prepopulate django formset with certain values - django

Question

I've struggled for weeks with Django's ModelFormSet & co, head exploding.
I searched hours,days on the internet to find a solution, but nothing really helpful for my special problem:
I have 2 models (here simplified):
class BaseSetting(models.Model):
"""This is a basic model which holds namespace and key of a setting."""
namespace = models.CharField(max_length=25)
key = models.CharField(max_length=255)
class ScopedSetting(models.Model):
"""Model class for all scoped MedUX settings.
Settings are generally saved as strings, but are interpreted at retrieval
and casted into their correct types. ScopedSettings knows about
``str``, ``int``, ``bool``"""
base = models.ForeignKey(BaseSetting, on_delete=models.CASCADE)
"""The FK to the basic settings fields like namespace, key."""
tenant = models.ForeignKey(
Tenant,
verbose_name=_("Tenant"),
on_delete=models.CASCADE,
default=None,
null=True,
blank=True,
)
group = models.ForeignKey(
Group, on_delete=models.CASCADE, default=None, null=True, blank=True
)
device = models.ForeignKey(
Device, on_delete=models.CASCADE, default=None, null=True, blank=True
)
user = models.ForeignKey(
settings.AUTH_USER_MODEL,
on_delete=models.CASCADE,
default=None,
null=True,
blank=True,
)
scope = models.IntegerField(choices=Scope.choices)
"""The scope where this setting is valid."""
value = models.CharField(max_length=255, null=True)
ATM I am using django-extra-views to get a simple ModelFormSetView - and it shows a form, but not what I want:
For each BaseSetting (namespace,key) there exists up to 5 different ScopedSettings which could be applicable to the current user, depending on their scope: the vendor, the current tenant, group, device, or user: So each user can have an own setting, each tenant etc., but the user setting for one user, if available as DB object, overrides the vendor's setting. There is a clear permissions system and scope cascade to check which setting is applicable, and all this works. I just want to edit those settings.
So I'd like to have a View under /settings/<base_setting_pk>/ which shows basically (simplified, its even more complicated) all 5 scopes: VENDOR, TENANT, GROUP, DEVICE, USER.
This is the perfect use case for a formset IMHO, BUT: It should show all these 5 Scopedsettings, even when they are not present in the DB.
Here extra=... comes in, and I am able to show the correct number of items.
class BaseSettingsDetailView(HtmxMixin, ModelFormSetView):
# ScopedPermissionRequiredMixin,
model = ScopedSettings
form_class = ScopedSettingsForm
formset = ScopedSettingsModelFormSet
fields = ["value", "scope"]
enforce_htmx = False
ordering = ["scope"]
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
def setup(self, request, *args, **kwargs):
super().setup(request, *args, **kwargs)
self.base_instance = self.get_queryset().first().base
self.scopes = SettingsRegistry.scopes(
self.base_instance.namespace, self.base_instance.key
)
self.additional = []
def get_queryset(self):
return super().get_queryset().filter(base_id=self.kwargs.get("pk"))
def get_factory_kwargs(self):
def formfield_callback(field_name) -> forms.Field:
print(field_name)
if field_name:
return forms.CharField()
for scope in self.scopes:
if self.get_queryset().filter(scope=scope.value).exists():
pass
else:
self.additional.append(
ScopedSettings(base=self.base_instance, scope=scope)
)
factory_kwargs = super().get_factory_kwargs()
max_num = len(self.get_queryset()) + len(self.additional)
factory_kwargs.update(
{"max_num": max_num, "formfield_callback": formfield_callback}
)
return factory_kwargs
But I cant get the Form to show correct data in the empty, uninitialized, extra fields:
They are just labelled "value".
What I need is 5 fields, each labelled by scope. Some of them should be populated with the queryset (this could be the first and the third e.g.), and the others should be empty, but labelled coorectly (and prefilled with the missing scope, each one)
I hope this is understandable.
Any hint welcome.