improved handling of exceptions upon __init__(): will preserve the stack

trace of the original __init__ exception; errors raised during session.expunge() will be
reported as warnings

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/sqlalchemy/util.py b/lib/sqlalchemy/util.py
index ea5a468d2..0d66080ac 100644
--- a/lib/sqlalchemy/util.py
+++ b/lib/sqlalchemy/util.py
@@ -11,6 +11,8 @@ except ImportError:
     import dummy_threading as threading
 
 import md5
+import sys
+import warnings
 
 import __builtin__
 
@@ -127,6 +129,13 @@ def duck_type_collection(col, default=None):
     else:
         return default
     
+def warn_exception(func):
+    """executes the given function, catches all exceptions and converts to a warning."""
+    try:
+        return func()
+    except:
+        warnings.warn(RuntimeWarning("%s('%s') ignored" % sys.exc_info()[0:2]))
+    
 class SimpleProperty(object):
     """A *default* property accessor."""