Module: AuditTrail::ChangeTracking::ClassMethods

Defined in:
lib/audit_trail/change_tracking.rb

Instance Method Summary collapse

Instance Method Details

#audit_trail_for(*attrs) ⇒ Object 



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# File 'lib/audit_trail/change_tracking.rb', line 11

def audit_trail_for(*attrs)
  options                = attrs.extract_options!
  callback_event         = options.delete(:on) || :save
  additional_info_method = options.delete(:additional_info)
  if_method              = options.delete(:if)

  attrs.each do |attr|
    callback_method_name = :"record_change_event_for_#{attr}"
    tracked_column_type = self.columns.find { |column| column.name.to_s == attr.to_s }.type
    self.audit_trail_types[attr.to_s] = tracked_column_type
    
    if additional_info_method
      define_method :"#{attr}_change_additional_info" do
        if additional_info_method.is_a?(Symbol)
          send(additional_info_method)
        elsif additional_info_method.respond_to?(:call)
          additional_info_method.call(self)
        end
      end
    end

    define_method callback_method_name do
      return unless send(:"#{attr}_changed?")
      change       = send(:"#{attr}_change")

      change_event_attrs   = {
        :changed_object     => self,
        :changed_attribute  => attr,
        :changed_by_id      => ChangeEvent.changer.try(:id),
        :changer_ip_address => ChangeEvent.changer_ip_address,
        
      }
      
      change_event_attrs[:additional_info] = send(:"#{attr}_change_additional_info") if additional_info_method
      change_event_attrs["previous_#{tracked_column_type}_value"] = change.first
      change_event_attrs["#{tracked_column_type}_value"]          = change.last
      change_event = ChangeEvent.new(change_event_attrs)
      change_event.save!
    end
    
    send(:"after_#{callback_event}", callback_method_name, :if => if_method)

    has_many :"#{attr}_change_events",
      :dependent  => :destroy,
      :class_name => "ChangeEvent",
      :as         => :changed_object,
      :order      => "change_events.created_at DESC, change_events.id DESC",
      :conditions => "change_events.changed_attribute = '#{attr}'"

  end
end