fix(search): preserve search params in ids-based eodag requests

Keep request parameters in ids mode so per-id searches still apply query/filter/sort/provider constraints.
Add a regression test for ids plus query.federation:backends forwarding.

Author: alambare

stac_fastapi/eodag/core.py

@@ -609,12 +609,13 @@ def prepare_search_base_args(search_request: BaseSearchPostRequest) -> dict[str,
     :param model: the model used to validate stac metadata
     :returns: a dictionary containing arguments for the eodag search
     """
-    if search_request.ids is None:
-        base_args = search_request.model_dump()
+    base_args = search_request.model_dump()
+
+    if search_request.ids:
+        base_args.pop("limit", None)
+    else:
         base_args["raise_errors"] = False
         base_args["count"] = get_settings().count
-    else:
-        base_args = {}
 
     # parse "sortby" search request attribute if it exists to make it work for an eodag search
     sort_by = {}

tests/test_search.py

@@ -544,6 +544,34 @@ async def test_ids_post_search(request_valid, defaults):
     )
 
 
+async def test_ids_post_search_keeps_provider_from_query(request_valid, defaults):
+    """POST ids search must keep provider parsed from query federation:backends."""
+    await request_valid(
+        "search",
+        method="POST",
+        post_data={
+            "collections": [defaults.collection],
+            "ids": ["foo", "bar"],
+            "query": {"federation:backends": {"eq": "cop_dataspace"}},
+        },
+        search_call_count=2,
+        expected_search_kwargs=[
+            {
+                "id": "foo",
+                "collection": defaults.collection,
+                "provider": "cop_dataspace",
+                "validate": True,
+            },
+            {
+                "id": "bar",
+                "collection": defaults.collection,
+                "provider": "cop_dataspace",
+                "validate": True,
+            },
+        ],
+    )
+
+
 # TODO: add test_provider_prefix_post_search when feature is ready