Circumvent double validation by pydantic + FastAPI when generating AP…

…I response

- Fix type hint: FastAPI suggests using

optimade/server/routers/references.py

@@ -1,3 +1,5 @@
+from typing import Any
+
 from fastapi import APIRouter, Depends, Request
 
 from optimade.models import (
@@ -30,7 +32,7 @@
 )
 def get_references(
     request: Request, params: EntryListingQueryParams = Depends()
-) -> ReferenceResponseMany:
+) -> Any:
     return get_entries(
         collection=references_coll,
         response=ReferenceResponseMany,
@@ -48,7 +50,7 @@ def get_references(
 )
 def get_single_reference(
     request: Request, entry_id: str, params: SingleEntryQueryParams = Depends()
-) -> ReferenceResponseOne:
+) -> Any:
     return get_single_entry(
         collection=references_coll,
         entry_id=entry_id,

optimade/server/routers/structures.py

@@ -1,3 +1,5 @@
+from typing import Any
+
 from fastapi import APIRouter, Depends, Request
 
 from optimade.models import (
@@ -30,7 +32,7 @@
 )
 def get_structures(
     request: Request, params: EntryListingQueryParams = Depends()
-) -> StructureResponseMany:
+) -> Any:
     return get_entries(
         collection=structures_coll,
         response=StructureResponseMany,
@@ -48,7 +50,7 @@ def get_structures(
 )
 def get_single_structure(
     request: Request, entry_id: str, params: SingleEntryQueryParams = Depends()
-) -> StructureResponseOne:
+) -> Any:
     return get_single_entry(
         collection=structures_coll,
         entry_id=entry_id,

optimade/server/routers/utils.py

@@ -249,7 +249,7 @@ def get_entries(
     response: Type[EntryResponseMany],
     request: Request,
     params: EntryListingQueryParams,
-) -> EntryResponseMany:
+) -> Dict:
     """Generalized /{entry} endpoint getter"""
     from optimade.server.routers import ENTRY_COLLECTIONS
 
@@ -285,7 +285,7 @@ def get_entries(
     if results is not None and (fields or include_fields):
         results = handle_response_fields(results, fields, include_fields)  # type: ignore[assignment]
 
-    return response(
+    return dict(
         links=links,
         data=results if results else [],
         meta=meta_values(
@@ -307,7 +307,7 @@ def get_single_entry(
     response: Type[EntryResponseOne],
     request: Request,
     params: SingleEntryQueryParams,
-) -> EntryResponseOne:
+) -> Dict:
     from optimade.server.routers import ENTRY_COLLECTIONS
 
     params.check_params(request.query_params)
@@ -338,7 +338,7 @@ def get_single_entry(
     if results is not None and (fields or include_fields):
         results = handle_response_fields(results, fields, include_fields)[0]  # type: ignore[assignment]
 
-    return response(
+    return dict(
         links=links,
         data=results if results else None,
         meta=meta_values(