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from datetime import datetime
from django.core.exceptions import ValidationError
from django.db import models
from django.db.models.functions import Lower
def validate_answer_to_universe(value):
if value != 42:
raise ValidationError(
"This is not the answer to life, universe and everything!", code="not42"
)
class ModelToValidate(models.Model):
name = models.CharField(max_length=100)
created = models.DateTimeField(default=datetime.now)
number = models.IntegerField(db_column="number_val")
parent = models.ForeignKey(
"self",
models.SET_NULL,
blank=True,
null=True,
limit_choices_to={"number": 10},
)
email = models.EmailField(blank=True)
ufm = models.ForeignKey(
"UniqueFieldsModel",
models.SET_NULL,
to_field="unique_charfield",
blank=True,
null=True,
)
url = models.URLField(blank=True)
f_with_custom_validator = models.IntegerField(
blank=True, null=True, validators=[validate_answer_to_universe]
)
f_with_iterable_of_validators = models.IntegerField(
blank=True, null=True, validators=(validate_answer_to_universe,)
)
slug = models.SlugField(blank=True)
def clean(self):
super().clean()
if self.number == 11:
raise ValidationError("Invalid number supplied!")
class UniqueFieldsModel(models.Model):
unique_charfield = models.CharField(max_length=100, unique=True)
unique_integerfield = models.IntegerField(unique=True)
non_unique_field = models.IntegerField()
class CustomPKModel(models.Model):
my_pk_field = models.CharField(max_length=100, primary_key=True)
class UniqueTogetherModel(models.Model):
cfield = models.CharField(max_length=100)
ifield = models.IntegerField()
efield = models.EmailField()
class Meta:
unique_together = (
(
"ifield",
"cfield",
),
["ifield", "efield"],
)
class UniqueForDateModel(models.Model):
start_date = models.DateField()
end_date = models.DateTimeField()
count = models.IntegerField(
unique_for_date="start_date", unique_for_year="end_date"
)
order = models.IntegerField(unique_for_month="end_date")
name = models.CharField(max_length=100)
class CustomMessagesModel(models.Model):
other = models.IntegerField(blank=True, null=True)
number = models.IntegerField(
db_column="number_val",
error_messages={"null": "NULL", "not42": "AAARGH", "not_equal": "%s != me"},
validators=[validate_answer_to_universe],
)
class AuthorManager(models.Manager):
def get_queryset(self):
qs = super().get_queryset()
return qs.filter(archived=False)
class Author(models.Model):
name = models.CharField(max_length=100)
archived = models.BooleanField(default=False)
objects = AuthorManager()
class Article(models.Model):
title = models.CharField(max_length=100)
author = models.ForeignKey(Author, models.CASCADE)
pub_date = models.DateTimeField(blank=True)
def clean(self):
if self.pub_date is None:
self.pub_date = datetime.now()
class Post(models.Model):
title = models.CharField(max_length=50, unique_for_date="posted", blank=True)
slug = models.CharField(max_length=50, unique_for_year="posted", blank=True)
subtitle = models.CharField(max_length=50, unique_for_month="posted", blank=True)
posted = models.DateField()
class FlexibleDatePost(models.Model):
title = models.CharField(max_length=50, unique_for_date="posted", blank=True)
slug = models.CharField(max_length=50, unique_for_year="posted", blank=True)
subtitle = models.CharField(max_length=50, unique_for_month="posted", blank=True)
posted = models.DateField(blank=True, null=True)
class UniqueErrorsModel(models.Model):
name = models.CharField(
max_length=100,
unique=True,
error_messages={"unique": "Custom unique name message."},
)
no = models.IntegerField(
unique=True, error_messages={"unique": "Custom unique number message."}
)
class GenericIPAddressTestModel(models.Model):
generic_ip = models.GenericIPAddressField(blank=True, null=True, unique=True)
v4_ip = models.GenericIPAddressField(blank=True, null=True, protocol="ipv4")
v6_ip = models.GenericIPAddressField(blank=True, null=True, protocol="ipv6")
ip_verbose_name = models.GenericIPAddressField(
"IP Address Verbose", blank=True, null=True
)
class GenericIPAddrUnpackUniqueTest(models.Model):
generic_v4unpack_ip = models.GenericIPAddressField(
null=True, blank=True, unique=True, unpack_ipv4=True
)
class UniqueFuncConstraintModel(models.Model):
field = models.CharField(max_length=255)
class Meta:
required_db_features = {"supports_expression_indexes"}
constraints = [
models.UniqueConstraint(Lower("field"), name="func_lower_field_uq"),
]
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