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# frozen_string_literal: true
module ActiveRecord::Associations::Builder # :nodoc:
class BelongsTo < SingularAssociation #:nodoc:
def self.macro
:belongs_to
end
def self.valid_options(options)
super + [:polymorphic, :touch, :counter_cache, :optional, :default]
end
def self.valid_dependent_options
[:destroy, :delete]
end
def self.define_callbacks(model, reflection)
super
add_counter_cache_callbacks(model, reflection) if reflection.options[:counter_cache]
add_touch_callbacks(model, reflection) if reflection.options[:touch]
add_default_callbacks(model, reflection) if reflection.options[:default]
end
def self.define_accessors(mixin, reflection)
super
add_counter_cache_methods mixin
end
def self.add_counter_cache_methods(mixin)
return if mixin.method_defined? :belongs_to_counter_cache_after_update
mixin.class_eval do
def belongs_to_counter_cache_after_update(reflection)
foreign_key = reflection.foreign_key
cache_column = reflection.counter_cache_column
if (@_after_create_counter_called ||= false)
@_after_create_counter_called = false
elsif (@_after_replace_counter_called ||= false)
@_after_replace_counter_called = false
elsif saved_change_to_attribute?(foreign_key) && !new_record?
if reflection.polymorphic?
model = attribute_in_database(reflection.foreign_type).try(:constantize)
model_was = attribute_before_last_save(reflection.foreign_type).try(:constantize)
else
model = reflection.klass
model_was = reflection.klass
end
foreign_key_was = attribute_before_last_save foreign_key
foreign_key = attribute_in_database foreign_key
if foreign_key && model.respond_to?(:increment_counter)
model.increment_counter(cache_column, foreign_key)
end
if foreign_key_was && model_was.respond_to?(:decrement_counter)
model_was.decrement_counter(cache_column, foreign_key_was)
end
end
end
end
end
def self.add_counter_cache_callbacks(model, reflection)
cache_column = reflection.counter_cache_column
model.after_update lambda { |record|
record.belongs_to_counter_cache_after_update(reflection)
}
klass = reflection.class_name.safe_constantize
klass.attr_readonly cache_column if klass && klass.respond_to?(:attr_readonly)
end
def self.touch_record(o, changes, foreign_key, name, touch, touch_method) # :nodoc:
old_foreign_id = changes[foreign_key] && changes[foreign_key].first
if old_foreign_id
association = o.association(name)
reflection = association.reflection
if reflection.polymorphic?
foreign_type = reflection.foreign_type
klass = changes[foreign_type] && changes[foreign_type].first || o.public_send(foreign_type)
klass = klass.constantize
else
klass = association.klass
end
old_record = klass.find_by(klass.primary_key => old_foreign_id)
if old_record
if touch != true
old_record.send(touch_method, touch)
else
old_record.send(touch_method)
end
end
end
record = o.send name
if record && record.persisted?
if touch != true
record.send(touch_method, touch)
else
record.send(touch_method)
end
end
end
def self.add_touch_callbacks(model, reflection)
foreign_key = reflection.foreign_key
n = reflection.name
touch = reflection.options[:touch]
callback = lambda { |changes_method| lambda { |record|
BelongsTo.touch_record(record, record.send(changes_method), foreign_key, n, touch, belongs_to_touch_method)
}}
model.after_save callback.(:saved_changes), if: :saved_changes?
model.after_touch callback.(:changes_to_save)
model.after_destroy callback.(:changes_to_save)
end
def self.add_default_callbacks(model, reflection)
model.before_validation lambda { |o|
o.association(reflection.name).default(&reflection.options[:default])
}
end
def self.add_destroy_callbacks(model, reflection)
model.after_destroy lambda { |o| o.association(reflection.name).handle_dependency }
end
def self.define_validations(model, reflection)
if reflection.options.key?(:required)
reflection.options[:optional] = !reflection.options.delete(:required)
end
if reflection.options[:optional].nil?
required = model.belongs_to_required_by_default
else
required = !reflection.options[:optional]
end
super
if required
model.validates_presence_of reflection.name, message: :required
end
end
end
end
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