= bug description =

When changing a milestone through the web admin interface, saving changes generates a http 500 error with the following traceback:

{{{
Traceback (most recent call last):
File "/home/tflink/code/blockerbugs/env_blockerbugs/lib/python2.7/site-packages/flask/app.py", line 1701, in call
return self.wsgi_app(environ, start_response)
File "/home/tflink/code/blockerbugs/env_blockerbugs/lib/python2.7/site-packages/flask/app.py", line 1689, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/home/tflink/code/blockerbugs/env_blockerbugs/lib/python2.7/site-packages/flask/app.py", line 1687, in wsgi_app
response = self.full_dispatch_request()
File "/home/tflink/code/blockerbugs/env_blockerbugs/lib/python2.7/site-packages/flask/app.py", line 1360, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/tflink/code/blockerbugs/env_blockerbugs/lib/python2.7/site-packages/flask/app.py", line 1358, in full_dispatch_request
rv = self.dispatch_request()
File "/home/tflink/code/blockerbugs/env_blockerbugs/lib/python2.7/site-packages/flask/app.py", line 1344, in dispatch_request
return self.view_functionsrule.endpoint
File "/home/tflink/code/blockerbugs/blockerbugs/controllers/users.py", line 95, in decorated_function
return f(args, *kwargs)
File "/home/tflink/code/blockerbugs/blockerbugs/controllers/admin.py", line 148, in modify_milestone
milestone.succeeds = selected_succeeds
File "/home/tflink/code/blockerbugs/env_blockerbugs/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 155, in set
instance_dict(instance), value, None)
File "/home/tflink/code/blockerbugs/env_blockerbugs/lib/python2.7/site-packages/sqlalchemy/orm/dynamic.py", line 117, in set
self.set_iterable(state, dict, value)
File "/home/tflink/code/blockerbugs/env_blockerbugs/lib/python2.7/site-packages/sqlalchemy/orm/dynamic.py", line 122, in _set_iterable
new_values = list(iterable)
TypeError: 'Milestone' object is not iterable
}}}

= fix recommendation =

Saving the milestone shouldn't tb and the save operation should complete successfully