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-rw-r--r--lib/sqlalchemy/orm/mapper.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py
index 6d79f6cd5..f8cf4e6ed 100644
--- a/lib/sqlalchemy/orm/mapper.py
+++ b/lib/sqlalchemy/orm/mapper.py
@@ -347,7 +347,9 @@ class Mapper(object):
_COMPILE_MUTEX.acquire()
global _already_compiling
if _already_compiling:
- self.__initialize_properties()
+ # re-entrance to compile() occurs rarely, when a class-mapped construct is
+ # used within a ForeignKey, something that is possible
+ # when using the declarative layer
return
_already_compiling = True
try: