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089162e6e3
* Fix ModelSerializer unique_together field sources Updates ModelSerializer to check for serializer fields that map to the model field sources in the unique_together lists. * Ensure field name ordering consistency
678 lines
24 KiB
Python
678 lines
24 KiB
Python
import datetime
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import pytest
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from django.db import DataError, models
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from django.test import TestCase
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from rest_framework import serializers
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from rest_framework.exceptions import ValidationError
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from rest_framework.validators import (
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BaseUniqueForValidator, UniqueTogetherValidator, UniqueValidator,
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qs_exists
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)
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def dedent(blocktext):
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return '\n'.join([line[12:] for line in blocktext.splitlines()[1:-1]])
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# Tests for `UniqueValidator`
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# ---------------------------
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class UniquenessModel(models.Model):
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username = models.CharField(unique=True, max_length=100)
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class UniquenessSerializer(serializers.ModelSerializer):
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class Meta:
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model = UniquenessModel
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fields = '__all__'
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class RelatedModel(models.Model):
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user = models.OneToOneField(UniquenessModel, on_delete=models.CASCADE)
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email = models.CharField(unique=True, max_length=80)
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class RelatedModelSerializer(serializers.ModelSerializer):
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username = serializers.CharField(source='user.username',
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validators=[UniqueValidator(queryset=UniquenessModel.objects.all(), lookup='iexact')]) # NOQA
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class Meta:
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model = RelatedModel
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fields = ('username', 'email')
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class AnotherUniquenessModel(models.Model):
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code = models.IntegerField(unique=True)
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class AnotherUniquenessSerializer(serializers.ModelSerializer):
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class Meta:
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model = AnotherUniquenessModel
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fields = '__all__'
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class IntegerFieldModel(models.Model):
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integer = models.IntegerField()
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class UniquenessIntegerSerializer(serializers.Serializer):
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# Note that this field *deliberately* does not correspond with the model field.
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# This allows us to ensure that `ValueError`, `TypeError` or `DataError` etc
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# raised by a uniqueness check does not trigger a deceptive "this field is not unique"
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# validation failure.
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integer = serializers.CharField(validators=[UniqueValidator(queryset=IntegerFieldModel.objects.all())])
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class TestUniquenessValidation(TestCase):
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def setUp(self):
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self.instance = UniquenessModel.objects.create(username='existing')
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def test_repr(self):
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serializer = UniquenessSerializer()
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expected = dedent("""
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UniquenessSerializer():
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id = IntegerField(label='ID', read_only=True)
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username = CharField(max_length=100, validators=[<UniqueValidator(queryset=UniquenessModel.objects.all())>])
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""")
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assert repr(serializer) == expected
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def test_is_not_unique(self):
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data = {'username': 'existing'}
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serializer = UniquenessSerializer(data=data)
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assert not serializer.is_valid()
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assert serializer.errors == {'username': ['uniqueness model with this username already exists.']}
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def test_is_unique(self):
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data = {'username': 'other'}
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serializer = UniquenessSerializer(data=data)
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assert serializer.is_valid()
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assert serializer.validated_data == {'username': 'other'}
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def test_updated_instance_excluded(self):
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data = {'username': 'existing'}
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serializer = UniquenessSerializer(self.instance, data=data)
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assert serializer.is_valid()
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assert serializer.validated_data == {'username': 'existing'}
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def test_doesnt_pollute_model(self):
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instance = AnotherUniquenessModel.objects.create(code='100')
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serializer = AnotherUniquenessSerializer(instance)
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assert AnotherUniquenessModel._meta.get_field('code').validators == []
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# Accessing data shouldn't effect validators on the model
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serializer.data
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assert AnotherUniquenessModel._meta.get_field('code').validators == []
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def test_related_model_is_unique(self):
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data = {'username': 'Existing', 'email': 'new-email@example.com'}
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rs = RelatedModelSerializer(data=data)
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assert not rs.is_valid()
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assert rs.errors == {'username': ['This field must be unique.']}
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data = {'username': 'new-username', 'email': 'new-email@example.com'}
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rs = RelatedModelSerializer(data=data)
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assert rs.is_valid()
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def test_value_error_treated_as_not_unique(self):
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serializer = UniquenessIntegerSerializer(data={'integer': 'abc'})
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assert serializer.is_valid()
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# Tests for `UniqueTogetherValidator`
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# -----------------------------------
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class UniquenessTogetherModel(models.Model):
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race_name = models.CharField(max_length=100)
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position = models.IntegerField()
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class Meta:
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unique_together = ('race_name', 'position')
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class NullUniquenessTogetherModel(models.Model):
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"""
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Used to ensure that null values are not included when checking
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unique_together constraints.
