Add sortable=True to all properties

openapi/openapi.json

@@ -1107,7 +1107,7 @@
           "sortable": {
             "title": "Sortable",
             "type": "boolean",
-            "description": "defines whether the entry property can be used for sorting with the \"sort\" parameter. If the entry listing endpoint supports sorting, this key MUST be present for all properties."
+            "description": "defines whether the entry property can be used for sorting with the \"sort\" parameter. If the entry listing endpoint supports sorting, this key MUST be present for sortable properties with value `true`."
           }
         }
       },

optimade/models/entries.py

@@ -146,7 +146,8 @@ class EntryInfoProperty(BaseModel):
 
     sortable: Optional[bool] = Field(
         None,
-        description='defines whether the entry property can be used for sorting with the "sort" parameter. If the entry listing endpoint supports sorting, this key MUST be present for all properties.',
+        description='defines whether the entry property can be used for sorting with the "sort" parameter. '
+        "If the entry listing endpoint supports sorting, this key MUST be present for sortable properties with value `true`.",
     )
 
 

optimade/server/routers/utils.py

@@ -282,6 +282,9 @@ def retrieve_queryable_properties(schema: dict, queryable_properties: list) -> d
                 properties[name] = {"description": value.get("description", "")}
                 if "unit" in value:
                     properties[name]["unit"] = value["unit"]
+                # All properties are sortable with the MongoDB backend.
+                # While the result for sorting lists may not be as expected, they are still sorted.
+                properties[name]["sortable"] = True
     return properties