We're going to adapt our KbArticle model so that new articles will be listed in the activity stream of any project with a knowledgebase.

In Chapter 5, Making Models Searchable, we introduced the acts_as_event plugin as a prerequisite to use the acts_as_searchable plugin; it also serves as a prerequisite for acts_as_activity_provider.

If we implement acts_as_activity_provider without acts_as_event and try to load an activity stream, Redmine will crash with a NoMethodError exception:

NoMethodError (undefined method `event_datetime' for #<KbArticle:0x000000042b9428>)

The example we provided in the previous chapter is being cited here for continuity:

class KbArticle < ActiveRecord::Base
  # ...
  
  acts_as_event :datetime    => :updated_at,
                :description => :summary,
                :title => Proc.new { |o| "#{l(:label_title_articles)} ##{o.id} - #{o.title}" },
                :url   => Proc.new { |o| { :controller => 'articles', 
     ...