Schema nullable value

openapi_core/schemas.py

@@ -26,7 +26,7 @@ class Schema(object):
 
     def __init__(
             self, schema_type, model=None, properties=None, items=None,
-            spec_format=None, required=False, default=None):
+            spec_format=None, required=False, default=None, nullable=False):
         self.type = schema_type
         self.model = model
         self.properties = properties and dict(properties) or {}
@@ -34,6 +34,7 @@ class Schema(object):
         self.format = spec_format
         self.required = required
         self.default = default
+        self.nullable = nullable
 
     def __getitem__(self, name):
         return self.properties[name]
@@ -50,7 +51,11 @@ class Schema(object):
     def cast(self, value):
         """Cast value to schema type"""
         if value is None:
-            return None
+            if not self.nullable:
+                raise InvalidValueType(
+                    "Failed to cast value of %s to %s", value, self.type,
+                )
+            return self.default
 
         cast_mapping = self.get_cast_mapping()
 
@@ -98,6 +103,8 @@ class Schema(object):
                 if prop_name in self.required:
                     raise MissingPropertyError(
                         "Missing schema property {0}".format(prop_name))
+                if not prop.nullable and not prop.default:
+                    continue
                 prop_value = prop.default
             properties[prop_name] = prop.unmarshal(prop_value)
         return ModelFactory().create(properties, name=self.model)
@@ -130,6 +137,7 @@ class SchemaFactory(object):
         required = schema_deref.get('required', False)
         properties_spec = schema_deref.get('properties', None)
         items_spec = schema_deref.get('items', None)
+        nullable = schema_deref.get('nullable', False)
 
         properties = None
         if properties_spec:
@@ -141,7 +149,7 @@ class SchemaFactory(object):
 
         return Schema(
             schema_type, model=model, properties=properties, items=items,
-            required=required,
+            required=required, nullable=nullable,
         )
 
     @property

tests/integration/data/v3.0/petstore.yaml

@@ -27,6 +27,7 @@ paths:
           schema:
             type: integer
             format: int32
+            nullable: true
         - name: ids
           in: query
           description: Filter pets with Ids

tests/integration/test_petstore.py

@@ -323,8 +323,8 @@ class TestPetstore(object):
         pet_model = schemas['PetCreate']['x-model']
         assert body.__class__.__name__ == pet_model
         assert body.name == pet_name
-        assert body.tag is None
+        assert not hasattr(body, 'tag')
-        assert body.address is None
+        assert not hasattr(body, 'address')
 
     def test_get_pets_wrong_body_type(self, spec):
         host_url = 'http://petstore.swagger.io/v1'

tests/unit/test_schemas.py

@@ -1,10 +1,11 @@
 import mock
 import pytest
 
+from openapi_core.exceptions import InvalidValueType
 from openapi_core.schemas import Schema
 
 
-class TestSchemas(object):
+class TestSchemaIteritems(object):
 
     @pytest.fixture
     def schema(self):
@@ -15,6 +16,73 @@ class TestSchemas(object):
         return Schema('object', properties=properties)
 
     @property
-    def test_iteritems(self, schema):
+    def test_valid(self, schema):
         for name in schema.properties.keys():
             assert schema[name] == schema.properties[name]
+
+
+class TestSchemaUnmarshal(object):
+
+    def test_string_valid(self):
+        schema = Schema('string')
+        value = 'test'
+
+        result = schema.unmarshal(value)
+
+        assert result == value
+
+    def test_string_none(self):
+        schema = Schema('string')
+        value = None
+
+        with pytest.raises(InvalidValueType):
+            schema.unmarshal(value)
+
+    def test_string_default(self):
+        default_value = 'default'
+        schema = Schema('string', default=default_value)
+        value = None
+
+        with pytest.raises(InvalidValueType):
+            schema.unmarshal(value)
+
+    def test_string_default_nullable(self):
+        default_value = 'default'
+        schema = Schema('string', default=default_value, nullable=True)
+        value = None
+
+        result = schema.unmarshal(value)
+
+        assert result == default_value
+
+    def test_integer_valid(self):
+        schema = Schema('integer')
+        value = '123'
+
+        result = schema.unmarshal(value)
+
+        assert result == int(value)
+
+    def test_integer_default(self):
+        default_value = '123'
+        schema = Schema('integer', default=default_value)
+        value = None
+
+        with pytest.raises(InvalidValueType):
+            schema.unmarshal(value)
+
+    def test_integer_default_nullable(self):
+        default_value = '123'
+        schema = Schema('integer', default=default_value, nullable=True)
+        value = None
+
+        result = schema.unmarshal(value)
+
+        assert result == default_value
+
+    def test_integer_invalid(self):
+        schema = Schema('integer')
+        value = 'abc'
+
+        with pytest.raises(InvalidValueType):
+            schema.unmarshal(value)