Get data from two django models - django

Question

My models look like this:
class UserDevice(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.PROTECT, null=False)
device = models.ForeignKey(Device, on_delete=models.PROTECT, null=False)
activation_date = models.DateTimeField(default=timezone.now, null=False)
friendly_name = models.CharField(max_length=20, null=True, blank=True)
is_owner = models.BooleanField(null=False, default=False)
is_admin = models.BooleanField(null=False, default=True)
is_alerts_enabled = models.BooleanField(null=False, default=True)
timeStamp = models.DateTimeField(auto_now = True, null=False)
class UserProfile(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.PROTECT, null=False)
token = models.TextField(null=False, blank=True)
first_name = models.TextField(null=True, blank=True)
last_name = models.TextField(null=True, blank=True)
timeStamp = models.DateTimeField(auto_now = True, null=False)
I need to get device, user, is_alerts_enabled, is_admin, is_owner from UserDevice and first_name, last_name, token from userProfile. This is what I have so far and it gives me what I need from userdevice but I can't figure out how to add the userprofile stuff.
nonOwners = UserDevice.objects.filter(device=device, is_owner=False)
if nonOwners is None:
return errormsg('non nonOwners found for this device')
nonOwnersArray=[]
for nonOwner in nonOwners:
nonOwner_data = model_to_dict(nonOwner,
fieldlist=(
'device.serial',
'user.email',
'is_alerts_enabled',
'is_admin',
'is_owner',
),
rename={
'device.serial': 'serial',
'user.email': 'email'})
nonOwnersArray.append(nonOwner_data)
Any help would be greatly appreciated. Thanks!

Answer 1

The best way to get a dictionary of values is to use values().
UserDevice.objects.filter(device=device, is_owner=False).values('device', 'user', 'is_alerts_enabled', 'is_admin', 'is_owner')
The above line will give you the relevant fields of the UserDevice model as dictionary values.
If you add a foreign key to UserDevice (here I have changed the user field):
class UserDevice(models.Model):
user = models.ForeignKey(UserProfile, on_delete=models.PROTECT, null=False)
device = models.ForeignKey(Device, on_delete=models.PROTECT, null=False)
activation_date = models.DateTimeField(default=timezone.now, null=False)
friendly_name = models.CharField(max_length=20, null=True, blank=True)
is_owner = models.BooleanField(null=False, default=False)
is_admin = models.BooleanField(null=False, default=True)
is_alerts_enabled = models.BooleanField(null=False, default=True)
timeStamp = models.DateTimeField(auto_now = True, null=False)
You may do this:
UserDevice.objects.select_related('user').filter(device=device, is_owner=False).values('device', 'user', 'is_alerts_enabled', 'is_admin', 'is_owner', 'user__first_name', 'user__last_name', 'user__token')
I have used select_related() to avoid hitting the database unnecessarily.