CRUDkit fixes and changes.

crudkit/core/base.py

@@ -11,26 +11,37 @@ class CRUDMixin:
 
     def as_dict(self, fields: list[str] | None = None):
         """
-        Serialize mapped columns. Honors projection if either:
-            - 'fields' is passed explicitly, or
-            -
+        Serialize the instance.
+            - If 'fields' (possibly dotted) is provided, emit exactly those keys.
+            - Else, if '__crudkit_projection__' is set on the instance, emit those keys.
+            - Else, fall back to all mapped columns on this class hierarchy.
+        Always includes 'id' when present unless explicitly excluded.
         """
-        allowed = None
+        if fields is None:
+            fields = getattr(self, "__crudkit_projection__", None)
+
         if fields:
-            allowed = set(fields)
-        else:
-            allowed = getattr(self, "__crudkit_root_fields__", None)
+            out = {}
+            if "id" not in fields and hasattr(self, "id"):
+                out["id"] = getattr(self, "id")
+            for f in fields:
+                cur = self
+                for part in f.split("."):
+                    if cur is None:
+                        break
+                    cur = getattr(cur, part, None)
+                out[f] = cur
+            return out
+
         result = {}
-        for cls in self.__class__.__mro__:
-            if not hasattr(cls, "__table__"):
-                continue
-            for column in cls.__table__.columns:
-                name = column.name
-                if allowed is not None and name not in allowed and name != "id":
-                    continue
-                result[name] = getattr(self, name)
+        for cls in self.__clas__.__mro__:
+            if hasattr(cls, "__table__"):
+                for column in cls.__table__.columns:
+                    name = column.name
+                    result[name] = getattr(self, name)
         return result
 
+
 class Version(Base):
     __tablename__ = "versions"