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Ok, now he is really showing us up:

Beginner mistake number 3:
Associations.  If you’ve worked with relational databases at all you probably know the concepts one-to-one, one-to-many, and many-to-many, and you’ve probably cried your self to sleep on a numerous occasions writing join statements that probably are longer than some children’s books.  Every Rails developers learns the basics of Rail’s model associations.

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