symposion_app/registrasion/forms.py

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import models as rego
from django import forms
class ProductItemForm(forms.Form):
product = forms.ModelChoiceField(queryset=None, empty_label=None)
quantity = forms.IntegerField()
def __init__(self, category, *a, **k):
super(ProductItemForm, self).__init__(*a, **k)
products = rego.Product.objects.filter(category=category)
self.fields['product'].queryset = products