Django, set initial data to formset with ManyToMany

Question

I need to set initial data to formset with ManyToMany field.

Usually i\'m doing like this when there is no ManyToMany field in forms o

Answer 1

Like this:

class CustomFormSet(BaseInlineFormSet):
    def __init__(self, *args, **kwargs):
        kwargs['initial'] = [
            {'foo_id': 1}
        ]
        super(CustomFormSet, self).__init__(*args, **kwargs)

the foo_id depends on the value that you're selecting for which field on the model relationship

You have to change also the has_changed method on the form class in order for the it to know that the initial values are "changed" to be taken in account when saved:

class CustomForm(forms.ModelForm):
    def has_changed(self):
        """
        Overriding this, as the initial data passed to the form does not get noticed,
        and so does not get saved, unless it actually changes
        """
        changed_data = super(starnpc_class, self).has_changed()
        return bool(self.initial or changed_data)