mirror of https://github.com/django/django.git
128 lines
3.7 KiB
Python
128 lines
3.7 KiB
Python
from django.db import models
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class Product(models.Model):
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price = models.IntegerField(null=True)
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discounted_price = models.IntegerField(null=True)
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unit = models.CharField(max_length=15, null=True)
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class Meta:
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required_db_features = {
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'supports_table_check_constraints',
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}
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constraints = [
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models.CheckConstraint(
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check=models.Q(price__gt=models.F('discounted_price')),
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name='price_gt_discounted_price',
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),
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models.CheckConstraint(
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check=models.Q(price__gt=0),
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name='%(app_label)s_%(class)s_price_gt_0',
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),
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models.CheckConstraint(
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check=models.expressions.RawSQL(
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'price < %s', (1000,), output_field=models.BooleanField()
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),
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name='%(app_label)s_price_lt_1000_raw',
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),
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models.CheckConstraint(
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check=models.expressions.ExpressionWrapper(
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models.Q(price__gt=500) | models.Q(price__lt=500),
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output_field=models.BooleanField()
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),
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name='%(app_label)s_price_neq_500_wrap',
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),
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models.CheckConstraint(
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check=models.Q(
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models.Q(unit__isnull=True) |
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models.Q(unit__in=['μg/mL', 'ng/mL'])
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),
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name='unicode_unit_list',
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),
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]
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class UniqueConstraintProduct(models.Model):
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name = models.CharField(max_length=255)
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color = models.CharField(max_length=32, null=True)
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class Meta:
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constraints = [
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models.UniqueConstraint(fields=['name', 'color'], name='name_color_uniq'),
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]
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class UniqueConstraintConditionProduct(models.Model):
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name = models.CharField(max_length=255)
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color = models.CharField(max_length=32, null=True)
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class Meta:
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required_db_features = {'supports_partial_indexes'}
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constraints = [
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models.UniqueConstraint(
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fields=['name'],
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name='name_without_color_uniq',
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condition=models.Q(color__isnull=True),
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),
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]
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class UniqueConstraintDeferrable(models.Model):
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name = models.CharField(max_length=255)
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shelf = models.CharField(max_length=31)
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class Meta:
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required_db_features = {
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'supports_deferrable_unique_constraints',
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}
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constraints = [
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models.UniqueConstraint(
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fields=['name'],
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name='name_init_deferred_uniq',
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deferrable=models.Deferrable.DEFERRED,
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),
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models.UniqueConstraint(
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fields=['shelf'],
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name='sheld_init_immediate_uniq',
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deferrable=models.Deferrable.IMMEDIATE,
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),
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]
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class UniqueConstraintInclude(models.Model):
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name = models.CharField(max_length=255)
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color = models.CharField(max_length=32, null=True)
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class Meta:
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required_db_features = {
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'supports_table_check_constraints',
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'supports_covering_indexes',
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}
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constraints = [
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models.UniqueConstraint(
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fields=['name'],
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name='name_include_color_uniq',
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include=['color'],
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),
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]
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class AbstractModel(models.Model):
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age = models.IntegerField()
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class Meta:
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abstract = True
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required_db_features = {
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'supports_table_check_constraints',
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}
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constraints = [
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models.CheckConstraint(
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check=models.Q(age__gte=18),
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name='%(app_label)s_%(class)s_adult',
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),
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]
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class ChildModel(AbstractModel):
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pass
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