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Ignoring items which have a null in any of the validated fields is the same
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behavior that database backends will use when they have the
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unique_together constraint added.
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Example case: a null position could indicate a non-finisher in the race,
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there could be many non-finishers in a race, but all non-NULL
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values *should* be unique against the given `race_name`.
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"""
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date_of_birth = models.DateField(null=True) # Not part of the uniqueness constraint
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race_name = models.CharField(max_length=100)
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position = models.IntegerField(null=True)
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class Meta:
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unique_together = ('race_name', 'position')
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class UniquenessTogetherSerializer(serializers.ModelSerializer):
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class Meta:
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model = UniquenessTogetherModel
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fields = '__all__'
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class NullUniquenessTogetherSerializer(serializers.ModelSerializer):
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class Meta:
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model = NullUniquenessTogetherModel
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fields = '__all__'
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class TestUniquenessTogetherValidation(TestCase):
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def setUp(self):
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self.instance = UniquenessTogetherModel.objects.create(
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race_name='example',
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position=1
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)
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UniquenessTogetherModel.objects.create(
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race_name='example',
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position=2
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)
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UniquenessTogetherModel.objects.create(
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race_name='other',
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position=1
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)
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def test_repr(self):
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serializer = UniquenessTogetherSerializer()
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expected = dedent("""
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UniquenessTogetherSerializer():
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id = IntegerField(label='ID', read_only=True)
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race_name = CharField(max_length=100, required=True)
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position = IntegerField(required=True)
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class Meta:
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validators = [<UniqueTogetherValidator(queryset=UniquenessTogetherModel.objects.all(), fields=('race_name', 'position'))>]
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""")
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assert repr(serializer) == expected
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def test_is_not_unique_together(self):
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"""
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Failing unique together validation should result in non field errors.
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"""
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data = {'race_name': 'example', 'position': 2}
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serializer = UniquenessTogetherSerializer(data=data)
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assert not serializer.is_valid()
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assert serializer.errors == {
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'non_field_errors': [
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'The fields race_name, position must make a unique set.'
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]
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}
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def test_is_unique_together(self):
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"""
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In a unique together validation, one field may be non-unique
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so long as the set as a whole is unique.
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"""
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data = {'race_name': 'other', 'position': 2}
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serializer = UniquenessTogetherSerializer(data=data)
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assert serializer.is_valid()
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assert serializer.validated_data == {
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'race_name': 'other',
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'position': 2
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}
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def test_updated_instance_excluded_from_unique_together(self):
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"""
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When performing an update, the existing instance does not count
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as a match against uniqueness.
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"""
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data = {'race_name': 'example', 'position': 1}
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serializer = UniquenessTogetherSerializer(self.instance, data=data)
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assert serializer.is_valid()
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assert serializer.validated_data == {
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'race_name': 'example',
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'position': 1
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}
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def test_unique_together_is_required(self):
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"""
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In a unique together validation, all fields are required.
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"""
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data = {'position': 2}
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serializer = UniquenessTogetherSerializer(data=data, partial=True)
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assert not serializer.is_valid()
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assert serializer.errors == {
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'race_name': ['This field is required.']
