Hi all,
is it possible to obtain the model instance for a ModelChoiceField in
the constructor of the Form?
Here is a short example that illustrates the problem:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class Department(models.Model):
pass
class Staff(models.Model):
departments = models.ManyToManyField(Department)
class SetDepForStaff_Form(forms.Form):
St = forms.ModelChoiceField(queryset=Staff.objects.all(),
widget=forms.HiddenInput())
Dep = forms.ModelChoiceField(queryset=Department.objects.all())
def __init__(self, *args, **kwargs):
user = kwargs.pop('user')
super(SetDepForStaff_Form, self).__init__(*args, **kwargs)
# Working, but not what we need: passing in data via the form
constructor.
self.fields['Dep'].queryset = user.department_set.all()
# Wanted: How can we access the model instance for the St field?
# It would be the initial value if the form is created with
# SetDepForStaff_Form(initials=...)
# or the selected value if created with
# SetDepForStaff_Form(request.POST)
self.fields['Dep'].queryset =
model_instance_of(self.fields['St']).departments.all()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Any help would be very much appreciated!! :-)
Best regards,
Carsten
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