remove fields or excludes requirement

ninja/orm/metaclass.py

@@ -43,9 +43,7 @@ class MetaConf(BaseModel):
 
     @model_validator(mode="after")
     def check_fields(self) -> Self:
-        if self.model and (
-            (not self.exclude and not self.fields) or (self.exclude and self.fields)
-        ):
+        if self.model and (self.exclude and self.fields):
             raise ValueError("Specify either `exclude` or `fields`")
 
         if self.fields_optional:

tests/test_orm_metaclass.py

@@ -98,12 +98,6 @@ class Meta:
         class CategorySchema1(ModelSchema):
             class Meta:
                 model = Category
-
-    with pytest.raises(ValidationError, match="Specify either `exclude` or `fields`"):
-
-        class CategorySchema2(ModelSchema):
-            class Meta:
-                model = Category
                 exclude = ["title"]
                 fields = ["title"]
 
@@ -112,14 +106,14 @@ class Meta:
         match="Use only `optional_fields`, `fields_optional` is deprecated.",
     ):
 
-        class CategorySchema3(ModelSchema):
+        class CategorySchema2(ModelSchema):
             class Meta:
                 model = Category
                 fields = "__all__"
                 fields_optional = ["title"]
                 optional_fields = ["title"]
 
-    class CategorySchema4(ModelSchema):
+    class CategorySchema3(ModelSchema):
         class Config:
             model = Category
             fields = "__all__"