Class: ActiveRecord::Associations::BelongsToAssociation

Inherits:
SingularAssociation show all
Defined in:
activerecord/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

#inversed, #owner, #reflection, #target

Instance Method Summary collapse

Methods inherited from SingularAssociation

#build, #force_reload_reader, #reader, #writer

Methods inherited from Association

#association_scope, #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, #stale_target?, #target_scope

Constructor Details

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

Instance Method Details

#decrement_counters ⇒ Object

:nodoc:



39
40
41
 
# File 'activerecord/lib/active_record/associations/belongs_to_association.rb', line 39

def decrement_counters # :nodoc:
  update_counters(-1)
end

#default(&block) ⇒ Object 



26
27
28
 
# File 'activerecord/lib/active_record/associations/belongs_to_association.rb', line 26

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

#handle_dependency ⇒ Object

:nodoc:



7
8
9
 
# File 'activerecord/lib/active_record/associations/belongs_to_association.rb', line 7

def handle_dependency
  target.send(options[:dependent]) if load_target
end

#increment_counters ⇒ Object

:nodoc:



43
44
45
 
# File 'activerecord/lib/active_record/associations/belongs_to_association.rb', line 43

def increment_counters # :nodoc:
  update_counters(1)
end

#replace(record) ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
# File 'activerecord/lib/active_record/associations/belongs_to_association.rb', line 11

def replace(record)
  if record
    raise_on_type_mismatch!(record)
    update_counters_on_replace(record)
    replace_keys(record)
    set_inverse_instance(record)
    @updated = true
  else
    decrement_counters
    remove_keys
  end

  self.target = record
end

#reset ⇒ Object 



30
31
32
33
 
# File 'activerecord/lib/active_record/associations/belongs_to_association.rb', line 30

def reset
  super
  @updated = false
end

#updated? ⇒ Boolean

Returns:

  • (Boolean) 


35
36
37
 
# File 'activerecord/lib/active_record/associations/belongs_to_association.rb', line 35

def updated?
  @updated
end