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diff --git a/tests/serializers_regress/models.py b/tests/serializers_regress/models.py
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+"""
+A test spanning all the capabilities of all the serializers.
+
+This class sets up a model for each model field type
+(except for image types, because of the PIL dependency).
+"""
+
+from django.db import models
+from django.contrib.contenttypes import generic
+from django.contrib.contenttypes.models import ContentType
+
+# The following classes are for testing basic data
+# marshalling, including NULL values, where allowed.
+
+class BooleanData(models.Model):
+    data = models.BooleanField()
+
+class CharData(models.Model):
+    data = models.CharField(max_length=30, null=True)
+
+class DateData(models.Model):
+    data = models.DateField(null=True)
+
+class DateTimeData(models.Model):
+    data = models.DateTimeField(null=True)
+
+class DecimalData(models.Model):
+    data = models.DecimalField(null=True, decimal_places=3, max_digits=5)
+
+class EmailData(models.Model):
+    data = models.EmailField(null=True)
+
+class FileData(models.Model):
+    data = models.FileField(null=True, upload_to='/foo/bar')
+
+class FilePathData(models.Model):
+    data = models.FilePathField(null=True)
+
+class FloatData(models.Model):
+    data = models.FloatField(null=True)
+
+class IntegerData(models.Model):
+    data = models.IntegerField(null=True)
+
+class BigIntegerData(models.Model):
+    data = models.BigIntegerField(null=True)
+
+# class ImageData(models.Model):
+#    data = models.ImageField(null=True)
+
+class IPAddressData(models.Model):
+    data = models.IPAddressField(null=True)
+
+class GenericIPAddressData(models.Model):
+    data = models.GenericIPAddressField(null=True)
+
+class NullBooleanData(models.Model):
+    data = models.NullBooleanField(null=True)
+
+class PositiveIntegerData(models.Model):
+    data = models.PositiveIntegerField(null=True)
+
+class PositiveSmallIntegerData(models.Model):
+    data = models.PositiveSmallIntegerField(null=True)
+
+class SlugData(models.Model):
+    data = models.SlugField(null=True)
+
+class SmallData(models.Model):
+    data = models.SmallIntegerField(null=True)
+
+class TextData(models.Model):
+    data = models.TextField(null=True)
+
+class TimeData(models.Model):
+    data = models.TimeField(null=True)
+
+class Tag(models.Model):
+    """A tag on an item."""
+    data = models.SlugField()
+    content_type = models.ForeignKey(ContentType)
+    object_id = models.PositiveIntegerField()
+
+    content_object = generic.GenericForeignKey()
+
+    class Meta:
+        ordering = ["data"]
+
+class GenericData(models.Model):
+    data = models.CharField(max_length=30)
+
+    tags = generic.GenericRelation(Tag)
+
+# The following test classes are all for validation
+# of related objects; in particular, forward, backward,
+# and self references.
+
+class Anchor(models.Model):
+    """This is a model that can be used as
+    something for other models to point at"""
+
+    data = models.CharField(max_length=30)
+
+    class Meta:
+        ordering = ('id',)
+
+class NaturalKeyAnchorManager(models.Manager):
+    def get_by_natural_key(self, data):
+        return self.get(data=data)
+
+class NaturalKeyAnchor(models.Model):
+    objects = NaturalKeyAnchorManager()
+
+    data = models.CharField(max_length=100, unique=True)
+
+    def natural_key(self):
+        return (self.data,)
+
+class UniqueAnchor(models.Model):
+    """This is a model that can be used as
+    something for other models to point at"""
+
+    data = models.CharField(unique=True, max_length=30)
+
+class FKData(models.Model):
+    data = models.ForeignKey(Anchor, null=True)
+
+class FKDataNaturalKey(models.Model):
+    data = models.ForeignKey(NaturalKeyAnchor, null=True)
+
+class M2MData(models.Model):
+    data = models.ManyToManyField(Anchor, null=True)
+
+class O2OData(models.Model):
+    # One to one field can't be null here, since it is a PK.
