- CircularDependencyError now has .cycles and .edges

members, which are the set of elements involved in
one or more cycles, and the set of edges as 2-tuples.
[ticket:1890]

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/sqlalchemy/exc.py b/lib/sqlalchemy/exc.py
index 003969f56..a9bcb7a7e 100644
--- a/lib/sqlalchemy/exc.py
+++ b/lib/sqlalchemy/exc.py
@@ -26,7 +26,11 @@ class ArgumentError(SQLAlchemyError):
 
 class CircularDependencyError(SQLAlchemyError):
     """Raised by topological sorts when a circular dependency is detected"""
-
+    def __init__(self, message, cycles, edges):
+        message += ": cycles: %r all edges: %r" % (cycles, edges)
+        super(CircularDependencyError, self).__init__(message)
+        self.cycles = cycles
+        self.edges = edges
 
 class CompileError(SQLAlchemyError):
     """Raised when an error occurs during SQL compilation"""