How define HABTM with models without jointable

Hi
I have 2 models that haven't DB like datasource.
Now I would set a HABTM relation between these models ( I manage the
data to save with my create method in my datasource).
Now If I don't set a jointable when define HABTM relation I get an
error.
How can I define a HABTM relation without jointable?
Many Thanks
Marco
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