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|
from django.db import models
class Product(models.Model):
price = models.IntegerField(null=True)
discounted_price = models.IntegerField(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',
),
]
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'),
models.UniqueConstraint(
fields=['name'],
name='name_without_color_uniq',
condition=models.Q(color__isnull=True),
),
]
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
|
