[Rails] Join two models

Need some help with understanding the best way of doing the
following:

I have a user model and two models (link_post and text_post) i now
want to join the models together as post.
both link_post and text_post has a user_id column.

What a i want is to get
u = User.first
u.posts
to collect all link_post and text_post together.

Should this be done with a scope or with some model association ? I
don't need a controller for posts just the self join.
But if i can get other scopes on "posts" it would be great... (like
published_on etc ...)

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