Changed InputObjectType's default builder-from-dict argument to be Undefined instead of None (or else we can't catch "null" inputs in InputObjectTypes, as both would coerce to None)

graphene/types/inputobjecttype.py

@@ -14,6 +14,14 @@ class InputObjectTypeOptions(BaseOptions):
     container = None  # type: InputObjectTypeContainer
 
 
+_INPUT_OBJECT_TYPE_DEFAULT_VALUE = None
+
+
+def set_input_object_type_default_value(default_value):
+    global _INPUT_OBJECT_TYPE_DEFAULT_VALUE
+    _INPUT_OBJECT_TYPE_DEFAULT_VALUE = default_value
+
+
 class InputObjectTypeContainer(dict, BaseType):  # type: ignore
     class Meta:
         abstract = True
@@ -21,7 +29,7 @@ class InputObjectTypeContainer(dict, BaseType):  # type: ignore
     def __init__(self, *args, **kwargs):
         dict.__init__(self, *args, **kwargs)
         for key in self._meta.fields:
-            setattr(self, key, self.get(key, None))
+            setattr(self, key, self.get(key, _INPUT_OBJECT_TYPE_DEFAULT_VALUE))
 
     def __init_subclass__(cls, *args, **kwargs):
         pass

graphene/types/tests/test_type_map.py

@@ -16,7 +16,7 @@ from ..dynamic import Dynamic
 from ..enum import Enum
 from ..field import Field
 from ..inputfield import InputField
-from ..inputobjecttype import InputObjectType
+from ..inputobjecttype import InputObjectType, set_input_object_type_default_value
 from ..interface import Interface
 from ..objecttype import ObjectType
 from ..scalars import Int, String
@@ -227,6 +227,20 @@ def test_inputobject():
     assert foo_field.description == "Field description"
 
 
+def test_inputobject_undefined():
+    set_input_object_type_default_value(Undefined)
+
+    class OtherObjectType(InputObjectType):
+        optional_field = String()
+
+    type_map = create_type_map([OtherObjectType])
+    assert "OtherObjectType" in type_map
+    graphql_type = type_map["OtherObjectType"]
+
+    container = graphql_type.out_type({})
+    assert container.optional_field is Undefined
+
+
 def test_objecttype_camelcase():
     class MyObjectType(ObjectType):
         """Description"""

graphene/validation/depth_limit.py

@@ -30,7 +30,7 @@ try:
 except ImportError:
     # backwards compatibility for v3.6
     from typing import Pattern
-from typing import Callable, Dict, List, Optional, Union
+from typing import Callable, Dict, List, Optional, Union, Tuple
 
 from graphql import GraphQLError
 from graphql.validation import ValidationContext, ValidationRule
@@ -82,7 +82,7 @@ def depth_limit_validator(
 
 
 def get_fragments(
-    definitions: List[DefinitionNode],
+    definitions: Tuple[DefinitionNode, ...],
 ) -> Dict[str, FragmentDefinitionNode]:
     fragments = {}
     for definition in definitions:
@@ -94,7 +94,7 @@ def get_fragments(
 # This will actually get both queries and mutations.
 # We can basically treat those the same
 def get_queries_and_mutations(
-    definitions: List[DefinitionNode],
+    definitions: Tuple[DefinitionNode, ...],
 ) -> Dict[str, OperationDefinitionNode]:
     operations = {}