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}
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def test_ignore_excluded_fields(self):
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"""
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When model fields are not included in a serializer, then uniqueness
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validators should not be added for that field.
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"""
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class ExcludedFieldSerializer(serializers.ModelSerializer):
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class Meta:
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model = UniquenessTogetherModel
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fields = ('id', 'race_name',)
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serializer = ExcludedFieldSerializer()
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expected = dedent("""
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ExcludedFieldSerializer():
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id = IntegerField(label='ID', read_only=True)
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race_name = CharField(max_length=100)
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""")
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assert repr(serializer) == expected
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def test_ignore_read_only_fields(self):
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"""
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When serializer fields are read only, then uniqueness
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validators should not be added for that field.
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"""
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class ReadOnlyFieldSerializer(serializers.ModelSerializer):
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class Meta:
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model = UniquenessTogetherModel
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fields = ('id', 'race_name', 'position')
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read_only_fields = ('race_name',)
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serializer = ReadOnlyFieldSerializer()
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expected = dedent("""
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ReadOnlyFieldSerializer():
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id = IntegerField(label='ID', read_only=True)
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race_name = CharField(read_only=True)
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position = IntegerField(required=True)
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""")
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assert repr(serializer) == expected
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def test_read_only_fields_with_default(self):
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"""
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Special case of read_only + default DOES validate unique_together.
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"""
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class ReadOnlyFieldWithDefaultSerializer(serializers.ModelSerializer):
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race_name = serializers.CharField(max_length=100, read_only=True, default='example')
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class Meta:
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model = UniquenessTogetherModel
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fields = ('id', 'race_name', 'position')
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data = {'position': 2}
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serializer = ReadOnlyFieldWithDefaultSerializer(data=data)
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assert len(serializer.validators) == 1
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assert isinstance(serializer.validators[0], UniqueTogetherValidator)
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assert serializer.validators[0].fields == ('race_name', 'position')
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assert not serializer.is_valid()
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assert serializer.errors == {
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'non_field_errors': [
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'The fields race_name, position must make a unique set.'
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]
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}
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def test_read_only_fields_with_default_and_source(self):
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class ReadOnlySerializer(serializers.ModelSerializer):
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name = serializers.CharField(source='race_name', default='test', read_only=True)
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class Meta:
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model = UniquenessTogetherModel
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fields = ['name', 'position']
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validators = [
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UniqueTogetherValidator(
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queryset=UniquenessTogetherModel.objects.all(),
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fields=['name', 'position']
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)
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]
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serializer = ReadOnlySerializer(data={'position': 1})
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assert serializer.is_valid(raise_exception=True)
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def test_writeable_fields_with_source(self):
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class WriteableSerializer(serializers.ModelSerializer):
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name = serializers.CharField(source='race_name')
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class Meta:
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model = UniquenessTogetherModel
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fields = ['name', 'position']
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validators = [
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UniqueTogetherValidator(
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queryset=UniquenessTogetherModel.objects.all(),
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fields=['name', 'position']
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)
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]
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serializer = WriteableSerializer(data={'name': 'test', 'position': 1})
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assert serializer.is_valid(raise_exception=True)
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# Validation error should use seriazlier field name, not source
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serializer = WriteableSerializer(data={'position': 1})
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assert not serializer.is_valid()
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assert serializer.errors == {
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'name': [
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'This field is required.'
