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from django.db import models
class City(models.Model):
id = models.BigAutoField(primary_key=True)
name = models.CharField(max_length=50)
class Country(models.Model):
id = models.SmallAutoField(primary_key=True)
name = models.CharField(max_length=50)
class District(models.Model):
city = models.ForeignKey(City, models.CASCADE, primary_key=True)
name = models.CharField(max_length=50)
class Reporter(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=30)
email = models.EmailField()
facebook_user_id = models.BigIntegerField(null=True)
raw_data = models.BinaryField(null=True)
small_int = models.SmallIntegerField()
interval = models.DurationField()
class Meta:
unique_together = ("first_name", "last_name")
class Article(models.Model):
headline = models.CharField(max_length=100)
pub_date = models.DateField()
body = models.TextField(default="")
reporter = models.ForeignKey(Reporter, models.CASCADE)
response_to = models.ForeignKey("self", models.SET_NULL, null=True)
unmanaged_reporters = models.ManyToManyField(
Reporter, through="ArticleReporter", related_name="+"
)
class Meta:
ordering = ("headline",)
indexes = [
models.Index(fields=["headline", "pub_date"]),
models.Index(fields=["headline", "response_to", "pub_date", "reporter"]),
]
class ArticleReporter(models.Model):
article = models.ForeignKey(Article, models.CASCADE)
reporter = models.ForeignKey(Reporter, models.CASCADE)
class Meta:
managed = False
class Comment(models.Model):
ref = models.UUIDField(unique=True)
article = models.ForeignKey(Article, models.CASCADE, db_index=True)
email = models.EmailField()
pub_date = models.DateTimeField()
body = models.TextField()
class Meta:
constraints = [
models.UniqueConstraint(
fields=["article", "email", "pub_date"],
name="article_email_pub_date_uniq",
),
]
indexes = [
models.Index(fields=["email", "pub_date"], name="email_pub_date_idx"),
]
class CheckConstraintModel(models.Model):
up_votes = models.PositiveIntegerField()
voting_number = models.PositiveIntegerField(unique=True)
class Meta:
required_db_features = {
"supports_table_check_constraints",
}
constraints = [
models.CheckConstraint(
name="up_votes_gte_0_check", condition=models.Q(up_votes__gte=0)
),
]
class UniqueConstraintConditionModel(models.Model):
name = models.CharField(max_length=255)
color = models.CharField(max_length=32, null=True)
class Meta:
required_db_features = {"supports_partial_indexes"}
constraints = [
models.UniqueConstraint(
fields=["name"],
name="cond_name_without_color_uniq",
condition=models.Q(color__isnull=True),
),
]
class DbCommentModel(models.Model):
name = models.CharField(max_length=15, db_comment="'Name' column comment")
class Meta:
db_table_comment = "Custom table comment"
required_db_features = {"supports_comments"}
class DbOnDeleteCascadeModel(models.Model):
fk_do_nothing = models.ForeignKey(Country, on_delete=models.DO_NOTHING)
fk_db_cascade = models.ForeignKey(City, on_delete=models.DB_CASCADE)
class Meta:
required_db_features = {"supports_on_delete_db_cascade"}
class DbOnDeleteSetNullModel(models.Model):
fk_set_null = models.ForeignKey(Reporter, on_delete=models.DB_SET_NULL, null=True)
class Meta:
required_db_features = {"supports_on_delete_db_null"}
class DbOnDeleteSetDefaultModel(models.Model):
fk_db_set_default = models.ForeignKey(
Country, on_delete=models.DB_SET_DEFAULT, db_default=models.Value(1)
)
class Meta:
required_db_features = {"supports_on_delete_db_default"}
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