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from django.db.models import (
CASCADE,
Manager,
Model,
QuerySet,
AutoField,
CharField,
ForeignKey,
IntegerField,
TextField,
)
class LT40QuerySet(QuerySet):
def lt40(self):
return self.filter(amount__lt=40)
class LT25QuerySet(QuerySet):
def lt25(self):
return self.filter(amount__lt=25)
class Region(Model):
name = TextField(primary_key=True)
parent = ForeignKey("self", null=True, on_delete=CASCADE)
class Meta:
db_table = "region"
class User(Model):
id = AutoField(primary_key=True)
name = TextField()
class Meta:
db_table = "user"
class Order(Model):
id = AutoField(primary_key=True)
region = ForeignKey(Region, on_delete=CASCADE)
amount = IntegerField(default=0)
user = ForeignKey(User, null=True, on_delete=CASCADE)
class Meta:
db_table = "orders"
class OrderFromLT40(Order):
class Meta:
proxy = True
objects = Manager.from_queryset(LT40QuerySet)()
class OrderCustomManagerNQuery(Order):
class Meta:
proxy = True
objects = Manager.from_queryset(LT25QuerySet)()
class KeyPair(Model):
key = CharField(max_length=32)
value = IntegerField(default=0)
parent = ForeignKey("self", null=True, on_delete=CASCADE)
class Meta:
db_table = "keypair"
|
