#24453: Initial values for ManyToMany form fields can't be hidden
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Reporter: girzel | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 1.7
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Initial values can be provided for the ManyToMany field of a ModelForm, to
be used in a ModelFormSet, but if the widget is switched to the
HiddenInput class, the (as far as I can tell correct) initial value
creates a validation error:
(Hidden field <field_name>) Enter a list of values.
Take this model:
{{{
class Work(models.Model):
authors = models.ManyToManyField(Author)
initial = dict(authors=[some_author_instance])
formset = WorkFormSet(queryset=Work.objects.none(), initial=[initial])
}}}
This is supposing one extra form in the formset. If the "authors" field
remains unhidden, the initial value works as expected. If we switch the
"authors" widget to a forms.HiddenInput, however, I get the above
validation error.
I don't think simply hiding the input should affect how the initial values
are treated. FWIW, here's an example what the hidden input looks like in
the HTML:
`<input id="id_form-1-authors" name="form-1-authors" type="hidden"
value="[37L]" />`
So presumably "[37L]" isn't getting read as a list, somewhere...
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Ticket URL: <https://code.djangoproject.com/ticket/24453>
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