I am struggling right now with the same concerns :-)
I have a hand-written form for a model with ManyToMany field.
So far, I noted a few things that helped me come to a working
solution, but maybe not really elegant...
The form initialization with an object looks like this (I hope...):
my_form = MyForm(initial=my_object.__dict__)
=> ManyToMany fields do not show up in that __dict__.
I had to add them by hand, turning the above one-liner into this:
initial_values = my_object.__dict__
initial_values.update({'m2m_field' = [obj.id for obj in
my_object.m2m_field.all()]})
my_form = MyForm(initial=initial_values)
To summarize, I built the list of ids from the ManyToMany relation to
my form, appending that list to the dict passed as initial data.
I am not really happy with that solution, maybe some more advanced
newforms user may lead a better way.
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