Deciding to use @staticmethod, @property, or manager in Django
I want to create a simple geolocation-based app in Django. I want to keep the location of the user as the last lat/long from where he logged in. For that I have created a Location class. To store additional user data I have a UserProfile class. I want to keep the location column in UserProfile as well.
There are three ways of implementing it that I could think of -- using a @staticmethod , @property , or a manager. And then define a __unicode__ method which would return a list with lat/long of most recent date. Which would be the most apt way of doing it? Following is my model:
class Location(models.Model):
user = models.ForeignKey(User)
latitude = models.CharField(max_length=10)
longitude = models.CharField(max_length=10)
date = models.DateTimeField(auto_now_add = True)
class UserProfile(models.Model):
user = models.OneToOneField(User)
location = the_last_login_location
rating = models.IntegerField()
I'd use a property:
class Location(models.Model):
user = models.ForeignKey(User, related_name="locations")
latitude = models.CharField(max_length=10)
longitude = models.CharField(max_length=10)
date = models.DateTimeField(auto_now_add = True)
class UserProfile(models.Model):
user = models.OneToOneField(User)
rating = models.IntegerField()
@property
def last_location(self):
return self.locations.latest("date")
# Alternatively: return self.objects.all().order_by("-date")[0]
Note the related_name I've added to the user field in the Location model - it makes reverse lookups a little cleaner and easier to read
Edit : I changed the query to use latest()
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