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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
mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
def belongs_to_counter_cache_after_create_for_#{name}
record = #{name}
record.class.increment_counter(:#{cache_column}, record.id) unless record.nil?
end
def belongs_to_counter_cache_before_destroy_for_#{name}
unless marked_for_destruction?
record = #{name}
record.class.decrement_counter(:#{cache_column}, record.id) unless record.nil?
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}"
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}
record = #{name}
unless record.nil?
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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