rails HABTM migrations

From a practical and best practices perspective, should rails models that have HABTM association also have a defined model for example users_groups.rb. So, should you

script generate model ...

or simply

script generate migration ...

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On one hand the join table is simply two fields and shouldn't have any methods of its own, on the other hand, in rails (model = table). So would it be wise to have it defined in models as well as in migrations?

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Hi as for me if you have has_and_belongs_to_many you don't need any model but if you use has_many+:through you'll need one