Chapter 11.1.2. Many-to-Many Relationships (RelatedJoin)
The one-to-many relationship can be used to describe a lot of the data you might have. Functions belong to one module. But sometimes you need to express relationships that don’t have that “belong to†character. And that’s where many-to-many relationships come in.
In dry academic terms, a many-to-many relationship means that object type A has or contains multiple objects of type B, and at the same time, object B has or contains multiple objects of type A. A real-life example is friends. You can have a whole bunch of friends, and all of those friends can have a whole bunch of other friends besides just you. Or, if you spend too much time programming to have friends, perhaps another ...
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