django-rest-framework/tests/test_model_serializer.py
2014-10-01 19:44:46 +01:00

538 lines
21 KiB
Python

"""
The `ModelSerializer` and `HyperlinkedModelSerializer` classes are essentially
shortcuts for automatically creating serializers based on a given model class.
These tests deal with ensuring that we correctly map the model fields onto
an appropriate set of serializer fields for each case.
"""
from django.core.exceptions import ImproperlyConfigured
from django.core.validators import MaxValueValidator, MinValueValidator, MinLengthValidator
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 regular field mappings.
# ---------------------------------
class CustomField(models.Field):
"""
A custom model field simply for testing purposes.
"""
pass
class RegularFieldsModel(models.Model):
"""
A model class for testing regular flat fields.
"""
auto_field = models.AutoField(primary_key=True)
big_integer_field = models.BigIntegerField()
boolean_field = models.BooleanField(default=False)
char_field = models.CharField(max_length=100)
comma_seperated_integer_field = models.CommaSeparatedIntegerField(max_length=100)
date_field = models.DateField()
datetime_field = models.DateTimeField()
decimal_field = models.DecimalField(max_digits=3, decimal_places=1)
email_field = models.EmailField(max_length=100)
float_field = models.FloatField()
integer_field = models.IntegerField()
null_boolean_field = models.NullBooleanField()
positive_integer_field = models.PositiveIntegerField()
positive_small_integer_field = models.PositiveSmallIntegerField()
slug_field = models.SlugField(max_length=100)
small_integer_field = models.SmallIntegerField()
text_field = models.TextField()
time_field = models.TimeField()
url_field = models.URLField(max_length=100)
custom_field = CustomField()
def method(self):
return 'method'
COLOR_CHOICES = (('red', 'Red'), ('blue', 'Blue'), ('green', 'Green'))
class FieldOptionsModel(models.Model):
value_limit_field = models.IntegerField(validators=[MinValueValidator(1), MaxValueValidator(10)])
length_limit_field = models.CharField(validators=[MinLengthValidator(3)], max_length=12)
blank_field = models.CharField(blank=True, max_length=10)
null_field = models.IntegerField(null=True)
default_field = models.IntegerField(default=0)
descriptive_field = models.IntegerField(help_text='Some help text', verbose_name='A label')
choices_field = models.CharField(max_length=100, choices=COLOR_CHOICES)
class TestRegularFieldMappings(TestCase):
def test_regular_fields(self):
"""
Model fields should map to their equivelent serializer fields.
"""
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RegularFieldsModel
expected = dedent("""
TestSerializer():
auto_field = IntegerField(read_only=True)
big_integer_field = IntegerField()
boolean_field = BooleanField(required=False)
char_field = CharField(max_length=100)
comma_seperated_integer_field = CharField(max_length=100, validators=[<django.core.validators.RegexValidator object>])
date_field = DateField()
datetime_field = DateTimeField()
decimal_field = DecimalField(decimal_places=1, max_digits=3)
email_field = EmailField(max_length=100)
float_field = FloatField()
integer_field = IntegerField()
null_boolean_field = NullBooleanField()
positive_integer_field = IntegerField()
positive_small_integer_field = IntegerField()
slug_field = SlugField(max_length=100)
small_integer_field = IntegerField()
text_field = CharField(style={'type': 'textarea'})
time_field = TimeField()
url_field = URLField(max_length=100)
custom_field = ModelField(model_field=<tests.test_model_serializer.CustomField: custom_field>)
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_field_options(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = FieldOptionsModel
expected = dedent("""
TestSerializer():
id = IntegerField(label='ID', read_only=True)
value_limit_field = IntegerField(max_value=10, min_value=1)
length_limit_field = CharField(max_length=12, min_length=3)
blank_field = CharField(allow_blank=True, max_length=10)
null_field = IntegerField(allow_null=True)
default_field = IntegerField(required=False)
descriptive_field = IntegerField(help_text='Some help text', label='A label')
choices_field = ChoiceField(choices=[('red', 'Red'), ('blue', 'Blue'), ('green', 'Green')])
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_method_field(self):
"""
Properties and methods on the model should be allowed as `Meta.fields`
values, and should map to `ReadOnlyField`.
