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|
from django.db import models
from django.test import TestCase
from rest_framework import serializers
def dedent(blocktext):
return '\n'.join([line[12:] for line in blocktext.splitlines()[1:-1]])
# Tests for `UniqueValidator`
# ---------------------------
class UniquenessModel(models.Model):
username = models.CharField(unique=True, max_length=100)
class UniquenessSerializer(serializers.ModelSerializer):
class Meta:
model = UniquenessModel
class TestUniquenessValidation(TestCase):
def setUp(self):
self.instance = UniquenessModel.objects.create(username='existing')
def test_repr(self):
serializer = UniquenessSerializer()
expected = dedent("""
UniquenessSerializer():
id = IntegerField(label='ID', read_only=True)
username = CharField(max_length=100, validators=[<UniqueValidator(queryset=UniquenessModel.objects.all())>])
""")
assert repr(serializer) == expected
def test_is_not_unique(self):
data = {'username': 'existing'}
serializer = UniquenessSerializer(data=data)
assert not serializer.is_valid()
assert serializer.errors == {'username': ['This field must be unique.']}
def test_is_unique(self):
data = {'username': 'other'}
serializer = UniquenessSerializer(data=data)
assert serializer.is_valid()
assert serializer.validated_data == {'username': 'other'}
def test_updated_instance_excluded(self):
data = {'username': 'existing'}
serializer = UniquenessSerializer(self.instance, data=data)
assert serializer.is_valid()
assert serializer.validated_data == {'username': 'existing'}
# Tests for `UniqueTogetherValidator`
# -----------------------------------
class UniquenessTogetherModel(models.Model):
race_name = models.CharField(max_length=100)
position = models.IntegerField()
class Meta:
unique_together = ('race_name', 'position')
class UniquenessTogetherSerializer(serializers.ModelSerializer):
class Meta:
model = UniquenessTogetherModel
class TestUniquenessTogetherValidation(TestCase):
def setUp(self):
self.instance = UniquenessTogetherModel.objects.create(
race_name='example',
position=1
)
UniquenessTogetherModel.objects.create(
race_name='example',
position=2
)
UniquenessTogetherModel.objects.create(
race_name='other',
position=1
)
def test_repr(self):
serializer = UniquenessTogetherSerializer()
expected = dedent("""
UniquenessTogetherSerializer(validators=[<UniqueTogetherValidator(queryset=UniquenessTogetherModel.objects.all(), fields=('race_name', 'position'))>]):
id = IntegerField(label='ID', read_only=True)
race_name = CharField(max_length=100)
position = IntegerField()
""")
assert repr(serializer) == expected
def test_is_not_unique_together(self):
"""
Failing unique together validation should result in non field errors.
"""
data = {'race_name': 'example', 'position': 2}
serializer = UniquenessTogetherSerializer(data=data)
assert not serializer.is_valid()
assert serializer.errors == {
'non_field_errors': [
'The fields race_name, position must make a unique set.'
]
}
def test_is_unique_together(self):
"""
In a unique together validation, one field may be non-unique
so long as the set as a whole is unique.
"""
data = {'race_name': 'other', 'position': 2}
serializer = UniquenessTogetherSerializer(data=data)
assert serializer.is_valid()
assert serializer.validated_data == {
'race_name': 'other',
'position': 2
}
def test_updated_instance_excluded_from_unique_together(self):
"""
When performing an update, the existing instance does not count
as a match against uniqueness.
"""
data = {'race_name': 'example', 'position': 1}
serializer = UniquenessTogetherSerializer(self.instance, data=data)
assert serializer.is_valid()
assert serializer.validated_data == {
'race_name': 'example',
'position': 1
}
def test_ignore_exlcuded_fields(self):
"""
When model fields are not included in a serializer, then uniqueness
validtors should not be added for that field.
"""
class ExcludedFieldSerializer(serializers.ModelSerializer):
class Meta:
model = UniquenessTogetherModel
fields = ('id', 'race_name',)
serializer = ExcludedFieldSerializer()
expected = dedent("""
ExcludedFieldSerializer():
id = IntegerField(label='ID', read_only=True)
race_name = CharField(max_length=100)
""")
assert repr(serializer) == expected
|
