class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age Multi1 filter",
queryset=M().objects.filter(age=1),
),
QuerysetConstraint(
name="QC: Disallow age Multi2 filter",
queryset=M().objects.filter(age=2),
),
]
class Meta:
unique_together = ("pizza", "topping")
constraints = [
# A pizza with more than 5 toppings gets soggy
QuerysetConstraint(
name='At most 5 toppings',
queryset=M().objects.values('pizza').annotate(
num_toppings=Count('topping')).filter(num_toppings__gt=5),
),
# This constraint should be self-explanatory for civilized people
QuerysetConstraint(
name='No pineapple',
queryset=M().objects.filter(topping__name="Pineapple")),
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age in or via Q",
queryset=M().objects.filter(Q(age=1) | Q(age=2)),
)
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age in list",
queryset=M().objects.filter(age__in=[1, 2]),
)
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age=1 via subquery with 7 subqueries",
queryset=generate_subquery(7),
)
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age range filter",
queryset=M().objects.filter(age__range=(1, 2)),
)
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age AND filter",
queryset=M().objects.filter(age__gte=1).filter(age__lte=2),
)
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age=1 via trigger NEW",
queryset=M().objects.annotate(
new_age=RawSQL("NEW.age", ())).filter(new_age=1),
)
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age>0 via subquery slice",
queryset=M().objects.annotate(max_age=Subquery(M().objects.all(
).values("age").order_by("-age")[:1])).filter(max_age__gte=1),
)
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age=1 via subquery",
queryset=M().objects.annotate(
collision=Exists(M().objects.filter(age=1))).filter(
collision=True),
)
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age=1 via annotation",
queryset=M().objects.annotate(disallowed=Value(
1, output_field=models.IntegerField())).filter(
age=F("disallowed")),
)
]
class Meta:
constraints = [
models.CheckConstraint(name="CC: Disallow age MultiMixed filter",
check=~Q(age=1)),
QuerysetConstraint(
name="QC: Disallow age MultiMixed filter",
queryset=M().objects.filter(age=2),
),
]
class Meta:
constraints = [
QuerysetConstraint(
name="QC: Disallow age>0 via When",
queryset=M().objects.annotate(block=Case(
When(age=1, then=F("age")),
When(age__gt=1, then=Value(1)),
default=Value(0),
output_field=models.IntegerField(),
)).filter(block=1),
)
]
class Meta:
constraints = [
QuerysetConstraint(name="QC: Disallow age=1",
queryset=M().objects.filter(age=1))
]
class Meta:
constraints = [
# Allow only 1 object in table (by using offset 1)
QuerysetConstraint(name="QC: Allow only 1 object",
queryset=M().objects.all()[1:])
]
class Meta:
constraints = [
QuerysetConstraint(name="QC: Allow only 0",
queryset=M().objects.exclude(age=0))
]