"""
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RegularFieldsModel
fields = ('auto_field', 'method')
expected = dedent("""
TestSerializer():
auto_field = IntegerField(read_only=True)
method = ReadOnlyField()
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_pk_fields(self):
"""
Both `pk` and the actual primary key name are valid in `Meta.fields`.
"""
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RegularFieldsModel
fields = ('pk', 'auto_field')
expected = dedent("""
TestSerializer():
pk = IntegerField(label='Auto field', read_only=True)
auto_field = IntegerField(read_only=True)
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_extra_field_kwargs(self):
"""
Ensure `extra_kwargs` are passed to generated fields.
"""
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RegularFieldsModel
fields = ('auto_field', 'char_field')
extra_kwargs = {'char_field': {'default': 'extra'}}
expected = dedent("""
TestSerializer():
auto_field = IntegerField(read_only=True)
char_field = CharField(default='extra', max_length=100)
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_invalid_field(self):
"""
Field names that do not map to a model field or relationship should
raise a configuration errror.
"""
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RegularFieldsModel
fields = ('auto_field', 'invalid')
with self.assertRaises(ImproperlyConfigured) as excinfo:
TestSerializer()
expected = 'Field name `invalid` is not valid for model `ModelBase`.'
assert str(excinfo.exception) == expected
def test_missing_field(self):
"""
Fields that have been declared on the serializer class must be included
in the `Meta.fields` if it exists.
"""
class TestSerializer(serializers.ModelSerializer):
missing = serializers.ReadOnlyField()
class Meta:
model = RegularFieldsModel
fields = ('auto_field',)
with self.assertRaises(ImproperlyConfigured) as excinfo:
TestSerializer()
expected = (
'Field `missing` has been declared on serializer '
'`TestSerializer`, but is missing from `Meta.fields`.'
)
assert str(excinfo.exception) == expected
# Tests for relational field mappings.
# ------------------------------------
class ForeignKeyTargetModel(models.Model):
name = models.CharField(max_length=100)
class ManyToManyTargetModel(models.Model):
name = models.CharField(max_length=100)
class OneToOneTargetModel(models.Model):
name = models.CharField(max_length=100)
class ThroughTargetModel(models.Model):
name = models.CharField(max_length=100)
class Supplementary(models.Model):
extra = models.IntegerField()
forwards = models.ForeignKey('ThroughTargetModel')
backwards = models.ForeignKey('RelationalModel')
class RelationalModel(models.Model):
foreign_key = models.ForeignKey(ForeignKeyTargetModel, related_name='reverse_foreign_key')
many_to_many = models.ManyToManyField(ManyToManyTargetModel, related_name='reverse_many_to_many')
one_to_one = models.OneToOneField(OneToOneTargetModel, related_name='reverse_one_to_one')
through = models.ManyToManyField(ThroughTargetModel, through=Supplementary, related_name='reverse_through')
class TestRelationalFieldMappings(TestCase):
def test_pk_relations(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RelationalModel
expected = dedent("""
TestSerializer():
id = IntegerField(label='ID', read_only=True)
foreign_key = PrimaryKeyRelatedField(queryset=ForeignKeyTargetModel.objects.all())
one_to_one = PrimaryKeyRelatedField(queryset=OneToOneTargetModel.objects.all())
many_to_many = PrimaryKeyRelatedField(many=True, queryset=ManyToManyTargetModel.objects.all())
through = PrimaryKeyRelatedField(many=True, read_only=True)
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_nested_relations(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RelationalModel
depth = 1
expected = dedent("""
TestSerializer():
id = IntegerField(label='ID', read_only=True)
foreign_key = NestedSerializer(read_only=True):
id = IntegerField(label='ID', read_only=True)
name = CharField(max_length=100)
one_to_one = NestedSerializer(read_only=True):
id = IntegerField(label='ID', read_only=True)
name = CharField(max_length=100)
many_to_many = NestedSerializer(many=True, read_only=True):
id = IntegerField(label='ID', read_only=True)
name = CharField(max_length=100)
through = NestedSerializer(many=True, read_only=True):
id = IntegerField(label='ID', read_only=True)
name = CharField(max_length=100)
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_hyperlinked_relations(self):
class TestSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = RelationalModel
