django-rest-framework/tests/test_multitable_inheritance.py

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from django.db import models
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from django.test import TestCase
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from rest_framework import serializers
from tests.models import RESTFrameworkModel
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# Models
class ParentModel(RESTFrameworkModel):
name1 = models.CharField(max_length=100)
class ChildModel(ParentModel):
name2 = models.CharField(max_length=100)
class AssociatedModel(RESTFrameworkModel):
ref = models.OneToOneField(ParentModel, primary_key=True, on_delete=models.CASCADE)
name = models.CharField(max_length=100)
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# Serializers
class DerivedModelSerializer(serializers.ModelSerializer):
class Meta:
model = ChildModel
fields = '__all__'
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class AssociatedModelSerializer(serializers.ModelSerializer):
class Meta:
model = AssociatedModel
fields = '__all__'
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# Tests
class InheritedModelSerializationTests(TestCase):
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def test_multitable_inherited_model_fields_as_expected(self):
"""
Assert that the parent pointer field is not included in the fields
serialized fields
"""
child = ChildModel(name1='parent name', name2='child name')
serializer = DerivedModelSerializer(child)
assert set(serializer.data) == {'name1', 'name2', 'id'}
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def test_onetoone_primary_key_model_fields_as_expected(self):
"""
Assert that a model with a onetoone field that is the primary key is
not treated like a derived model
"""
parent = ParentModel.objects.create(name1='parent name')
associate = AssociatedModel.objects.create(name='hello', ref=parent)
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serializer = AssociatedModelSerializer(associate)
assert set(serializer.data) == {'name', 'ref'}
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def test_data_is_valid_without_parent_ptr(self):
"""
Assert that the pointer to the parent table is not a required field
for input data
"""
data = {
'name1': 'parent name',
'name2': 'child name',
}
serializer = DerivedModelSerializer(data=data)
assert serializer.is_valid() is True