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from django.db import models
class Product(models.Model):
price = models.IntegerField(null=True)
discounted_price = models.IntegerField(null=True)
unit = models.CharField(max_length=15, null=True)
class Meta:
required_db_features = {
"supports_table_check_constraints",
}
constraints = [
models.CheckConstraint(
check=models.Q(price__gt=models.F("discounted_price")),
name="price_gt_discounted_price",
),
models.CheckConstraint(
check=models.Q(price__gt=0),
name="%(app_label)s_%(class)s_price_gt_0",
),
models.CheckConstraint(
check=models.Q(
models.Q(unit__isnull=True) | models.Q(unit__in=["μg/mL", "ng/mL"])
),
name="unicode_unit_list",
),
]
class UniqueConstraintProduct(models.Model):
name = models.CharField(max_length=255)
color = models.CharField(max_length=32, null=True)
class Meta:
constraints = [
models.UniqueConstraint(
fields=["name", "color"],
name="name_color_uniq",
# Custom message and error code are ignored.
violation_error_code="custom_code",
violation_error_message="Custom message",
)
]
class ChildUniqueConstraintProduct(UniqueConstraintProduct):
pass
class UniqueConstraintConditionProduct(models.Model):
name = models.CharField(max_length=255)
color = models.CharField(max_length=32, null=True)
class Meta:
required_db_features = {"supports_partial_indexes"}
constraints = [
models.UniqueConstraint(
fields=["name"],
name="name_without_color_uniq",
condition=models.Q(color__isnull=True),
),
]
class UniqueConstraintDeferrable(models.Model):
name = models.CharField(max_length=255)
shelf = models.CharField(max_length=31)
class Meta:
required_db_features = {
"supports_deferrable_unique_constraints",
}
constraints = [
models.UniqueConstraint(
fields=["name"],
name="name_init_deferred_uniq",
deferrable=models.Deferrable.DEFERRED,
),
models.UniqueConstraint(
fields=["shelf"],
name="sheld_init_immediate_uniq",
deferrable=models.Deferrable.IMMEDIATE,
),
]
class UniqueConstraintInclude(models.Model):
name = models.CharField(max_length=255)
color = models.CharField(max_length=32, null=True)
class Meta:
required_db_features = {
"supports_table_check_constraints",
"supports_covering_indexes",
}
constraints = [
models.UniqueConstraint(
fields=["name"],
name="name_include_color_uniq",
include=["color"],
),
]
class AbstractModel(models.Model):
age = models.IntegerField()
class Meta:
abstract = True
required_db_features = {
"supports_table_check_constraints",
}
constraints = [
models.CheckConstraint(
check=models.Q(age__gte=18),
name="%(app_label)s_%(class)s_adult",
),
]
class ChildModel(AbstractModel):
pass
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