Controller hooks

Controller hooks allow custom functionality to be injected into an existing process. A normal use-case for this type of hook is to perform some custom validation on the context object provided to the callback.

In /path/to/redmine/app/models/issue.rb, there is a hook registered for controller_issues_edit_before_save. In order to take advantage of this hook, we would have to provide our own callback function. This can be done as follows:

module Knowledgebase
  module Hooks
    class ControllerIssuesEditBeforeSaveHook < Redmine::Hook::ViewListener
      def controller_issues_edit_before_save(context={})
        if context[:params] && context[:params][:issue]
          if User.current.allowed_to?(:assign_article_to_issue, context[:issue].project)
            if context[:params][:issue][:article_id].present?
              article = KbArticle.find_by_id(context[:params][:issue][:article_id])
              if article.category.project == context[:issue].project
       ...