Rails控制器参数未定义

Question

I am trying to make a simple api on Rails. (v4.1.8) However, it seems like the parameters that I send never reach the controller. I always get:

undefined method `parameters' for nil:NilClass

The controller code is:

class API::V1::ServiceController < ApiBaseController
  def initialize
    puts 'OK. I am here.' # <---- I can get here without error.
    puts params.inspect # <---- Here is where the error occur.
    render json: {message: 'Test completed.'}
  end
end

ApiBaseController is nothing:

class ApiBaseController < ActionController::Base

end

Route:

namespace :api , :defaults => {:format => :json} do
  namespace :v1 do
    get 'initialize',       to: 'service#initialize'
  end
end

My test URL:

http://localhost:3000/api/v1/initialize?param1=one

Answer 1

This error is due to the use of initialize as an action name. In Ruby, initialize is a keyword, denoting the class constructor. In this case, params is getting called before the controller class is initialized, and hence the error.

Refer this for more information about the initialize keyword, and this list of all ruby keywords .