Fix: Verify string lengths when creating model objects

pyjeeves/models/ext.py

@@ -1,5 +1,4 @@
-from sqlalchemy.ext.instrumentation import InstrumentationManager
-# from sqlalchemy.orm.interfaces import AttributeExtension
+
 from sqlalchemy.orm import ColumnProperty
 from sqlalchemy.types import String
 from sqlalchemy import event
@@ -28,18 +27,17 @@ class JeevesDBError(Error):
         self.message = message
 
 
-class InstallValidatorListeners(InstrumentationManager):
-    def post_configure_attribute(self, class_, key, inst):
-        """Add validators for any attributes that can be validated."""
-        prop = inst.prop
-        # Only interested in simple columns, not relations
-        if isinstance(prop, ColumnProperty) and len(prop.columns) == 1:
-            col = prop.columns[0]
-            # if we have string column with a length, create a length validator listner
-            if isinstance(col.type, String) and col.type.length:
-                event.listen(
-                    getattr(class_, key), 'set', LengthValidator(
-                        col.name, col.type.length), retval=True)
+def install_validator_listner(class_, key, inst):
+    """Add validators for any attributes that can be validated."""
+    prop = inst.prop
+    # Only interested in simple columns, not relations
+    if isinstance(prop, ColumnProperty) and len(prop.columns) == 1:
+        col = prop.columns[0]
+        # if we have string column with a length, create a length validator listner
+        if isinstance(col.type, String) and col.type.length:
+            event.listen(
+                getattr(class_, key), 'set', LengthValidator(
+                    col.name, col.type.length), retval=True)
 
 
 class LengthValidator():
@@ -51,5 +49,6 @@ class LengthValidator():
         if len(value) > self.max_length:
             raise ValidationError(
                 "%s.%s: Length %d exceeds allowed %d" % (
-                    state.__class__.__name__, self.col_name, len(value), self.max_length))
+                    state.__class__.__name__, state.__class__._map_columns(self.col_name),
+                    len(value), self.max_length))
         return value