Module: Moribus::Extensions::DelegateAssociated

Extended by:
ActiveSupport::Concern
Defined in:
lib/moribus/extensions/delegate_associated.rb

Overview

This module is included by the class on the first call to delegate_associated method. When included, it will add classes_delegating_to class attribute to memorize classes of delegated associations. This information will be used for multi-parameter attributes assignment.

Instance Method Summary collapse

Instance Method Details

#column_for_attribute(name) ⇒ Object

Overloaded AR::Base method that will additionally check column in delegated associations classes. Purpose:

class Customer < ActiveRecord::Base
  has_one_current :customer_info

  delegate_associated :date_of_birth, :to => :customer_info
end

customer = Customer.new({
  'date_of_birth(1i)' => '1950',
  'date_of_birth(2i)' => '03',
  'date_of_birth(3i)' => '18'
})

Here, for multi-parameter attribute assignment, Rails will try to get the column class of ‘date_of_birth’ attribute. Since it is not presented in Customer, the code will result in exception without the following hook:



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# File 'lib/moribus/extensions/delegate_associated.rb', line 35

def column_for_attribute(name)
  unless (column = super).nil?
    return column
  end

  self.class.classes_delegating_to.each do |klass|
    column = klass.columns_hash[name.to_s]
    return column unless column.nil?
  end
  nil
end