I have an Item model. It has both a primary key and an item number; the
users refer to item numbers when finding things, and the actual primary key
is not exposed. I'm trying to write a CreateView that will allow the user
to input the item number.
I see that CreateView defaults to using the primary key to find model
objects, which any other time makes sense. I'm thinking the solution is to
use a ModelForm, but I'm stuck on the same problem--I'm not sure how to
accept a string from the user (instead of the primary key), do my own
query, and fetch the required model object that way. I think overriding
is_valid() is the correct way to go, but I'm not sure what I'm leaving
out--when I override this method, the data is never committed to the
database even though I call super(). I've also tried overriding save() and
clean() on the ModelForm, but with the same results (that is, no data in
the database).
I'm writing a simple app that uses Item as a foreign key:
class ItemsTestCollection(models.Model):
"""An item to be tested in Box Opt."""
item = models.ForeignKey('item.Item', on_delete=models.CASCADE)
qty = models.IntegerField()
case = models.ForeignKey('EvaluateTestCase', on_delete=models.CASCADE)
box = models.ForeignKey('BoxResults', on_delete=models.CASCADE, null=True)
...using this CreateView:
class AddItemsToEvaluateCreateView(CreateView):
model = ItemsTestCollection
form_class = AddItem
# fields = ['item', 'qty', 'case']
template_name = 'utils\evaluate.html'
# Not working...
def form_valid(self, form):
data = form.save(commit=False)
item_num = data.item
data.item = Item.objects.get(item_number=item_num)
data.save()
return self.get_success_url()
...and this ModelForm:
class AddItem(forms.ModelForm):
class Meta:
model = ItemsTestCollection
fields = ['item', 'qty', 'case']
# widgets = {'item': CharField(max_length=6)}
# item = forms.CharField(max_length=6)
def is_valid(self):
item_num = self.data['item'] # ????
# self.data['item'] = Item.objects.get(item_number=item_num)
self.instance.item = Item.objects.get(item_number=item_num)
# self.instance.qty = self.data['qty']
# self.instance.case =
EvaluateTestCase.objects.get(pk=self.data['case'])
super().is_valid()
And I somehow need to refer to the Item by item_number and not the
auto-assigned pk:
class Item(models.Model):
"""Item attributes"""
item_number = models.CharField(max_length=6, null=True, unique=True)
Thank you!
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