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Diffstat (limited to 'lib/sqlalchemy/ext/declarative/base.py')
| -rw-r--r-- | lib/sqlalchemy/ext/declarative/base.py | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/sqlalchemy/ext/declarative/base.py b/lib/sqlalchemy/ext/declarative/base.py index eb66f12b6..0e68faa03 100644 --- a/lib/sqlalchemy/ext/declarative/base.py +++ b/lib/sqlalchemy/ext/declarative/base.py @@ -73,7 +73,10 @@ def _as_declarative(cls, classname, dict_): # don't even invoke __mapper_args__ until # after we've determined everything about the # mapped table. - mapper_args_fn = lambda: cls.__mapper_args__ + # make a copy of it so a class-level dictionary + # is not overwritten when we update column-based + # arguments. + mapper_args_fn = lambda: dict(cls.__mapper_args__) elif name == '__tablename__': if not tablename and ( not class_mapped or |