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]
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}
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def test_default_validator_with_fields_with_source(self):
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class TestSerializer(serializers.ModelSerializer):
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name = serializers.CharField(source='race_name')
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class Meta:
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model = UniquenessTogetherModel
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fields = ['name', 'position']
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serializer = TestSerializer()
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expected = dedent("""
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TestSerializer():
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name = CharField(source='race_name')
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position = IntegerField()
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class Meta:
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validators = [<UniqueTogetherValidator(queryset=UniquenessTogetherModel.objects.all(), fields=('name', 'position'))>]
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""")
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assert repr(serializer) == expected
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def test_default_validator_with_multiple_fields_with_same_source(self):
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class TestSerializer(serializers.ModelSerializer):
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name = serializers.CharField(source='race_name')
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other_name = serializers.CharField(source='race_name')
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class Meta:
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model = UniquenessTogetherModel
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fields = ['name', 'other_name', 'position']
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serializer = TestSerializer(data={
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'name': 'foo',
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'other_name': 'foo',
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'position': 1,
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})
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with pytest.raises(AssertionError) as excinfo:
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serializer.is_valid()
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expected = (
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"Unable to create `UniqueTogetherValidator` for "
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"`UniquenessTogetherModel.race_name` as `TestSerializer` has "
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"multiple fields (name, other_name) that map to this model field. "
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"Either remove the extra fields, or override `Meta.validators` "
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"with a `UniqueTogetherValidator` using the desired field names.")
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assert str(excinfo.value) == expected
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def test_allow_explict_override(self):
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"""
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Ensure validators can be explicitly removed..
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"""
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class NoValidatorsSerializer(serializers.ModelSerializer):
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class Meta:
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model = UniquenessTogetherModel
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fields = ('id', 'race_name', 'position')
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validators = []
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serializer = NoValidatorsSerializer()
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expected = dedent("""
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NoValidatorsSerializer():
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id = IntegerField(label='ID', read_only=True)
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race_name = CharField(max_length=100)
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position = IntegerField()
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""")
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assert repr(serializer) == expected
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def test_ignore_validation_for_null_fields(self):
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# None values that are on fields which are part of the uniqueness
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# constraint cause the instance to ignore uniqueness validation.
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NullUniquenessTogetherModel.objects.create(
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date_of_birth=datetime.date(2000, 1, 1),
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race_name='Paris Marathon',
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position=None
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)
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data = {
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'date': datetime.date(2000, 1, 1),
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'race_name': 'Paris Marathon',
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'position': None
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}
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serializer = NullUniquenessTogetherSerializer(data=data)
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assert serializer.is_valid()
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def test_do_not_ignore_validation_for_null_fields(self):
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# None values that are not on fields part of the uniqueness constraint
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# do not cause the instance to skip validation.
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NullUniquenessTogetherModel.objects.create(
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date_of_birth=datetime.date(2000, 1, 1),
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race_name='Paris Marathon',
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position=1
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)
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data = {'date': None, 'race_name': 'Paris Marathon', 'position': 1}
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serializer = NullUniquenessTogetherSerializer(data=data)
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assert not serializer.is_valid()
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def test_filter_queryset_do_not_skip_existing_attribute(self):
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"""
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filter_queryset should add value from existing instance attribute
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if it is not provided in attributes dict
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"""
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class MockQueryset:
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def filter(self, **kwargs):
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self.called_with = kwargs
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data = {'race_name': 'bar'}
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queryset = MockQueryset()
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serializer = UniquenessTogetherSerializer(instance=self.instance)
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validator = UniqueTogetherValidator(queryset, fields=('race_name',
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'position'))
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validator.filter_queryset(attrs=data, queryset=queryset, serializer=serializer)
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assert queryset.called_with == {'race_name': 'bar', 'position': 1}
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# Tests for `UniqueForDateValidator`
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# ----------------------------------
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class UniqueForDateModel(models.Model):
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slug = models.CharField(max_length=100, unique_for_date='published')
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published = models.DateField()
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class UniqueForDateSerializer(serializers.ModelSerializer):
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class Meta:
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model = UniqueForDateModel
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fields = '__all__'
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class TestUniquenessForDateValidation(TestCase):
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def setUp(self):
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self.instance = UniqueForDateModel.objects.create(
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slug='existing',
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published='2000-01-01'
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)
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def test_repr(self):
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serializer = UniqueForDateSerializer()
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expected = dedent("""
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UniqueForDateSerializer():
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id = IntegerField(label='ID', read_only=True)
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slug = CharField(max_length=100)
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published = DateField(required=True)
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class Meta:
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validators = [<UniqueForDateValidator(queryset=UniqueForDateModel.objects.all(), field='slug', date_field='published')>]
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""")
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assert repr(serializer) == expected
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def test_is_not_unique_for_date(self):
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"""
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Failing unique for date validation should result in field error.
