[Rails] Types of associations (one-to-many / many-to-many)

For organizing the brain

The first time programming beginners started learning Rails, huh? The association that is (should) be the point. There are many individual articles about associations, so I tried to sort out the types as a whole.

Types of associations

アソシエーション表.png It can be classified as shown in the table. (This time, the one-to-one association was omitted.)

Summary

--Many-to-many requires an intermediate table --Self-join requires a foreign key that references the same model

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