Ensure MPIDs are returned by find_structure

mp_api/client/routes/materials/materials.py

@@ -304,12 +304,17 @@ def find_structure(
             use_document_model=False,
         ).get("data")
 
-        if len(results) > 1:  # type: ignore
+        if not results:
+            return []
+
+        material_ids = validate_ids([doc["material_id"] for doc in results])
+
+        if len(material_ids) > 1:  # type: ignore
             if not allow_multiple_results:
                 raise ValueError(
                     "Multiple matches found for this combination of tolerances, but "
                     "`allow_multiple_results` set to False."
                 )
-            return results  # type: ignore
+            return material_ids  # type: ignore
 
-        return results[0]["material_id"] if (results and results[0]) else []
+        return material_ids[0]

tests/test_mprester.py

@@ -96,16 +96,14 @@ def test_get_structures(self, mpr):
         structs = mpr.get_structures("Mn-O", final=False)
         assert len(structs) > 0
 
-    @pytest.mark.skip(reason="Endpoint issues")
     def test_find_structure(self, mpr):
         path = os.path.join(MAPIClientSettings().TEST_FILES, "Si_mp_149.cif")
-        with open(path) as file:
-            data = mpr.find_structure(path)
-            assert len(data) > 0
+        data = mpr.find_structure(path)
+        assert isinstance(data, str) and data == "mp-149"
 
-            s = CifParser(file).get_structures()[0]
-            data = mpr.find_structure(s)
-            assert len(data) > 0
+        s = CifParser(path).get_structures()[0]
+        data = mpr.find_structure(s)
+        assert isinstance(data, str) and data == "mp-149"
 
     def test_get_bandstructure_by_material_id(self, mpr):
         bs = mpr.get_bandstructure_by_material_id("mp-149")