Good cheat or ref map for Rails ActiveRecord

Question

I am just starting with Rails and ActiveRecord. I feel that everything I want to do is related between two models ( belongs_to , has_one , has_many ) I need to read the documentation again and again to really understand it.

Does anyone know of a good card or props that makes the differences visible?

Answer 1

I offer you this Guide (chapter 2)

Answer 2

Amy Hoy has a pretty nice ActiveRecord Relationships trickster for the basics of these.

Answer 3

I really like the cheat lists on err-the-blog

So you can print has_many , belongs_to and has_one and refer to them. (or tag them)