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Module: ActiveRecord::Associations::ForeignAssociation

Do not use. This module is for internal use only.
Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In:
HasManyAssociation, HasManyThroughAssociation, HasOneAssociation, HasOneThroughAssociation
Defined in: activerecord/lib/active_record/associations/foreign_association.rb

Instance Attribute Summary

Instance Method Summary

Instance Attribute Details

#foreign_key_present? ⇒ Boolean (readonly)

[ GitHub ] 

  


# File 'activerecord/lib/active_record/associations/foreign_association.rb', line 5



def foreign_key_present?
  if reflection.klass.primary_key
    owner.attribute_present?(reflection.active_record_primary_key)
  else
    false
  end
end


  







Instance Method Details



  

    #nullified_owner_attributes  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/foreign_association.rb', line 13



def nullified_owner_attributes
  Hash.new.tap do |attrs|
    Array(reflection.foreign_key).each { |foreign_key| attrs[foreign_key] = nil }
    attrs[reflection.type] = nil if reflection.type.present?
  end
end


  








  

    #set_owner_attributes(record)   (private)
  



  

    

Sets the owner attributes on the given record


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/foreign_association.rb', line 22



def set_owner_attributes(record)
  return if options[:through]

  primary_key_attribute_names = Array(reflection.join_primary_key)
  foreign_key_attribute_names = Array(reflection.join_foreign_key)

  primary_key_foreign_key_pairs = primary_key_attribute_names.zip(foreign_key_attribute_names)

  primary_key_foreign_key_pairs.each do |primary_key, foreign_key|
    value = owner._read_attribute(foreign_key)
    record._write_attribute(primary_key, value)
  end

  if reflection.type
    record._write_attribute(reflection.type, owner.class.polymorphic_name)
  end
end