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138 lines
3.8 KiB
Python
138 lines
3.8 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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condition=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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condition=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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condition=models.Q(
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models.Q(unit__isnull=True) | 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(
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fields=["name", "color"],
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name="name_color_uniq",
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# Custom message and error code are ignored.
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violation_error_code="custom_code",
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violation_error_message="Custom message",
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)
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]
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class ChildUniqueConstraintProduct(UniqueConstraintProduct):
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pass
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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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condition=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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class JSONFieldModel(models.Model):
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data = models.JSONField(null=True)
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class Meta:
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required_db_features = {"supports_json_field"}
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class ModelWithDatabaseDefault(models.Model):
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field = models.CharField(max_length=255)
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field_with_db_default = models.CharField(
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max_length=255, db_default=models.Value("field_with_db_default")
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)
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