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from uuid import uuid4
from django.db import models
from django.db.models import Field
from django.db.models.query import QuerySet
import mptt
from mptt.fields import TreeForeignKey, TreeManyToManyField, TreeOneToOneField
from mptt.managers import TreeManager
from mptt.models import MPTTModel
class CustomTreeQueryset(QuerySet):
def custom_method(self):
pass
class CustomTreeManager(TreeManager):
def get_queryset(self):
return CustomTreeQueryset(model=self.model, using=self._db)
class Category(MPTTModel):
name = models.CharField(max_length=50)
visible = models.BooleanField(default=True)
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
category_uuid = models.CharField(max_length=50, unique=True, null=True)
def __str__(self):
return self.name
def delete(self):
super().delete()
delete.alters_data = True
class Item(models.Model):
name = models.CharField(max_length=100)
category_fk = models.ForeignKey(
"Category",
to_field="category_uuid",
null=True,
related_name="items_by_fk",
on_delete=models.CASCADE,
)
category_pk = models.ForeignKey(
"Category", null=True, related_name="items_by_pk", on_delete=models.CASCADE
)
def __str__(self):
return self.name
class SubItem(models.Model):
item = models.ForeignKey(Item, null=True, on_delete=models.CASCADE)
class Genre(MPTTModel):
name = models.CharField(max_length=50, unique=True)
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
def __str__(self):
return self.name
class Game(models.Model):
genre = TreeForeignKey(Genre, on_delete=models.CASCADE)
genres_m2m = models.ManyToManyField(Genre, related_name="games_m2m")
name = models.CharField(max_length=50)
def __str__(self):
return self.name
class Insert(MPTTModel):
parent = models.ForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
class MultiOrder(MPTTModel):
name = models.CharField(max_length=50)
size = models.PositiveIntegerField()
date = models.DateField()
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
class MPTTMeta:
order_insertion_by = ["name", "size", "-date"]
def __str__(self):
return self.name
class Node(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
# To check that you can set level_attr etc to an existing field.
level = models.IntegerField()
class MPTTMeta:
left_attr = "does"
right_attr = "zis"
level_attr = "level"
tree_id_attr = "work"
class UUIDNode(MPTTModel):
parent = models.ForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
uuid = models.UUIDField(primary_key=True, default=uuid4)
name = models.CharField(max_length=50)
def __str__(self):
return self.name
class OrderedInsertion(MPTTModel):
name = models.CharField(max_length=50)
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
class MPTTMeta:
order_insertion_by = ["name"]
def __str__(self):
return self.name
class Tree(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
class NewStyleMPTTMeta(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
class MPTTMeta:
left_attr = "testing"
class Person(MPTTModel):
name = models.CharField(max_length=50)
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
# just testing it's actually possible to override the tree manager
objects = CustomTreeManager()
def __str__(self):
return self.name
class Student(Person):
type = models.CharField(max_length=50)
class CustomPKName(MPTTModel):
my_id = models.AutoField(db_column="my_custom_name", primary_key=True)
name = models.CharField(max_length=50)
parent = TreeForeignKey(
"self",
null=True,
blank=True,
related_name="children",
db_column="my_cusom_parent",
on_delete=models.CASCADE,
)
def __str__(self):
return self.name
class ReferencingModel(models.Model):
fk = TreeForeignKey(Category, related_name="+", on_delete=models.CASCADE)
one = TreeOneToOneField(Category, related_name="+", on_delete=models.CASCADE)
m2m = TreeManyToManyField(Category, related_name="+")
# for testing various types of inheritance:
# 1. multi-table inheritance, with mptt fields on base class.
class MultiTableInheritanceA1(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
class MultiTableInheritanceA2(MultiTableInheritanceA1):
name = models.CharField(max_length=50)
# 2. multi-table inheritance, with mptt fields on child class.
class MultiTableInheritanceB1(MPTTModel):
name = models.CharField(max_length=50)
class MultiTableInheritanceB2(MultiTableInheritanceB1):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
# 3. abstract models
class AbstractModel(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
ghosts = models.CharField(max_length=50)
class Meta:
abstract = True
class ConcreteModel(AbstractModel):
name = models.CharField(max_length=50)
class AbstractConcreteAbstract(ConcreteModel):
# abstract --> concrete --> abstract
class Meta:
abstract = True
class ConcreteAbstractConcreteAbstract(ConcreteModel):
# concrete --> abstract --> concrete --> abstract
pass
class ConcreteConcrete(ConcreteModel):
# another subclass (concrete this time) of the root concrete model
pass
# 4. proxy models
class SingleProxyModel(ConcreteModel):
objects = CustomTreeManager()
class Meta:
proxy = True
class DoubleProxyModel(SingleProxyModel):
class Meta:
proxy = True
# 5. swappable models
class SwappableModel(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
class Meta:
swappable = "MPTT_SWAPPABLE_MODEL"
class SwappedInModel(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
name = models.CharField(max_length=50)
# Default manager
class MultipleManager(TreeManager):
def get_queryset(self):
return super().get_queryset().exclude(published=False)
class MultipleManagerModel(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
published = models.BooleanField()
objects = TreeManager()
foo_objects = MultipleManager()
class AutoNowDateFieldModel(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
now = models.DateTimeField(auto_now_add=True)
class MPTTMeta:
order_insertion_by = ("now",)
# test registering of remote model
class Group(models.Model):
name = models.CharField(max_length=100)
TreeForeignKey(
Group, blank=True, null=True, on_delete=models.CASCADE
).contribute_to_class(Group, "parent")
mptt.register(Group, order_insertion_by=("name",))
class Book(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
name = models.CharField(max_length=50)
fk = TreeForeignKey(
Category,
null=True,
blank=True,
related_name="books_fk",
on_delete=models.CASCADE,
)
m2m = TreeManyToManyField(Category, blank=True, related_name="books_m2m")
class UniqueTogetherModel(MPTTModel):
class Meta:
unique_together = (
(
"parent",
"code",
),
)
parent = TreeForeignKey("self", null=True, on_delete=models.CASCADE)
code = models.CharField(max_length=10)
class NullableOrderedInsertionModel(MPTTModel):
name = models.CharField(max_length=50, null=True)
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
class MPTTMeta:
order_insertion_by = ["name"]
def __str__(self):
return self.name
class NullableDescOrderedInsertionModel(MPTTModel):
name = models.CharField(max_length=50, null=True)
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
class MPTTMeta:
order_insertion_by = ["-name"]
def __str__(self):
return self.name
class FakeNotConcreteField(Field):
"""Returning None as column results in the field being not concrete"""
def get_attname_column(self):
return self.name, None
class NotConcreteFieldModel(MPTTModel):
parent = TreeForeignKey(
"self", null=True, blank=True, related_name="children", on_delete=models.CASCADE
)
not_concrete_field = FakeNotConcreteField()
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