2006-05-02 01:31:56 +00:00
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"""
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2014-09-24 05:13:13 +00:00
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The lookup API
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2006-05-02 01:31:56 +00:00
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This demonstrates features of the database API.
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"""
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2011-07-13 09:35:51 +00:00
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from django.db import models
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2018-02-20 15:47:12 +00:00
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from django.db.models.lookups import IsNull
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2006-05-02 01:31:56 +00:00
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2011-10-13 18:04:12 +00:00
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2015-05-22 19:16:26 +00:00
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class Alarm(models.Model):
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desc = models.CharField(max_length=100)
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time = models.TimeField()
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def __str__(self):
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return "%s (%s)" % (self.time, self.desc)
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2013-06-10 10:24:45 +00:00
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class Author(models.Model):
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name = models.CharField(max_length=100)
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2018-03-14 09:00:07 +00:00
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alias = models.CharField(max_length=50, null=True, blank=True)
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2013-10-22 10:21:07 +00:00
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2013-06-10 10:24:45 +00:00
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class Meta:
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2017-12-28 20:07:29 +00:00
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ordering = ("name",)
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2013-06-10 10:24:45 +00:00
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2013-11-03 04:36:09 +00:00
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2013-06-10 10:24:45 +00:00
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class Article(models.Model):
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headline = models.CharField(max_length=100)
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pub_date = models.DateTimeField()
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2015-07-22 14:43:21 +00:00
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author = models.ForeignKey(Author, models.SET_NULL, blank=True, null=True)
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2017-03-28 15:57:23 +00:00
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slug = models.SlugField(unique=True, blank=True, null=True)
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2013-10-22 10:21:07 +00:00
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2013-06-10 10:24:45 +00:00
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class Meta:
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ordering = ("-pub_date", "headline")
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def __str__(self):
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return self.headline
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2010-11-21 02:28:25 +00:00
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2013-11-03 04:36:09 +00:00
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2010-11-21 02:28:25 +00:00
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class Tag(models.Model):
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2013-06-10 10:24:45 +00:00
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articles = models.ManyToManyField(Article)
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2010-11-21 02:28:25 +00:00
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name = models.CharField(max_length=100)
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2013-10-22 10:21:07 +00:00
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2010-11-21 02:28:25 +00:00
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class Meta:
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2017-12-28 20:07:29 +00:00
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ordering = ("name",)
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2012-02-05 07:11:53 +00:00
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2013-11-03 04:36:09 +00:00
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2017-07-30 20:01:45 +00:00
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class NulledTextField(models.TextField):
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2017-07-30 17:00:00 +00:00
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def get_prep_value(self, value):
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return None if value == "" else value
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2017-07-30 20:01:45 +00:00
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2022-12-16 11:24:49 +00:00
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class NullField(models.Field):
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pass
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NullField.register_lookup(IsNull)
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2017-07-30 20:01:45 +00:00
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@NulledTextField.register_lookup
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class NulledTransform(models.Transform):
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lookup_name = "nulled"
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template = "NULL"
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2022-12-16 11:24:49 +00:00
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@property
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def output_field(self):
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return NullField()
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2017-07-30 20:01:45 +00:00
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2018-02-20 15:47:12 +00:00
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@NulledTextField.register_lookup
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class IsNullWithNoneAsRHS(IsNull):
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lookup_name = "isnull_none_rhs"
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can_use_none_as_rhs = True
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2012-02-05 07:11:53 +00:00
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class Season(models.Model):
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year = models.PositiveSmallIntegerField()
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gt = models.IntegerField(null=True, blank=True)
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2017-07-30 20:01:45 +00:00
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nulled_text_field = NulledTextField(null=True)
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2012-02-05 07:11:53 +00:00
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2020-04-22 09:36:03 +00:00
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class Meta:
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constraints = [
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models.UniqueConstraint(fields=["year"], name="season_year_unique"),
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]
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2012-08-12 10:32:08 +00:00
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def __str__(self):
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2016-12-29 15:27:49 +00:00
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return str(self.year)
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2012-02-05 07:11:53 +00:00
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2013-11-03 04:36:09 +00:00
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2012-02-05 07:11:53 +00:00
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class Game(models.Model):
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2015-07-22 14:43:21 +00:00
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season = models.ForeignKey(Season, models.CASCADE, related_name="games")
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2012-02-05 07:11:53 +00:00
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home = models.CharField(max_length=100)
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away = models.CharField(max_length=100)
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2013-11-03 04:36:09 +00:00
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2012-02-05 07:11:53 +00:00
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class Player(models.Model):
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name = models.CharField(max_length=100)
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games = models.ManyToManyField(Game, related_name="players")
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2014-04-22 20:01:16 +00:00
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2016-12-10 18:05:34 +00:00
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class Product(models.Model):
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name = models.CharField(max_length=80)
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qty_target = models.DecimalField(max_digits=6, decimal_places=2)
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class Stock(models.Model):
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product = models.ForeignKey(Product, models.CASCADE)
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2021-04-22 17:44:25 +00:00
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short = models.BooleanField(default=False)
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2016-12-10 18:05:34 +00:00
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qty_available = models.DecimalField(max_digits=6, decimal_places=2)
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2019-10-11 18:10:31 +00:00
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class Freebie(models.Model):
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gift_product = models.ForeignKey(Product, models.CASCADE)
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stock_id = models.IntegerField(blank=True, null=True)
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stock = models.ForeignObject(
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Stock,
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from_fields=["stock_id", "gift_product"],
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to_fields=["id", "product"],
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on_delete=models.CASCADE,
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)
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