I am writing a plugin in redmine 1.4, and as a part of my project, I need to establish a one to many relation between a model created by me (ex: lms_users), and a model that is part of the Redmine core ('users'). I know that the usual way to create this relation is by using "belongs_to : user" inside the "LmsUser" model ,and a "has_many :users", inside the User, but this would involve modifying the core model "users", and it's out of discussion.
Is there any way to solve this problem, so there should not be anay dependency issues in core?