- an approach I like better, remove most adapt() methods and use a generic

copier
- mssql reflection fix, but this will come in again from the tip merge

2 files changed, 15 insertions, 1 deletions

diff --git a/lib/sqlalchemy/util/__init__.py b/lib/sqlalchemy/util/__init__.py
index 9119e35b7..ae1eb3ac5 100644
--- a/lib/sqlalchemy/util/__init__.py
+++ b/lib/sqlalchemy/util/__init__.py
@@ -24,7 +24,8 @@ from langhelpers import iterate_attributes, class_hierarchy, \
     reset_memoized, group_expirable_memoized_property, importlater, \
     monkeypatch_proxied_specials, asbool, bool_or_str, coerce_kw_type,\
     duck_type_collection, assert_arg_type, symbol, dictlike_iteritems,\
-    classproperty, set_creation_order, warn_exception, warn, NoneType
+    classproperty, set_creation_order, warn_exception, warn, NoneType,\
+    constructor_copy
 
 from deprecations import warn_deprecated, warn_pending_deprecation, \
     deprecated, pending_deprecation
diff --git a/lib/sqlalchemy/util/langhelpers.py b/lib/sqlalchemy/util/langhelpers.py
index d85793ee0..945e2a6bd 100644
--- a/lib/sqlalchemy/util/langhelpers.py
+++ b/lib/sqlalchemy/util/langhelpers.py
@@ -516,6 +516,19 @@ def coerce_kw_type(kw, key, type_, flexi_bool=True):
         else:
             kw[key] = type_(kw[key])
 
+
+def constructor_copy(obj, cls, **kw):
+    """Instantiate cls using the __dict__ of obj as constructor arguments.
+    
+    Uses inspect to match the named arguments of ``cls``.
+    
+    """
+    
+    names = get_cls_kwargs(cls)
+    kw.update((k, obj.__dict__[k]) for k in names if k in obj.__dict__)
+    return cls(**kw)
+
+
 def duck_type_collection(specimen, default=None):
     """Given an instance or class, guess if it is or is acting as one of
     the basic collection types: list, set and dict.  If the __emulates__