
Traceback (most recent call last):

 "test.py", line 54, in <module>
Blog.posts.impl.get_history(state, dict_, passive=True),

 "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/orm/attributes.py", line 876, in get_history
return History.from_collection(self, state, current)

 "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/orm/attributes.py", line 1345, in from_collection
for c in original
TypeError: 'symbol' object is not iterable
Traceback (most recent call last):


 "C:\Users\S10500\AppData\Local\Continuum\anaconda3\lib\site-packages\spyder\widgets\ipythonconsole\client.py", line 575, in show_time

elapsed_time = time.monotonic() - self.t0
TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'
