drop invalid query parameters

fastapi/_compat.py

@@ -658,11 +658,8 @@ def field_annotation_is_scalar_sequence_mapping(
                 return False
         return at_least_one_scalar_mapping
     return field_annotation_is_mapping(annotation) and all(
-        (
-            field_annotation_is_scalar_sequence(sub_annotation)
-            or field_annotation_is_scalar(sub_annotation)
-        )
-        for sub_annotation in get_args(annotation)
+        field_annotation_is_scalar_sequence(sub_annotation)
+        for sub_annotation in get_args(annotation)[1:]
     )
 
 

fastapi/dependencies/utils.py

@@ -453,7 +453,7 @@ def is_body_param(*, param_field: ModelField, is_path_param: bool) -> bool:
         param_field.field_info, (params.Query, params.Header)
     ) and is_scalar_sequence_field(param_field):
         return False
-    elif isinstance(param_field.field_info, (params.Query, params.Header)) and (
+    elif isinstance(param_field.field_info, params.Query) and (
         is_scalar_sequence_mapping_field(param_field)
         or is_scalar_mapping_field(param_field)
     ):
@@ -640,6 +640,7 @@ async def solve_dependencies(
         )
     return values, errors, background_tasks, response, dependency_cache
 
+class Marker: pass
 
 def request_params_to_args(
     required_params: Sequence[ModelField],
@@ -653,18 +654,15 @@ def request_params_to_args(
         ):
             value = received_params.getlist(field.alias) or field.default
         elif is_scalar_mapping_field(field) and isinstance(
-            received_params, (QueryParams)
+            received_params, QueryParams
         ):
             value = dict(received_params.multi_items()) or field.default
         elif is_scalar_sequence_mapping_field(field) and isinstance(
-            received_params, (QueryParams)
+            received_params, QueryParams
         ):
-            if not len(received_params.multi_items()):
-                value = field.default
-            else:
-                value = defaultdict(list)
-                for k, v in received_params.multi_items():
-                    value[k].append(v)
+            value = defaultdict(list)
+            for k, v in received_params.multi_items():
+                value[k].append(v)
         else:
             value = received_params.get(field.alias)
         field_info = field.field_info
@@ -681,6 +679,29 @@ def request_params_to_args(
         v_, errors_ = field.validate(value, values, loc=loc)
         if isinstance(errors_, ErrorWrapper):
             errors.append(errors_)
+        elif (
+                isinstance(errors_, list)
+                and is_scalar_sequence_mapping_field(field)
+                and isinstance(received_params, QueryParams)
+            ):
+            new_errors = _regenerate_error_with_loc(errors=errors_, loc_prefix=())
+            # remove all invalid parameters
+            marker = Marker()
+            for _, _, key, index in [error["loc"] for error in new_errors]:
+                value[key][index] = marker
+            for key in value:
+                value[key] = [x for x in value[key] if x != marker]
+            values[field.name] = value
+        elif (
+                isinstance(errors_, list)
+                and is_scalar_mapping_field(field)
+                and isinstance(received_params, QueryParams)
+        ):
+            new_errors = _regenerate_error_with_loc(errors=errors_, loc_prefix=())
+            # remove all invalid parameters
+            for _, _, key in [error["loc"] for error in new_errors]:
+                value.pop(key)
+            values[field.name] = value
         elif isinstance(errors_, list):
             new_errors = _regenerate_error_with_loc(errors=errors_, loc_prefix=())
             errors.extend(new_errors)

tests/main.py

@@ -5,7 +5,6 @@ from fastapi import FastAPI, Path, Query
 
 app = FastAPI()
 
-
 @app.api_route("/api_route")
 def non_operation():
     return {"message": "Hello World"}
@@ -196,7 +195,29 @@ def get_mapping_query_params(queries: Mapping[str, str] = Query({})):
 
 @app.get("/query/mapping-sequence-params")
 def get_sequence_mapping_query_params(queries: Mapping[str, List[int]] = Query({})):
-    return f"foo bar {queries}"
+    return f"foo bar {dict(queries)}"
+
+
+@app.get("/query/mixed-params")
+def get_mixed_mapping_query_params(
+    sequence_mapping_queries: Mapping[str, List[str]] = Query({}),
+    mapping_query: Mapping[str, str] = Query(),
+    query: str = Query(),
+):
+    return (
+        f"foo bar {sequence_mapping_queries['foo'][0]} {sequence_mapping_queries['foo'][1]} "
+        f"{mapping_query['foo']} {mapping_query['bar']} {query}"
+    )
+
+
+@app.get("/query/mixed-type-params")
+def get_mixed_mapping_mixed_type_query_params(
+    sequence_mapping_queries: Mapping[str, List[int]] = Query({}),
+    mapping_query_str: Mapping[str, str] = Query({}),
+    mapping_query_int: Mapping[str, int] = Query({}),
+    query: int = Query(),
+):
+    return f"foo bar {query} {mapping_query_str}  {mapping_query_int} {dict(sequence_mapping_queries)}"
 
 
 @app.get("/enum-status-code", status_code=http.HTTPStatus.CREATED)

tests/test_query.py

@@ -414,3 +414,27 @@ def test_mapping_query():
     response = client.get("/query/mapping-params/?foo=fuzz&bar=buzz")
     assert response.status_code == 200
     assert response.json() == "foo bar fuzz buzz"
+
+
+def test_mapping_with_non_mapping_query():
+    response = client.get("/query/mixed-params/?foo=fuzz&foo=baz&bar=buzz&query=fizz")
+    assert response.status_code == 200
+    assert response.json() == "foo bar fuzz baz baz buzz fizz"
+
+
+def test_mapping_with_non_mapping_query_mixed_types():
+    response = client.get("/query/mixed-type-params/?foo=fuzz&foo=baz&bar=buzz&query=1")
+    assert response.status_code == 200
+    assert response.json() == "foo bar 1 {'foo': 'baz', 'bar': 'buzz', 'query': '1'}  {'query': '1'} {'foo': [], 'bar': [], 'query': ['1']}"
+
+
+def test_sequence_mapping_query():
+    response = client.get("/query/mapping-sequence-params/?foo=1&foo=2")
+    assert response.status_code == 200
+    assert response.json() == "foo bar {'foo': [1, 2]}"
+
+
+def test_sequence_mapping_query_drops_invalid():
+    response = client.get("/query/mapping-sequence-params/?foo=fuzz&foo=buzz")
+    assert response.status_code == 200
+    assert response.json() == "foo bar {'foo': []}"