Adding class/instance methods meta-programmatically through ActiveSupport::Concern

gistfile1.rb

#Solution was probably too much overhead for the problem I had at hand - but it was fun.
#Note: This gist assumes Rails.
 
module Concerns
  module LinkedAccountable
    extend ActiveSupport::Concern
    
    ACCOUNT_TYPES = ["twitter", "google"]
  
    def self.included(obj)
      obj.has_many :linked_accounts, :dependent => :destroy        
    end
    
    ACCOUNT_TYPES.each do |account_type|
      account_bool = ((account_type + "?").to_sym)
      find_by_account_type_id = ("find_by_" + account_type + '_id').to_sym
      account_id = (account_type + "_id").to_sym
      account_type_users = (account_type + "_" + self.class.to_s.downcase.pluralize).to_sym
      account = account_type.to_sym          
      
      ### User.first.google?
      define_method account_bool do 
        self.linked_accounts.send(account).any?
      end
  
      ### User.first.google        
      define_method account_type.to_sym do 
        self.send(account_bool) ? self.linked_accounts.send(account).first : nil
      end
  
      ### User.first.google_id
      define_method account_id do
         self.send(account_bool) ? self.send(account).source_id : nil
      end
 
      ### User.find_by_twitter_id("aggressive_panda")        
      self.class.send(:define_method, find_by_account_type_id) do |id|
        belongs_to_assoc = self.to_s.downcase.to_sym
        linked_account = LinkedAccount.includes(belongs_to_assoc).send(account).find_by(source_id: id)
        linked_account.nil? ? nil : linked_account.send(belongs_to_assoc)
      end 
              
    end
  end
end