+    data = models.OneToOneField(Anchor, primary_key=True)
+
+class FKSelfData(models.Model):
+    data = models.ForeignKey('self', null=True)
+
+class M2MSelfData(models.Model):
+    data = models.ManyToManyField('self', null=True, symmetrical=False)
+
+class FKDataToField(models.Model):
+    data = models.ForeignKey(UniqueAnchor, null=True, to_field='data')
+
+class FKDataToO2O(models.Model):
+    data = models.ForeignKey(O2OData, null=True)
+
+class M2MIntermediateData(models.Model):
+    data = models.ManyToManyField(Anchor, null=True, through='Intermediate')
+
+class Intermediate(models.Model):
+    left = models.ForeignKey(M2MIntermediateData)
+    right = models.ForeignKey(Anchor)
+    extra = models.CharField(max_length=30, blank=True, default="doesn't matter")
+
+# The following test classes are for validating the
+# deserialization of objects that use a user-defined
+# field as the primary key.
+# Some of these data types have been commented out
+# because they can't be used as a primary key on one
+# or all database backends.
+
+class BooleanPKData(models.Model):
+    data = models.BooleanField(primary_key=True)
+
+class CharPKData(models.Model):
+    data = models.CharField(max_length=30, primary_key=True)
+
+# class DatePKData(models.Model):
+#    data = models.DateField(primary_key=True)
+
+# class DateTimePKData(models.Model):
+#    data = models.DateTimeField(primary_key=True)
+
+class DecimalPKData(models.Model):
+    data = models.DecimalField(primary_key=True, decimal_places=3, max_digits=5)
+
+class EmailPKData(models.Model):
+    data = models.EmailField(primary_key=True)
+
+# class FilePKData(models.Model):
+#    data = models.FileField(primary_key=True, upload_to='/foo/bar')
+
+class FilePathPKData(models.Model):
+    data = models.FilePathField(primary_key=True)
+
+class FloatPKData(models.Model):
+    data = models.FloatField(primary_key=True)
+
+class IntegerPKData(models.Model):
+    data = models.IntegerField(primary_key=True)
+
+# class ImagePKData(models.Model):
+#    data = models.ImageField(primary_key=True)
+
+class IPAddressPKData(models.Model):
+    data = models.IPAddressField(primary_key=True)
+
+class GenericIPAddressPKData(models.Model):
+    data = models.GenericIPAddressField(primary_key=True)
+
+# This is just a Boolean field with null=True, and we can't test a PK value of NULL.
+# class NullBooleanPKData(models.Model):
+#     data = models.NullBooleanField(primary_key=True)
+
+class PositiveIntegerPKData(models.Model):
+    data = models.PositiveIntegerField(primary_key=True)
+
+class PositiveSmallIntegerPKData(models.Model):
+    data = models.PositiveSmallIntegerField(primary_key=True)
+
+class SlugPKData(models.Model):
+    data = models.SlugField(primary_key=True)
+
+class SmallPKData(models.Model):
+    data = models.SmallIntegerField(primary_key=True)
+
+# class TextPKData(models.Model):
+#     data = models.TextField(primary_key=True)
+
+# class TimePKData(models.Model):
+#    data = models.TimeField(primary_key=True)
+
+class ComplexModel(models.Model):
+    field1 = models.CharField(max_length=10)
+    field2 = models.CharField(max_length=10)
+    field3 = models.CharField(max_length=10)
+
+# Tests for handling fields with pre_save functions, or
+# models with save functions that modify data
+class AutoNowDateTimeData(models.Model):
+    data = models.DateTimeField(null=True, auto_now=True)
+
+class ModifyingSaveData(models.Model):
+    data = models.IntegerField(null=True)
+
+    def save(self):
+        "A save method that modifies the data in the object"
+        self.data = 666
+        super(ModifyingSaveData, self).save(raw)
+
+# Tests for serialization of models using inheritance.
+# Regression for #7202, #7350
+class AbstractBaseModel(models.Model):
+    parent_data = models.IntegerField()
+    class Meta:
+        abstract = True
+
+class InheritAbstractModel(AbstractBaseModel):
+    child_data = models.IntegerField()
+
+class BaseModel(models.Model):
+    parent_data = models.IntegerField()
+
+class InheritBaseModel(BaseModel):
+    child_data = models.IntegerField()
+
+class ExplicitInheritBaseModel(BaseModel):
+    parent = models.OneToOneField(BaseModel)
+    child_data = models.IntegerField()
+
+class ProxyBaseModel(BaseModel):
+    class Meta:
+        proxy = True
+
+class ProxyProxyBaseModel(ProxyBaseModel):
+    class Meta:
+        proxy = True
+
+class LengthModel(models.Model):
+    data = models.IntegerField()
+
+    def __len__(self):
+        return self.data
+