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4608d34b34
When all values of a field with a db_default are DatabaseDefault, which is the case most of the time, there is no point in specifying explicit DEFAULT for all INSERT VALUES as that's what the database will do anyway if not specified. In the case of PostgreSQL doing so can even be harmful as it prevents the usage of the UNNEST strategy and in the case of Oracle, which doesn't support the usage of the DEFAULT keyword, it unnecessarily requires providing literal db defaults. Thanks Lily Foote for the review.
173 lines
4.5 KiB
Python
173 lines
4.5 KiB
Python
from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
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from django.contrib.contenttypes.models import ContentType
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from django.db import models
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class Square(models.Model):
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root = models.IntegerField()
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square = models.PositiveIntegerField(db_default=9)
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def __str__(self):
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return "%s ** 2 == %s" % (self.root, self.square)
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class Person(models.Model):
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first_name = models.CharField(max_length=20)
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last_name = models.CharField(max_length=20)
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def __str__(self):
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return "%s %s" % (self.first_name, self.last_name)
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class SchoolClassManager(models.Manager):
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def get_queryset(self):
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return super().get_queryset().exclude(year=1000)
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class SchoolClass(models.Model):
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year = models.PositiveIntegerField()
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day = models.CharField(max_length=9, blank=True)
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last_updated = models.DateTimeField()
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objects = SchoolClassManager()
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class SchoolBusManager(models.Manager):
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def get_queryset(self):
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return super().get_queryset().prefetch_related("schoolclasses")
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class SchoolBus(models.Model):
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number = models.IntegerField()
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schoolclasses = models.ManyToManyField("SchoolClass")
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objects = SchoolBusManager()
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class Meta:
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base_manager_name = "objects"
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class VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ(models.Model):
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primary_key_is_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.AutoField(
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primary_key=True
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)
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charfield_is_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.CharField(
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max_length=100
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)
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m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = (
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models.ManyToManyField(Person, blank=True)
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)
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class Tag(models.Model):
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name = models.CharField(max_length=30)
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content_type = models.ForeignKey(
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ContentType, models.CASCADE, related_name="backend_tags"
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)
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object_id = models.PositiveIntegerField()
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content_object = GenericForeignKey("content_type", "object_id")
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class Post(models.Model):
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name = models.CharField(max_length=30)
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text = models.TextField()
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tags = GenericRelation("Tag")
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class Meta:
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db_table = "CaseSensitive_Post"
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class Reporter(models.Model):
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first_name = models.CharField(max_length=30)
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last_name = models.CharField(max_length=30)
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def __str__(self):
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return "%s %s" % (self.first_name, self.last_name)
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class ReporterProxy(Reporter):
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class Meta:
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proxy = True
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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.DateField()
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reporter = models.ForeignKey(Reporter, models.CASCADE)
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reporter_proxy = models.ForeignKey(
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ReporterProxy,
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models.SET_NULL,
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null=True,
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related_name="reporter_proxy",
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)
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def __str__(self):
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return self.headline
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class Item(models.Model):
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name = models.CharField(max_length=30)
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date = models.DateField()
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time = models.TimeField()
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last_modified = models.DateTimeField()
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def __str__(self):
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return self.name
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class Object(models.Model):
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related_objects = models.ManyToManyField(
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"self", db_constraint=False, symmetrical=False
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)
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obj_ref = models.ForeignKey("ObjectReference", models.CASCADE, null=True)
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def __str__(self):
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return str(self.id)
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class ObjectReference(models.Model):
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obj = models.ForeignKey(Object, models.CASCADE, db_constraint=False)
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def __str__(self):
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return str(self.obj_id)
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class ObjectSelfReference(models.Model):
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key = models.CharField(max_length=3, unique=True)
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obj = models.ForeignKey("ObjectSelfReference", models.SET_NULL, null=True)
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class CircularA(models.Model):
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key = models.CharField(max_length=3, unique=True)
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obj = models.ForeignKey("CircularB", models.SET_NULL, null=True)
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def natural_key(self):
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return (self.key,)
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class CircularB(models.Model):
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key = models.CharField(max_length=3, unique=True)
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obj = models.ForeignKey("CircularA", models.SET_NULL, null=True)
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def natural_key(self):
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return (self.key,)
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class RawData(models.Model):
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raw_data = models.BinaryField()
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class Author(models.Model):
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name = models.CharField(max_length=255, unique=True)
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class Book(models.Model):
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author = models.ForeignKey(Author, models.CASCADE, to_field="name")
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class SQLKeywordsModel(models.Model):
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id = models.AutoField(primary_key=True, db_column="select")
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reporter = models.ForeignKey(Reporter, models.CASCADE, db_column="where")
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class Meta:
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db_table = "order"
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