expected = dedent("""
TestSerializer():
url = HyperlinkedIdentityField(view_name='relationalmodel-detail')
foreign_key = HyperlinkedRelatedField(queryset=ForeignKeyTargetModel.objects.all(), view_name='foreignkeytargetmodel-detail')
one_to_one = HyperlinkedRelatedField(queryset=OneToOneTargetModel.objects.all(), view_name='onetoonetargetmodel-detail')
many_to_many = HyperlinkedRelatedField(many=True, queryset=ManyToManyTargetModel.objects.all(), view_name='manytomanytargetmodel-detail')
through = HyperlinkedRelatedField(many=True, read_only=True, view_name='throughtargetmodel-detail')
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_nested_hyperlinked_relations(self):
class TestSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = RelationalModel
depth = 1
expected = dedent("""
TestSerializer():
url = HyperlinkedIdentityField(view_name='relationalmodel-detail')
foreign_key = NestedSerializer(read_only=True):
url = HyperlinkedIdentityField(view_name='foreignkeytargetmodel-detail')
name = CharField(max_length=100)
one_to_one = NestedSerializer(read_only=True):
url = HyperlinkedIdentityField(view_name='onetoonetargetmodel-detail')
name = CharField(max_length=100)
many_to_many = NestedSerializer(many=True, read_only=True):
url = HyperlinkedIdentityField(view_name='manytomanytargetmodel-detail')
name = CharField(max_length=100)
through = NestedSerializer(many=True, read_only=True):
url = HyperlinkedIdentityField(view_name='throughtargetmodel-detail')
name = CharField(max_length=100)
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_pk_reverse_foreign_key(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = ForeignKeyTargetModel
fields = ('id', 'name', 'reverse_foreign_key')
expected = dedent("""
TestSerializer():
id = IntegerField(label='ID', read_only=True)
name = CharField(max_length=100)
reverse_foreign_key = PrimaryKeyRelatedField(many=True, queryset=RelationalModel.objects.all())
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_pk_reverse_one_to_one(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = OneToOneTargetModel
fields = ('id', 'name', 'reverse_one_to_one')
expected = dedent("""
TestSerializer():
id = IntegerField(label='ID', read_only=True)
name = CharField(max_length=100)
reverse_one_to_one = PrimaryKeyRelatedField(queryset=RelationalModel.objects.all())
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_pk_reverse_many_to_many(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = ManyToManyTargetModel
fields = ('id', 'name', 'reverse_many_to_many')
expected = dedent("""
TestSerializer():
id = IntegerField(label='ID', read_only=True)
name = CharField(max_length=100)
reverse_many_to_many = PrimaryKeyRelatedField(many=True, queryset=RelationalModel.objects.all())
""")
self.assertEqual(repr(TestSerializer()), expected)
def test_pk_reverse_through(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = ThroughTargetModel
fields = ('id', 'name', 'reverse_through')
expected = dedent("""
TestSerializer():
id = IntegerField(label='ID', read_only=True)
name = CharField(max_length=100)
reverse_through = PrimaryKeyRelatedField(many=True, read_only=True)
""")
self.assertEqual(repr(TestSerializer()), expected)
class TestIntegration(TestCase):
def setUp(self):
self.foreign_key_target = ForeignKeyTargetModel.objects.create(
name='foreign_key'
)
self.one_to_one_target = OneToOneTargetModel.objects.create(
name='one_to_one'
)
self.many_to_many_targets = [
ManyToManyTargetModel.objects.create(
name='many_to_many (%d)' % idx
) for idx in range(3)
]
self.instance = RelationalModel.objects.create(
foreign_key=self.foreign_key_target,
one_to_one=self.one_to_one_target,
)
self.instance.many_to_many = self.many_to_many_targets
self.instance.save()
def test_pk_retrival(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RelationalModel
serializer = TestSerializer(self.instance)
expected = {
'id': self.instance.pk,
'foreign_key': self.foreign_key_target.pk,
'one_to_one': self.one_to_one_target.pk,
'many_to_many': [item.pk for item in self.many_to_many_targets],
'through': []
}
self.assertEqual(serializer.data, expected)
def test_pk_create(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RelationalModel
new_foreign_key = ForeignKeyTargetModel.objects.create(
name='foreign_key'
)
new_one_to_one = OneToOneTargetModel.objects.create(
name='one_to_one'
)
new_many_to_many = [
ManyToManyTargetModel.objects.create(
name='new many_to_many (%d)' % idx
) for idx in range(3)
]
