Overwrite a gem method by inserting a module in your inheritance chain

tl;tr;

• create a module and define the method
• include it after the gem
• check it by self.class.ancestors to see the inheritance chain (継承チェーン)

🤔 Situation

class PointsController < ApplicationController
  include MyModule
  include Banken

  def index
    banken_user #=> current_user 🤔
  end
end

module MyModule
  def banken_user
    # custom curent_user
  end
end

# gem
module Banken
  def banken_user
    current_user
  end
end

👍 解決

class PointsController < ApplicationController
+ include Banken
  include MyModule
- include Banken

  def index
    banken_user #=> custome current_user 👍
  end
end

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🔗 Parent Note

My Rails note

n350071🇯🇵 ・ Sep 11 '19 ・ 3 min read

#rails