Use serialization aliases for responses in OpenAPI schema

ninja/openapi/schema.py

@@ -4,6 +4,8 @@
 from http.client import responses
 from typing import TYPE_CHECKING, Any, Dict, Generator, List, Optional, Set, Tuple
 
+from pydantic.json_schema import JsonSchemaMode
+
 from ninja.constants import NOT_SET
 from ninja.operation import Operation
 from ninja.params.models import TModel, TModels
@@ -207,6 +209,7 @@ def _create_schema_from_model(
         model: TModel,
         by_alias: bool = True,
         remove_level: bool = True,
+        mode: JsonSchemaMode = "validation",
     ) -> Tuple[DictStrAny, bool]:
         if hasattr(model, "__ninja_flatten_map__"):
             schema = self._flatten_schema(model)
@@ -215,6 +218,7 @@ def _create_schema_from_model(
                 ref_template=REF_TEMPLATE,
                 by_alias=by_alias,
                 schema_generator=NinjaGenerateJsonSchema,
+                mode=mode,
             ).copy()
 
         # move Schemas from definitions
@@ -284,7 +288,7 @@ def responses(self, operation: Operation) -> Dict[int, DictStrAny]:
             if model not in [None, NOT_SET]:
                 # ::TODO:: test this: by_alias == True
                 schema = self._create_schema_from_model(
-                    model, by_alias=operation.by_alias
+                    model, by_alias=operation.by_alias, mode="serialization"
                 )[0]
                 details[status]["content"] = {
                     self.api.renderer.media_type: {"schema": schema}

tests/test_openapi_schema.py

@@ -942,3 +942,29 @@ def get_employees(request):
     paged_employee_out = schema["components"]["schemas"]["PagedEmployeeOut"]
     # a default value shouldn't be specified automatically
     assert "default" not in paged_employee_out["properties"]["data"]
+
+
+def test_renders_responses_with_serialization_alias():
+    api = NinjaAPI(renderer=TestRenderer)
+
+    class ResponseWithSerializationAlias(Schema):
+        my_field: str = Field(..., serialization_alias="myFieldName")
+
+    @api.get(
+        "/test-with-serialization-alias/",
+        response=ResponseWithSerializationAlias,
+        by_alias=True,
+    )
+    def method_test_with_serialization_alias(
+        request,
+    ):
+        return ResponseWithSerializationAlias(my_field="Field Value")
+
+    schema = api.get_openapi_schema()
+
+    assert (
+        "myFieldName"
+        in schema["components"]["schemas"]["ResponseWithSerializationAlias"][
+            "properties"
+        ]
+    )