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170b006ce8
Regression in 3a505c70e7.
Nonlitteral right-hand-sides of lookups need to be wrapped in
parentheses to avoid operator precedence ambiguities.
Thanks Charles Lirsac for the detailed report.
111 lines
2.7 KiB
Python
111 lines
2.7 KiB
Python
"""
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The lookup API
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This demonstrates features of the database API.
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"""
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from django.db import models
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from django.db.models.lookups import IsNull
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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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class Author(models.Model):
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name = models.CharField(max_length=100)
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alias = models.CharField(max_length=50, null=True, blank=True)
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class Meta:
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ordering = ('name',)
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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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author = models.ForeignKey(Author, models.SET_NULL, blank=True, null=True)
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slug = models.SlugField(unique=True, blank=True, null=True)
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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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class Tag(models.Model):
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articles = models.ManyToManyField(Article)
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name = models.CharField(max_length=100)
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class Meta:
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ordering = ('name',)
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class NulledTextField(models.TextField):
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def get_prep_value(self, value):
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return None if value == '' else value
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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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@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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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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nulled_text_field = NulledTextField(null=True)
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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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def __str__(self):
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return str(self.year)
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class Game(models.Model):
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season = models.ForeignKey(Season, models.CASCADE, related_name='games')
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home = models.CharField(max_length=100)
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away = models.CharField(max_length=100)
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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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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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short = models.BooleanField(default=False)
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qty_available = models.DecimalField(max_digits=6, decimal_places=2)
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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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