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"""
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data = {'slug': 'existing', 'published': '2000-01-01'}
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serializer = UniqueForDateSerializer(data=data)
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assert not serializer.is_valid()
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assert serializer.errors == {
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'slug': ['This field must be unique for the "published" date.']
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}
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def test_is_unique_for_date(self):
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"""
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Passing unique for date validation.
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"""
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data = {'slug': 'existing', 'published': '2000-01-02'}
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serializer = UniqueForDateSerializer(data=data)
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assert serializer.is_valid()
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assert serializer.validated_data == {
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'slug': 'existing',
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'published': datetime.date(2000, 1, 2)
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}
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def test_updated_instance_excluded_from_unique_for_date(self):
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"""
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When performing an update, the existing instance does not count
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as a match against unique_for_date.
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"""
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data = {'slug': 'existing', 'published': '2000-01-01'}
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serializer = UniqueForDateSerializer(instance=self.instance, data=data)
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assert serializer.is_valid()
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assert serializer.validated_data == {
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'slug': 'existing',
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'published': datetime.date(2000, 1, 1)
|
|
}
|
|
|
|
# Tests for `UniqueForMonthValidator`
|
|
# ----------------------------------
|
|
|
|
|
|
class UniqueForMonthModel(models.Model):
|
|
slug = models.CharField(max_length=100, unique_for_month='published')
|
|
published = models.DateField()
|
|
|
|
|
|
class UniqueForMonthSerializer(serializers.ModelSerializer):
|
|
class Meta:
|
|
model = UniqueForMonthModel
|
|
fields = '__all__'
|
|
|
|
|
|
class UniqueForMonthTests(TestCase):
|
|
|
|
def setUp(self):
|
|
self.instance = UniqueForMonthModel.objects.create(
|
|
slug='existing', published='2017-01-01'
|
|
)
|
|
|
|
def test_not_unique_for_month(self):
|
|
data = {'slug': 'existing', 'published': '2017-01-01'}
|
|
serializer = UniqueForMonthSerializer(data=data)
|
|
assert not serializer.is_valid()
|
|
assert serializer.errors == {
|
|
'slug': ['This field must be unique for the "published" month.']
|
|
}
|
|
|
|
def test_unique_for_month(self):
|
|
data = {'slug': 'existing', 'published': '2017-02-01'}
|
|
serializer = UniqueForMonthSerializer(data=data)
|
|
assert serializer.is_valid()
|
|
assert serializer.validated_data == {
|
|
'slug': 'existing',
|
|
'published': datetime.date(2017, 2, 1)
|
|
}
|
|
|
|
# Tests for `UniqueForYearValidator`
|
|
# ----------------------------------
|
|
|
|
|
|
class UniqueForYearModel(models.Model):
|
|
slug = models.CharField(max_length=100, unique_for_year='published')
|
|
published = models.DateField()
|
|
|
|
|
|
class UniqueForYearSerializer(serializers.ModelSerializer):
|
|
class Meta:
|
|
model = UniqueForYearModel
|
|
fields = '__all__'
|
|
|
|
|
|
class UniqueForYearTests(TestCase):
|
|
|
|
def setUp(self):
|
|
self.instance = UniqueForYearModel.objects.create(
|
|
slug='existing', published='2017-01-01'
|
|
)
|
|
|
|
def test_not_unique_for_year(self):
|
|
data = {'slug': 'existing', 'published': '2017-01-01'}
|
|
serializer = UniqueForYearSerializer(data=data)
|
|
assert not serializer.is_valid()
|
|
assert serializer.errors == {
|
|
'slug': ['This field must be unique for the "published" year.']
