updating wiki model

I'm totally lost as to how to tackle the "topics and posts" checkpoint. Part of the problem is the bad method names i used when creating the wiki model. I already had a :description (i called it :body) and had a :name (i called it :title) so i only needed :public. is that done through a migration? did i do it right? Can i insert :public into the earlier db/create_wikis file?

Next when doing the migration to AddWikiToArticles i tried using :wiki_id but it turns it i had created that under an earlier migration db/creat_wikis. So i used wiki_identification which makes things more complicated. 

Following the checkpoint, the updating seeds part kept blowing up. prob bcs nothings was making sense. help!