This introduces an uglt regression.

crudkit/core/meta.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+from functools import lru_cache
+from typing import NamedTuple, Any, Dict, Tuple
+from sqlalchemy import inspect
+from sqlalchemy.orm import Mapper
+
+class RelInfo(NamedTuple):
+    key: str
+    uselist: bool
+    target_cls: type | None
+
+@lru_cache(maxsize=512)
+def mapper_info(model: type) -> Dict[str, Any]:
+    m: Mapper = inspect(model)
+    cols = tuple(prop.key for prop in m.column_attrs)
+    rels = { r.key: RelInfo(r.key, bool(r.uselist), getattr(r.mapper, "class_", None))
+             for r in m.relationships }
+    pks = tuple(c.key for c in m.primary_key)
+    table = getattr(model, "__table__", None)
+    return {"cols": cols, "rels": rels, "pks": pks, "table": table}
+
+def rel_map(model: type) -> Dict[str, RelInfo]:
+    return mapper_info(model)["rels"]
+
+def column_names_for_model(model: type) -> Tuple[str, ...]:
+    return mapper_info(model)["col"]