class RoleForm(forms.ModelForm):
class Meta:
model = models.RoleModel
fields = ['name']
class FeatureForm(forms.ModelForm):
role = forms.ModelChoiceField(queryset=models.RoleModel.objects.values_list('name', flat=True).distinct())
class Meta:
model = models.FeatureModel
fields = ['role','feature']
In my bootstrap form, the choices display properly. I get a list of all roles. But if I fill the feature form and hit submit it says - "Select a valid choice. That choice is not one of the available choices."
My models are:
class RoleModel(models.Model):
name = models.CharField(validators=[alphanumeric], max_length=50, unique=True, blank=False)
class FeatureModel(models.Model):
role = models.ForeignKey(RoleModel, on_delete=models.PROTECT)
feature = models.CharField(validators=[alphanumeric], max_length=10, unique=True)
My need is simple. The second form (FeatureForm) has two fields. role being foreign key of another model and a text field to type in name of a feature. On my client side, I need the foreign key to be displayed as a select option with a list. I chose a value from this select, enter the value of feature and hit save. It has to save.
解决方案
It doesn't work, because your queryset includes only names, but you need an id / primary key of a RoleModel. Since your choices don't have an id, they aren't a valid choice.
Firstly, your RoleModel name is set to unique and is therefore no point in querying distinct() name values because they will be distinct already by unique definition.
You also don't need to construct your own select input. Django will take care of this.
All you need is:
class RoleModel(models.Model):
name = models.CharField(validators=[alphanumeric], max_length=50, unique=True, blank=False)
def __str__(self):
return self.name
class FeatureForm(forms.ModelForm):
class Meta:
model = models.FeatureModel
fields = ['role', 'feature']
def __init__(self, *args, **kwargs):
super(FeatureForm, self).__init__(*args, **kwargs)
for field in self.fields:
self.fields[field].widget.attrs = {'class': 'form-control'}