DataMapper - why “has” and “belongs_to”?

You specify both sides of the relationship only when you want to use the methods generated by the extra specification. It's completely optional: If you never need to get to the Post from the Comment (e.g. Comment. Post ), you won't have to specify the belongs_to relation in Comment .

That gives you the methods to access the relational object easily. Such as @post. Comments @comment.post.

I see what you mean, applying has_many could imply the belongs_to. Though given the developer overhead to add the belongs_to, is probably better than adding more system overhead to dynamically add the methods to the right class.

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