Has_one association should be a has “only” one association?

You can put a check in the new action to see if the user already has a gallery and either redirect the user saying they already have a gallery or alert the user that creating a new gallery will destroy their existing one. In the latter case you would also need to check for the existing gallery in the create action and delete it before saving the new one otherwise you will have ownerless galleries filling your database.

You can put a check in the new action to see if the user already has a gallery and either redirect the user saying they already have a gallery or alert the user that creating a new gallery will destroy their existing one. In the latter case you would also need to check for the existing gallery in the create action and delete it before saving the new one otherwise you will have ownerless galleries filling your database. In your views you could check the same and only show the new link if the user does not have a gallery.

Re your first question: What has_one really does is that it appends the LIMIT 1 clause to the corresponding sql query, and nothing more. That's why, in your case, the user can create as many galleries as they want.

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