升级到 Rails 6 后参数数量错误（给定 4，预期为 0..1）

Question

I just upgraded from Rails 5.2 to Rails 6 and I'm facing an issue in one class.

class Calculator < ApplicationRecord
  def initialize(obj, user_id, calc_type, will_id = nil )
    @inheritors = obj
    super_obj = obj.clone.merge!(user_id: user_id, type: calc_type, will_id: will_id)
    super(super_obj)
    @shares = {}
    @remains = RationalWithArgumentStore(0)
    @stop_residual_shares = false
    @special_case_apply = false
    @rules = {}
    @authorities = {}
  end
end

and I'm creating new instance of the class like the following

calc = Calculator.new(obj, user_id, calc_type, nil)

It through an error saying:

wrong number of arguments (given 4, expected 0..1)

I spent two days searching and trying to fix the issue without any luck. Your help is highly appreciated

Answer 1

This is happening because you are redefining initialize for a class that inherits from ApplicationRecord . It throws an error here . If you were to do the following it would work.

class Calculator
  def initialize(obj, user_id, calc_type, will_id = nil)
    @obj = obj
    @user_id = user_id
    @calc_type = calc_type
    @will_id = will_id
  end
end

Note that redefining initialize in this way is not recommended (see docs here ), so if you can I would look into callbacks and see if you can accomplish your goal with that.

Hope that helps.

Answer 2

(Rails 6.x) One of my models had include Rails.application.routes.url_helpers .

If you have the same problem, remove it and manage your url methods by calling it directly as:

def my_link_function
 # ... my code
 my_link = Rails.application.routes.url_helpers.url_for([my_params]))
 # ... other code
end