iLeonux

Suppose to make a plugin named ‘acts_as_user_owned’, which will make the column ‘created_by’ as the foreign key to User model ( and updated_by ).

You can make it as the official way:
start from: ruby script/generate plugin acts_as_user_owned
or
just make a file ‘acts_as_user_owned.rb’ into lib.

Then edit vender/plugin/acts_as_user_owned/lib/acts_as_user_owned.rb (or lib/acts_as_user_owned.rb) :

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module ActsAsUserOwned
  def acts_as_user_owned
    belongs_to :creator, :foreign_key => "created_by", :class_name => "User"
    belongs_to :updator, :foreign_key => "updated_by", :class_name => "User"
 
    User.class_eval "has_many: #{self.to_s.tableize}, :foreign_key => :created_by"
  end
end

To inject this method into each model, write the following two lines into vender/plugin/acts_as_user_owned/init.rb (or append to lib/acts_as_user_owned.rb):

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require 'acts_as_user_owned'
ActiveRecord::Base.extend ActsAsUserOwned

Usage: just add ‘acts_as_user_owned’ to the model you want it acts as user owned.

Done, enjoy it!