- March 2, 2008
- newforms modelchoicefield modelform
- 5 (after 5 ratings)
ModelChoiceField allows you to use filtered queries to simplify your forms. This is great for adding objects but can fall down when you edit an existing object and the original query no longer contains the referenced field (e.g. I like to use an "active" field in several objects).
The fix is simply to include an extra param: Q(pk=object_id). You have to do this in the init method to get the object_id.
A nice thing about this is that it works for ModelForms as well as custom Forms.
1 2 3 4 5 6 7 8 9 10
class MyModelForm(forms.ModelForm): def __init__(self, *args, **kwargs): super(MyModelForm, self).__init__(*args, **kwargs) if self.instance: self.fields['myfield'].queryset = \ MyOtherModel.objects.filter( Q(active=True)|Q(pk=self.instance.myfield_id)) class Meta: model = MyModel
More like this
- Automatically setup raw_id_fields ForeignKey & OneToOneField by agusmakmun 8 months ago
- Crispy Form by sourabhsinha396 8 months, 3 weeks ago
- ReadOnlySelect by mkoistinen 9 months, 1 week ago
- Verify events sent to your webhook endpoints by santos22 10 months ago
- Django Language Middleware by agusmakmun 10 months, 2 weeks ago