add blank_nullable option for ModelSchema

Author: tomatod

ninja/orm/factory.py

@@ -41,6 +41,7 @@ def create_schema(
         fields: Optional[List[str]] = None,
         exclude: Optional[List[str]] = None,
         optional_fields: Optional[List[str]] = None,
+        blank_nullable: bool = True,
         custom_fields: Optional[List[Tuple[str, Any, Any]]] = None,
         base_class: Type[Schema] = Schema,
     ) -> Type[Schema]:
@@ -66,6 +67,7 @@ def create_schema(
                 fld,
                 depth=depth,
                 optional=optional_fields and (fld.name in optional_fields),
+                blank_nullable=blank_nullable,
             )
             definitions[fld.name] = (python_type, field_info)
 

ninja/orm/fields.py

@@ -115,7 +115,11 @@ def _validate(cls, v: Any, _):
 
 @no_type_check
 def get_schema_field(
-    field: DjangoField, *, depth: int = 0, optional: bool = False
+    field: DjangoField,
+    *,
+    depth: int = 0,
+    optional: bool = False,
+    blank_nullable: bool = True,
 ) -> Tuple:
     "Returns pydantic field from django's model field"
     alias = None
@@ -163,7 +167,7 @@ def get_schema_field(
             ]
             raise ConfigError("\n".join(msg)) from e
 
-        if field.primary_key or blank or null or optional:
+        if field.primary_key or (blank_nullable and blank) or null or optional:
             default = None
             nullable = True
 

ninja/orm/metaclass.py

@@ -17,6 +17,7 @@ class MetaConf:
     fields: Optional[List[str]] = None
     exclude: Union[List[str], str, None] = None
     fields_optional: Union[List[str], str, None] = None
+    blank_nullable: bool = True
 
     @staticmethod
     def from_schema_class(name: str, namespace: dict) -> "MetaConf":
@@ -26,13 +27,15 @@ def from_schema_class(name: str, namespace: dict) -> "MetaConf":
             fields = getattr(meta, "fields", None)
             exclude = getattr(meta, "exclude", None)
             optional_fields = getattr(meta, "fields_optional", None)
+            blank_nullable = getattr(meta, "blank_nullable", True)
 
         elif "Config" in namespace:
             config = namespace["Config"]
             model = config.model
             fields = getattr(config, "model_fields", None)
             exclude = getattr(config, "model_exclude", None)
             optional_fields = getattr(config, "model_fields_optional", None)
+            blank_nullable = getattr(config, "blank_nullable", True)
 
             warnings.warn(
                 "The use of `Config` class is deprecated for ModelSchema, use 'Meta' instead",
@@ -62,6 +65,7 @@ def from_schema_class(name: str, namespace: dict) -> "MetaConf":
             fields=fields,
             exclude=exclude,
             fields_optional=optional_fields,
+            blank_nullable=blank_nullable,
         )
 
 
@@ -109,6 +113,7 @@ def __new__(
                     fields=meta_conf.fields,
                     exclude=meta_conf.exclude,
                     optional_fields=meta_conf.fields_optional,
+                    blank_nullable=meta_conf.blank_nullable,
                     custom_fields=custom_fields,
                     base_class=cls,
                 )

tests/test_orm_metaclass.py

@@ -192,6 +192,13 @@ class Meta:
             fields = "__all__"
             fields_optional = ["field5"]
 
+    class BlankTestSchema2(ModelSchema):
+        class Meta:
+            model = BlankTestModel
+            fields = "__all__"
+            fields_optional = ["field5"]
+            blank_nullable = False
+
     assert BlankTestSchema1.json_schema() == {
         "title": "BlankTestSchema1",
         "type": "object",
@@ -218,6 +225,29 @@ class Meta:
         "required": ["field2"],
     }
 
+    assert BlankTestSchema2.json_schema() == {
+        "title": "BlankTestSchema2",
+        "type": "object",
+        "properties": {
+            "id": {"title": "ID", "anyOf": [{"type": "integer"}, {"type": "null"}]},
+            "field1": {"title": "Field1", "type": "string"},
+            "field2": {"title": "Field2", "type": "integer"},
+            "field3": {
+                "title": "Field3",
+                "anyOf": [{"type": "string", "format": "date"}, {"type": "null"}],
+            },
+            "field4": {
+                "title": "Field4",
+                "anyOf": [{"type": "string"}, {"type": "null"}],
+            },
+            "field5": {
+                "title": "Field5",
+                "anyOf": [{"type": "string"}, {"type": "null"}],
+            },
+        },
+        "required": ["field1", "field2"],
+    }
+
 
 def test_model_schema_without_config():
     with pytest.raises(