|
|
}
|
|
|
|
def test_unique_for_year(self):
|
|
data = {'slug': 'existing', 'published': '2018-01-01'}
|
|
serializer = UniqueForYearSerializer(data=data)
|
|
assert serializer.is_valid()
|
|
assert serializer.validated_data == {
|
|
'slug': 'existing',
|
|
'published': datetime.date(2018, 1, 1)
|
|
}
|
|
|
|
|
|
class HiddenFieldUniqueForDateModel(models.Model):
|
|
slug = models.CharField(max_length=100, unique_for_date='published')
|
|
published = models.DateTimeField(auto_now_add=True)
|
|
|
|
|
|
class TestHiddenFieldUniquenessForDateValidation(TestCase):
|
|
def test_repr_date_field_not_included(self):
|
|
class TestSerializer(serializers.ModelSerializer):
|
|
class Meta:
|
|
model = HiddenFieldUniqueForDateModel
|
|
fields = ('id', 'slug')
|
|
|
|
serializer = TestSerializer()
|
|
expected = dedent("""
|
|
TestSerializer():
|
|
id = IntegerField(label='ID', read_only=True)
|
|
slug = CharField(max_length=100)
|
|
published = HiddenField(default=CreateOnlyDefault(<function now>))
|
|
class Meta:
|
|
validators = [<UniqueForDateValidator(queryset=HiddenFieldUniqueForDateModel.objects.all(), field='slug', date_field='published')>]
|
|
""")
|
|
assert repr(serializer) == expected
|
|
|
|
def test_repr_date_field_included(self):
|
|
class TestSerializer(serializers.ModelSerializer):
|
|
class Meta:
|
|
model = HiddenFieldUniqueForDateModel
|
|
fields = ('id', 'slug', 'published')
|
|
|
|
serializer = TestSerializer()
|
|
expected = dedent("""
|
|
TestSerializer():
|
|
id = IntegerField(label='ID', read_only=True)
|
|
slug = CharField(max_length=100)
|
|
published = DateTimeField(default=CreateOnlyDefault(<function now>), read_only=True)
|
|
class Meta:
|
|
validators = [<UniqueForDateValidator(queryset=HiddenFieldUniqueForDateModel.objects.all(), field='slug', date_field='published')>]
|
|
""")
|
|
assert repr(serializer) == expected
|
|
|
|
|
|
class ValidatorsTests(TestCase):
|
|
|
|
def test_qs_exists_handles_type_error(self):
|
|
class TypeErrorQueryset:
|
|
def exists(self):
|
|
raise TypeError
|
|
assert qs_exists(TypeErrorQueryset()) is False
|
|
|
|
def test_qs_exists_handles_value_error(self):
|
|
class ValueErrorQueryset:
|
|
def exists(self):
|
|
raise ValueError
|
|
assert qs_exists(ValueErrorQueryset()) is False
|
|
|
|
def test_qs_exists_handles_data_error(self):
|
|
class DataErrorQueryset:
|
|
def exists(self):
|
|
raise DataError
|
|
assert qs_exists(DataErrorQueryset()) is False
|
|
|
|
def test_validator_raises_error_if_not_all_fields_are_provided(self):
|
|
validator = BaseUniqueForValidator(queryset=object(), field='foo',
|
|
date_field='bar')
|
|
attrs = {'foo': 'baz'}
|
|
with pytest.raises(ValidationError):
|
|
validator.enforce_required_fields(attrs)
|
|
|
|
def test_validator_raises_error_when_abstract_method_called(self):
|
|
validator = BaseUniqueForValidator(queryset=object(), field='foo',
|
|
date_field='bar')
|
|
with pytest.raises(NotImplementedError):
|
|
validator.filter_queryset(
|
|
attrs=None, queryset=None, field_name='', date_field_name=''
|
|
)
|