Clash Royale CLAN TAG

Get() a Model object from it's UUID

AIM

As part of a weather-dependent alarm clock project, each alarm will contain three categories of info: 1) date/time, 2) weather conditionals, 3) location.

EDIT

Once the User completes the SetAlarmForm, I am trying to create an Alarm object based on the Form-input and timezone, city and country based on the User's IP address.

SetAlarmForm

Alarm

timezone

city

country

I am attempting to retrieve the information inputted by the User in the Form, and assign that information to an Alarm object (identifiable by a UUID reference).

Form

Alarm

As requested in a comment, the URL is https://jqlc3gdp.apps.lair.io/login/

CODE

Models.py

class User(models.Model):
""" Model representing each User """
username = models.CharField(max_length=10, unique=True)

class Alarm(models.Model):
""" Model representing each Alarm """
alarm_id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
# in future, remove null=True. I included it for the time being to workaround an error.
username = models.ForeignKey(User, on_delete=models.CASCADE, null=True)
timezone = models.CharField(max_length=30)
city = models.CharField(max_length=30)
country = models.CharField(max_length=30)
time = models.DateTimeField()
temp_max = models.FloatField(blank=True, null=True)
temp_min = models.FloatField(blank=True, null=True)


Views.py

class SetAlarmView(FormView):
""" FormView for User to create the Alarm """
<code omitted>

def form_valid(self, form):
form.save()
self.get_user_timezone()
return super().form_valid(form)

def get_user_timezone(self):
""" Function to get User's timezone, city and country from IP """
<code omitted>
alarm_object, created = Alarm.objects.get_or_create(
alarm_id=uuid.uuid4(),
username=self.request.POST.get('username'),
timezone=timezone,
city=location.raw['address']['city'],
country=location.raw['address']['country'],
time=self.request.POST.get('time'),
temp_conditional=self.request.POST.get('temp_conditional'),
surf_conditional=self.request.POST.get('surf_conditional'),
temp_max=self.request.POST.get('temp_max'),
temp_min=self.request.POST.get('temp_min'),
surf_max=self.request.POST.get('surf_max'),
surf_min=self.request.POST.get('surf_min'),
)
alarm_object.save()


Alarm.objects.get

get_or_create()

time

1 Answer
1

Just set the DateTimeField time to be unique (time = models.DateTimeField(unique=True)) in your models. Any time 2 instances have the same time, the last one won't get saved and an error will be thrown.

time = models.DateTimeField(unique=True)

If an alarm_id (the local variable, not the model field) (This is not a good name for it. It's not an id, it's a time representation that you're using as an identifier which also happens to clash with the name of an actual field in your model), is used that is used in another object, you can catch the error, alert the user and obviously not save the object.

Then, you can make queries like you are in your code.

time

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