module ActionPubsub::ActiveRecord::OnChange::ClassMethods
Public Instance Methods
on_change(*attribute_names, &block)
click to toggle source
# File lib/action_pubsub/active_record/on_change.rb, line 15 def on_change(*attribute_names, &block) options = attribute_names.extract_options! attribute_names.each do |attribute| @_on_change_watches[attribute] = { :block => block } @_on_change_watches[attribute].merge!(options) end on :changed do |record| record.previous_changes.each_pair do |k,vals| if self.class.react_to_changed?(record, k, vals) old_value, new_value = vals self.instance_exec(new_value, old_value, &self.class.watched_attributes[k][:block]) end end end end
react_to_changed?(resource, attribute_name, value)
click to toggle source
# File lib/action_pubsub/active_record/on_change.rb, line 33 def react_to_changed?(resource, attribute_name, value) old_value, new_value = value return false unless watching_attribute?(attribute_name) result = true result &&= old_value == watched_attributes[attribute_name][:from] if watched_attributes[attribute_name].key?(:from) result &&= new_value == watched_attributes[attribute_name][:to] if watched_attributes[attribute_name].key?(:to) result &&= watched_attributes[attribute_name][:if].call(resource) if watched_attributes[attribute_name].key?(:if) result &&= !watched_attributes[attribute_name][:unless].call(resource) if watched_attributes[attribute_name].key?(:unless) return result end
watched_attributes()
click to toggle source
# File lib/action_pubsub/active_record/on_change.rb, line 48 def watched_attributes self.instance_variable_get(:@_on_change_watches) end
watching_attribute?(attribute_name)
click to toggle source
# File lib/action_pubsub/active_record/on_change.rb, line 44 def watching_attribute?(attribute_name) watched_attributes.key?(attribute_name) end