CheckboxSelectMultiple does not correctly bind to the form attribute passed in when rendered outside its containing form

[Dylan Young]

This means that POSTing the form does not submit the accompanying selected data.

This seems to be an issue with attrs={'form': 'theform'} not being passed through to the underlying checkbox inputs.

SelectMultiple behaves as expected (submitting with the form).

Minimal (inefficient) Example (must be included on a page with a form named 'theform' to see the problematic POST):

class UserSelectForm(Form):
    selected_users = MultipleChoiceField(
                    choices=[('ex', 'Example'), ('ex2', 'Example2')],
                    initial='ex',
                    widget=CheckboxSelectMultiple(attrs={'form': 'theform'}),
                    required=True)

Not sure if this is fixed in Django>1.8 as I have found no other reference to the bug.

[Tim Graham]

Please try to confirm bugs on Django master (or at least on the latest released version) instead of reporting bugs for Django 1.8. Django 1.8 only receives fixes for security and data loss issues at this point.

[Tim Graham]

On both Django master and 1.8.x, I see form="theform" in the rendered HTML of both checkbox inputs. Please provide more details (a sample project would be nice) if you can reproduce your problem with Django master (or at least 1.11.x or 2.0 alpha).

[Dylan Young]

Hmmm... I'll dig deeper. Maybe this is an issue with crispy-forms that needs to be submitted.

As for your other note, this is in fact a data loss bug: every bit of data in that CheckboxSelectMultiple is lost on submit, barring an additional layer that saves dirty data in the form client-side for recovery.

[Dylan Young]

Confirmed that it's an issue with crispy-forms==1.5.2 and not Django. Thanks!