Class: ActiveRecord::Associations::BelongsToAssociation

Inherits:
SingularAssociation show all
Defined in:
lib/active_record/associations/belongs_to_association.rb

Overview

Active Record Belongs To Association

Direct Known Subclasses

BelongsToPolymorphicAssociation

Instance Attribute Summary

Attributes inherited from Association

#owner, #reflection, #target

Instance Method Summary collapse

Methods inherited from SingularAssociation

#build, #force_reload_reader, #reader, #writer

Methods inherited from Association

#create, #create!, #extensions, #initialize, #initialize_attributes, #klass, #load_target, #loaded!, #loaded?, #marshal_dump, #marshal_load, #reload, #remove_inverse_instance, #reset_scope, #scope, #set_inverse_instance, #set_inverse_instance_from_queries, #stale_target?

Constructor Details

This class inherits a constructor from ActiveRecord::Associations::Association

Instance Method Details

#decrement_counters ⇒ Object 



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# File 'lib/active_record/associations/belongs_to_association.rb', line 37

def decrement_counters
  update_counters(-1)
end

#decrement_counters_before_last_save ⇒ Object 



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# File 'lib/active_record/associations/belongs_to_association.rb', line 45

def decrement_counters_before_last_save
  if reflection.polymorphic?
    model_was = owner.attribute_before_last_save(reflection.foreign_type).try(:constantize)
  else
    model_was = klass
  end

  foreign_key_was = owner.attribute_before_last_save(reflection.foreign_key)

  if foreign_key_was && model_was < ActiveRecord::Base
    update_counters_via_scope(model_was, foreign_key_was, -1)
  end
end

#default(&block) ⇒ Object 



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# File 'lib/active_record/associations/belongs_to_association.rb', line 24

def default(&block)
  writer(owner.instance_exec(&block)) if reader.nil?
end

#handle_dependency ⇒ Object

:nodoc:



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# File 'lib/active_record/associations/belongs_to_association.rb', line 7

def handle_dependency
  return unless load_target

  case options[:dependent]
  when :destroy
    target.destroy
    raise ActiveRecord::Rollback unless target.destroyed?
  else
    target.send(options[:dependent])
  end
end

#increment_counters ⇒ Object 



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# File 'lib/active_record/associations/belongs_to_association.rb', line 41

def increment_counters
  update_counters(1)
end

#inversed_from(record) ⇒ Object 



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# File 'lib/active_record/associations/belongs_to_association.rb', line 19

def inversed_from(record)
  replace_keys(record)
  super
end

#reset ⇒ Object 



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# File 'lib/active_record/associations/belongs_to_association.rb', line 28

def reset
  super
  @updated = false
end

#target_changed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/associations/belongs_to_association.rb', line 59

def target_changed?
  owner.saved_change_to_attribute?(reflection.foreign_key)
end

#updated? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/associations/belongs_to_association.rb', line 33

def updated?
  @updated
end