data = {
'foreign_key': new_foreign_key.pk,
'one_to_one': new_one_to_one.pk,
'many_to_many': [item.pk for item in new_many_to_many],
}
# Serializer should validate okay.
serializer = TestSerializer(data=data)
assert serializer.is_valid()
# Creating the instance, relationship attributes should be set.
instance = serializer.save()
assert instance.foreign_key.pk == new_foreign_key.pk
assert instance.one_to_one.pk == new_one_to_one.pk
assert [
item.pk for item in instance.many_to_many.all()
] == [
item.pk for item in new_many_to_many
]
assert list(instance.through.all()) == []
# Representation should be correct.
expected = {
'id': instance.pk,
'foreign_key': new_foreign_key.pk,
'one_to_one': new_one_to_one.pk,
'many_to_many': [item.pk for item in new_many_to_many],
'through': []
}
self.assertEqual(serializer.data, expected)
def test_pk_update(self):
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = RelationalModel
new_foreign_key = ForeignKeyTargetModel.objects.create(
name='foreign_key'
)
new_one_to_one = OneToOneTargetModel.objects.create(
name='one_to_one'
)
new_many_to_many = [
ManyToManyTargetModel.objects.create(
name='new many_to_many (%d)' % idx
) for idx in range(3)
]
data = {
'foreign_key': new_foreign_key.pk,
'one_to_one': new_one_to_one.pk,
'many_to_many': [item.pk for item in new_many_to_many],
}
# Serializer should validate okay.
serializer = TestSerializer(self.instance, data=data)
assert serializer.is_valid()
# Creating the instance, relationship attributes should be set.
instance = serializer.save()
assert instance.foreign_key.pk == new_foreign_key.pk
assert instance.one_to_one.pk == new_one_to_one.pk
assert [
item.pk for item in instance.many_to_many.all()
] == [
item.pk for item in new_many_to_many
]
assert list(instance.through.all()) == []
# Representation should be correct.
expected = {
'id': self.instance.pk,
'foreign_key': new_foreign_key.pk,
'one_to_one': new_one_to_one.pk,
'many_to_many': [item.pk for item in new_many_to_many],
'through': []
}
self.assertEqual(serializer.data, expected)
# Tests for bulk create using `ListSerializer`.
class BulkCreateModel(models.Model):
name = models.CharField(max_length=10)
class TestBulkCreate(TestCase):
def test_bulk_create(self):
class BasicModelSerializer(serializers.ModelSerializer):
class Meta:
model = BulkCreateModel
fields = ('name',)
class BulkCreateSerializer(serializers.ListSerializer):
child = BasicModelSerializer()
data = [{'name': 'a'}, {'name': 'b'}, {'name': 'c'}]
serializer = BulkCreateSerializer(data=data)
assert serializer.is_valid()
# Objects are returned by save().
instances = serializer.save()
assert len(instances) == 3
assert [item.name for item in instances] == ['a', 'b', 'c']
# Objects have been created in the database.
assert BulkCreateModel.objects.count() == 3
assert list(BulkCreateModel.objects.values_list('name', flat=True)) == ['a', 'b', 'c']
# Serializer returns correct data.
assert serializer.data == data