Add filtering for dropdowns.

crudkit/core/service.py

@@ -415,6 +415,8 @@ class CRUDService(Generic[T]):
                         opt = opt.load_only(*cols)
                 query = query.options(opt)
 
+        # inside CRUDService._apply_firsthop_strategies
+        # ...
         # NEW: if a first-hop to-one relationship’s target table is present in filter expressions,
         # make sure we actually JOIN it (outer) so filters don’t create a cartesian product.
         if plan.filter_tables:
@@ -422,14 +424,19 @@ class CRUDService(Generic[T]):
             for rel in mapper.relationships:
                 if rel.uselist:
                     continue  # only first-hop to-one here
-                target_tbl = getattr(rel.mapper.class_, "__table__", None)
+                target_cls = rel.mapper.class_
+                target_tbl = getattr(target_cls, "__table__", None)
                 if target_tbl is None:
                     continue
                 if target_tbl in plan.filter_tables:
                     if rel.key in joined_rel_keys:
                         continue  # already joined via join_paths
-                    query = query.join(getattr(root_alias, rel.key), isouter=True)
+
+                    # alias when joining same-entity relationships (User->User supervisor)
+                    ta = aliased(target_cls) if target_cls is self.model else target_cls
+                    query = query.join(getattr(root_alias, rel.key).of_type(ta), isouter=True)
                     joined_rel_keys.add(rel.key)
+
         if log.isEnabledFor(logging.DEBUG):
             info = []
             for base_alias, rel_attr, target_alias in plan.join_paths:

crudkit/ui/fragments.py

@@ -11,6 +11,8 @@ from sqlalchemy.orm.base import NO_VALUE
 from sqlalchemy.orm.properties import ColumnProperty, RelationshipProperty
 from typing import Any, Dict, List, Optional, Tuple
 
+import crudkit
+
 _ALLOWED_ATTRS = {
     "class", "placeholder", "autocomplete", "inputmode", "pattern",
     "min", "max", "step", "maxlength", "minlength",
@@ -107,6 +109,53 @@ def register_template_globals(app=None):
             app.add_template_global(fn, name)
             installed.add(name)
 
+def _fields_for_label_params(label_spec, related_model):
+    """
+    Build a 'fields' list suitable for CRUDService.list() so labels render
+    without triggering lazy loads. Always includes 'id'.
+    """
+    simple_cols, rel_paths = _extract_label_requirements(label_spec, related_model)
+    fields = set(["id"])
+    for c in simple_cols:
+        fields.add(c)
+    for rel_name, col_name in rel_paths:
+        if col_name == "__all__":
+            # just ensure relationship object is present; ask for rel.id
+            fields.add(f"{rel_name}.id")
+        else:
+            fields.add(f"{rel_name}.{col_name}")
+    return list(fields)
+
+def _fk_options_via_service(related_model, label_spec, *, options_params: dict | None = None):
+    svc = crudkit.crud.get_service(related_model)
+
+    # default to unlimited results for dropdowns
+    params = {"limit": 0}
+    if options_params:
+        params.update(options_params)  # caller can override limit if needed
+
+    # ensure fields needed to render the label are present (avoid lazy loads)
+    fields = _fields_for_label_params(label_spec, related_model)
+    if fields:
+        existing = params.get("fields")
+        if isinstance(existing, str):
+            existing = [s.strip() for s in existing.split(",") if s.strip()]
+        if isinstance(existing, (list, tuple)):
+            params["fields"] = list(dict.fromkeys(list(existing) + fields))
+        else:
+            params["fields"] = fields
+
+    # only set a default sort if caller didn’t supply one
+    if "sort" not in params:
+        simple_cols, _ = _extract_label_requirements(label_spec, related_model)
+        params["sort"] = (simple_cols[0] if simple_cols else "id")
+
+    rows = svc.list(params)
+    return [
+        {"value": str(r.id), "label": _label_from_obj(r, label_spec)}
+        for r in rows
+    ]
+
 def expand_projection(model_cls, fields):
     req = getattr(model_cls, "__crudkit_field_requires__", {}) or {}
     out = set(fields)
@@ -647,10 +696,12 @@ def _normalize_field_spec(spec, mapper, session, label_specs_model_default):
     if "label_deps" in spec:
         field["label_deps"] = spec["label_deps"]
 
+    opts_params = spec.get("options_params") or spec.get("options_filter") or spec.get("options_where")
+
     if rel_prop:
         if field["type"] is None:
             field["type"] = "select"
-        if field["type"] == "select" and field.get("options") is None and session is not None:
+        if field["type"] == "select" and field.get("options") is None:
             related_model = rel_prop.mapper.class_
             label_spec = (
                 spec.get("label_spec")
@@ -658,7 +709,11 @@ def _normalize_field_spec(spec, mapper, session, label_specs_model_default):
                 or getattr(related_model, "__crud_label__", None)
                 or "id"
             )
-            field["options"] = _fk_options(session, related_model, label_spec)
+            field["options"] = _fk_options_via_service(
+                related_model,
+                label_spec,
+                options_params=opts_params
+            )
         return field
 
     col = mapper.columns.get(name)