Tuesday, May 24, 2016
I think it depends on your use case. Things to consider:
1. Selecting all comments of a user via 1 association or N associations (and 1 vs N queries).
2. Storing more data in the table (:commentable_type).
3. Maintaining and testing one model vs testing N models.
I think the biggest problem with separate comment models is that references from other models are the fact that you need N times more associations to reference a comment (e.g. user.post_comments, user.picture_comments, ... instead of user.comments).
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