"""

Various edge-cases for model managers.

"""

from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation

from django.contrib.contenttypes.models import ContentType

from django.db import models

class OnlyFred(models.Manager):

    def get_queryset(self):

        return super().get_queryset().filter(name="fred")

class OnlyBarney(models.Manager):

    def get_queryset(self):

        return super().get_queryset().filter(name="barney")

class Value42(models.Manager):

    def get_queryset(self):

        return super().get_queryset().filter(value=42)

class AbstractBase1(models.Model):

    name = models.CharField(max_length=50)

    class Meta:

        abstract = True

    # Custom managers

    manager1 = OnlyFred()

    manager2 = OnlyBarney()

    objects = models.Manager()

class AbstractBase2(models.Model):

    value = models.IntegerField()

    class Meta:

        abstract = True

    # Custom manager

    restricted = Value42()

# No custom manager on this class to make sure the default case doesn't break.

class AbstractBase3(models.Model):

    comment = models.CharField(max_length=50)

    class Meta:

        abstract = True

class Parent(models.Model):

    name = models.CharField(max_length=50)

    manager = OnlyFred()

    def __str__(self):

        return self.name

# Managers from base classes are inherited and, if no manager is specified

# *and* the parent has a manager specified, the first one (in the MRO) will

# become the default.

class Child1(AbstractBase1):

    data = models.CharField(max_length=25)

    def __str__(self):

        return self.data

class Child2(AbstractBase1, AbstractBase2):

    data = models.CharField(max_length=25)

    def __str__(self):

        return self.data

class Child3(AbstractBase1, AbstractBase3):

    data = models.CharField(max_length=25)

    def __str__(self):

        return self.data

class Child4(AbstractBase1):

    data = models.CharField(max_length=25)

    # Should be the default manager, although the parent managers are

    # inherited.

    default = models.Manager()

    def __str__(self):

        return self.data

class Child5(AbstractBase3):

    name = models.CharField(max_length=25)

    default = OnlyFred()

    objects = models.Manager()

    def __str__(self):

        return self.name

class Child6(Child4):

    value = models.IntegerField()

class Child7(Parent):

    objects = models.Manager()

# RelatedManagers

class RelatedModel(models.Model):

    test_gfk = GenericRelation(

        "RelationModel", content_type_field="gfk_ctype", object_id_field="gfk_id"

    )

    exact = models.BooleanField(null=True)

    def __str__(self):

        return str(self.pk)

class RelationModel(models.Model):

    fk = models.ForeignKey(RelatedModel, models.CASCADE, related_name="test_fk")

    m2m = models.ManyToManyField(RelatedModel, related_name="test_m2m")

    gfk_ctype = models.ForeignKey(ContentType, models.SET_NULL, null=True)

    gfk_id = models.IntegerField(null=True)

    gfk = GenericForeignKey(ct_field="gfk_ctype", fk_field="gfk_id")

    def __str__(self):

        return str(self.pk)