I'm currently trying to access the ForeignKey to attribute in a for loop as I require it to be dynamic. Neither django's docs nor online search delivered any helpful results.
Here's what I'm using: Django 1.11 with Django CMS 3.5.2 and Django Countries package. The error message is:
AttributeError: 'ForeignKey' object has no attribute 'to
However, accessing the field's name or verbose_name or even choices attribute (for charFields or IntegerFields) works.
models.py
company = models.ForeignKey(verbose_name=_('Company'), blank=False, null=False, to='accounts.CompanyName',
on_delete=models.CASCADE)
views.py
def generate_view(instance):
model = apps.get_model(app_label='travelling', model_name=str(instance.model))
data = dict()
field_list = eval(instance.fields)
fields = model._meta.get_fields()
output_list = list()
for field in fields:
for list_field in field_list:
if field.name == list_field:
options = list()
if field.__class__.__name__ == 'ForeignKey':
print(field.to) # Here's the error
elif field.__class__.__name__ == 'CountryField':
for k, v in COUNTRIES.items():
options.append((k, v)) # Works properly
elif field.__class__.__name__ == 'ManyToManyField':
pass # Yields the same issues as with foreign keys
output_list.append({
'name': field.name,
'verbose': field.verbose_name,
'options': options,
'type': field.__class__.__name__
})
return data
As you see, there isn't an attribute called to. That's the name of a parameter of the ForeignKey initializer. Since the argument can be a string model reference, or "self", it makes sense that the attribute representing the actual model target should have a different name.
The Field attribute reference defines the API for introspecting field objects. What you're after is something like:
if field.many_to_one:
print(field.related_model)