\":3,\"name\":\"Bob\"}"]
[7] pry(#<UsersController>)> Rails.version
=> "4.2.0"
[8] pry(#<UsersController>)> @user.to_json only: ["id", "name"]
=> "{\"id\":3,\"name\":\"Bob\"}"
[9] pry(#<UsersController>)> @user.to_json only: [:id, :name]
=> "{\"id\":3,\"name\":\"Bob\"}"