title: Why do I get a nomethod error?
body: <p>I call this method in my controller:</p>
  
  <pre><code>delete_heard_timeline_event(current_user.id, @showable_video.user.id, @showable_video.video.id)
  </code></pre>
  
  <p>and I definite it in my model:</p>
  
  <pre><code>  def delete_heard_timeline_event(actor_id, subject_id, secondary_subject_id)
        TimelineEvent.find_by_actor_id_and_subject_id_and_secondary_subject_id_and_event_type(actor_id, subject_id, secondary_subject_id, 'heard_event').destroy
    end 
  </code></pre>
  
  <p>Why is rails telling me that the method is undefined?</p>