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module ActiveRecord::Associations::Builder
class BelongsTo < SingularAssociation #:nodoc:
def macro
:belongs_to
end
def valid_options
super + [:foreign_type, :polymorphic, :touch]
end
def constructable?
!options[:polymorphic]
end
def build
reflection = super
add_counter_cache_callbacks(reflection) if options[:counter_cache]
add_touch_callbacks(reflection) if options[:touch]
reflection
end
def add_counter_cache_callbacks(reflection)
cache_column = reflection.counter_cache_column
foreign_key = reflection.foreign_key
mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
def belongs_to_counter_cache_after_create_for_#{name}
if record = #{name}
record.class.increment_counter(:#{cache_column}, record.id)
@_after_create_counter_called = true
end
end
def belongs_to_counter_cache_before_destroy_for_#{name}
unless destroyed_by_association && destroyed_by_association.foreign_key.to_sym == #{foreign_key.to_sym.inspect}
record = #{name}
record.class.decrement_counter(:#{cache_column}, record.id) unless record.nil?
end
end
def belongs_to_counter_cache_after_update_for_#{name}
if (@_after_create_counter_called ||= false)
@_after_create_counter_called = false
elsif self.#{foreign_key}_changed? && !new_record? && defined?(#{name.to_s.camelize})
model = #{name.to_s.camelize}
foreign_key_was = self.#{foreign_key}_was
foreign_key = self.#{foreign_key}
if foreign_key && model.respond_to?(:increment_counter)
model.increment_counter(:#{cache_column}, foreign_key)
end
if foreign_key_was && model.respond_to?(:decrement_counter)
model.decrement_counter(:#{cache_column}, foreign_key_was)
end
end
end
CODE
model.after_create "belongs_to_counter_cache_after_create_for_#{name}"
model.before_destroy "belongs_to_counter_cache_before_destroy_for_#{name}"
model.after_update "belongs_to_counter_cache_after_update_for_#{name}"
klass = reflection.class_name.safe_constantize
klass.attr_readonly cache_column if klass && klass.respond_to?(:attr_readonly)
end
def add_touch_callbacks(reflection)
mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
def belongs_to_touch_after_save_or_destroy_for_#{name}
foreign_key_field = #{reflection.foreign_key.inspect}
old_foreign_id = attribute_was(foreign_key_field)
if old_foreign_id
klass = association(#{name.inspect}).klass
old_record = klass.find_by(klass.primary_key => old_foreign_id)
if old_record
old_record.touch #{options[:touch].inspect if options[:touch] != true}
end
end
record = #{name}
unless record.nil? || record.new_record?
record.touch #{options[:touch].inspect if options[:touch] != true}
end
end
CODE
model.after_save "belongs_to_touch_after_save_or_destroy_for_#{name}"
model.after_touch "belongs_to_touch_after_save_or_destroy_for_#{name}"
model.after_destroy "belongs_to_touch_after_save_or_destroy_for_#{name}"
end
def valid_dependent_options
[:destroy, :delete]
end
end
end
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