Hi,

with our Rails plugins hooks, you can patch the OpenProject core by simply extending modules within a plugin due to Ruby's metaprogramming.

See the following easy example: The Documents plugin patches the Project class  with the following code:

module OpenProject::Documents::Patches
  module ProjectPatch
    def self.included(base)
      base.class_eval do

        has_many :documents, dependent: :destroy
      end
    end
  end
end

Project.send(:include, OpenProject::Documents::Patches::ProjectPatch)

Source: https://github.com/opf/openproject/blob/dev/modules/documents/lib/open_project/documents/patches/project_patch.rb

This patch is registered at the engine of the plugin here: https://github.com/opf/openproject/blob/dev/modules/documents/lib/open_project/documents/engine.rb#L65

Best,

Oliver

thank you, I have successfully implement the associations following your guide. However, i'm having a new problem. I want use Action Mailer to send email to user if the Service Pack has expired. I have generate the ServicePackMailer following rails guide but I can not preview the ServicePackMailer when I start the OP. It said the mailer not found. The same after I try re-bundle install. Do I have to register something in the engine file like the last problem?

This patch is registered at the engine of the plugin here: https://github.com/opf/openproject/blob/dev/modules/documents/lib/open_project/documents/engine.rb#L65 uno online

This is what I am looking for, Thanks for sharing it.