There's probably a very simple answer to this but I can't see it at
the moment:
This model:
class Product(models.Model):
user = models.ForeignKey(User, related_name="product_list",
editable=False)
productid = models.CharField(max_length=40, blank=True)
prodname = models.CharField(max_length=255, verbose_name='Product
name')
proddesc = models.TextField(blank=True, verbose_name='Description')
prodtopcat = models.ForeignKey(ProductTopCategory,
verbose_name='Product Main Category')
prodsubcat = models.ForeignKey(ProductSubCategory,
verbose_name='Product Sub Category')
unit = models.ForeignKey(Units, verbose_name='Unit')
video = models.ManyToManyField('Video', blank=True,
verbose_name='Video')
costperunit = models.DecimalField(max_digits=6, decimal_places=2,
verbose_name='Cost per unit')
costperlot = models.DecimalField(max_digits=6, decimal_places=2,
verbose_name='Cost per lot')
available = models.BooleanField(default=True)
featured = models.BooleanField(blank=True, null=True)
is used to generate a ModelForm with two modified fields that enable
the field 'prodsubcat' to be dynamically populated based on the
selection of 'prodtopcat'.
class DynamicChoiceField(forms.ChoiceField):
def clean(self, value):
return value
class ProductForm(ModelForm):
prodsubcat = DynamicChoiceField(widget=forms.Select(attrs=
{'disabled': 'true'}), choices =(('-1', 'Select Top Category'),))
I took this from an item I found on the web. I think setting the
'disabled' attribute is all I actually need.
The dynamic lookup is performed using jQuery.getJSON with this view:
def feeds_subcat(request, cat_id):
from django.core import serializers
json_subcat = serializers.serialize("json",
ProductSubCategory.objects.filter(prodcat = cat_id), fields=('id',
'shortname', 'longname'))
return HttpResponse(json_subcat, mimetype="application/javascript")
and the SELECT HTML is generated like this:
options += '<option value="' + j[i].pk + '">' + j[i].fields
['longname'] + '</option>';
This all works, but on submitting the form, I get the error 'Cannot
assign "u'17'": "Product.prodsubcat" must be a "ProductSubCategory"
instance' where "u'17'" is the option value of id_prodsubcat
What type of variable should I be passing (I assume int) and where
should I be converting it? In validation, in the pre-save signal, in
the save signal? Or should I be trying to convert it on the form
itself? Where is the ForeignKey instance save process documented?
TIA
Simon
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