2015-12-01 16:33:25,751 ERROR [pyramid_debugtoolbar][Dummy-5] Exception at http://127.0.0.1:8100/foo/92/
traceback url: http://127.0.0.1:8100/_debug_toolbar/exception?token=82a45083705ffd617dd0&tb=3001178604
Traceback (most recent call last):
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid_debugtoolbar/toolbar.py", line 178, in toolbar_tween
    response = _handler(request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid_debugtoolbar/panels/performance.py", line 57, in resource_timer_handler
    result = handler(request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid/tweens.py", line 21, in excview_tween
    response = handler(request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid_tm/__init__.py", line 94, in tm_tween
    reraise(*exc_info)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid_tm/__init__.py", line 82, in tm_tween
    manager.commit()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/transaction/_manager.py", line 111, in commit
    return self.get().commit()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/transaction/_transaction.py", line 263, in commit
    self._prior_operation_failed() # doesn't return
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/transaction/_transaction.py", line 143, in _prior_operation_failed
    self._failure_traceback.getvalue())
TransactionFailedError: An operation previously failed, with traceback:

  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/waitress/task.py", line 74, in handler_thread
    task.service()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/waitress/channel.py", line 337, in service
    task.service()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/waitress/task.py", line 173, in service
    self.execute()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/waitress/task.py", line 392, in execute
    app_iter = self.channel.server.application(env, start_response)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid/router.py", line 242, in __call__
    response = self.invoke_subrequest(request, use_tweens=True)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid/router.py", line 217, in invoke_subrequest
    response = handle_request(request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid_debugtoolbar/toolbar.py", line 178, in toolbar_tween
    response = _handler(request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid_debugtoolbar/panels/performance.py", line 57, in resource_timer_handler
    result = handler(request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid/tweens.py", line 21, in excview_tween
    response = handler(request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid_tm/__init__.py", line 75, in tm_tween
    response = handler(request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid/router.py", line 163, in handle_request
    response = view_callable(context, request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid/config/views.py", line 245, in _secured_view
    return view(context, request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid/config/views.py", line 355, in rendered_view
    result = view(context, request)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/pyramid/config/views.py", line 501, in _requestonly_view
    response = view(request)
  File "/home/niel/projects/master/project/src/project.app/project/app/views.py", line 1837, in fooview
    transaction.commit()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/transaction/_manager.py", line 111, in commit
    return self.get().commit()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/transaction/_transaction.py", line 278, in commit
    t, v, tb = self._saveAndGetCommitishError()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/transaction/_transaction.py", line 271, in commit
    self._commitResources()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/transaction/_transaction.py", line 417, in _commitResources
    reraise(t, v, tb)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/transaction/_transaction.py", line 389, in _commitResources
    rm.tpc_begin(self)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/zope/sqlalchemy/datamanager.py", line 90, in tpc_begin
    self.session.flush()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1985, in flush
    self._flush(objects)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 2103, in _flush
    transaction.rollback(_capture_exception=True)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 2067, in _flush
    flush_context.execute()
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 372, in execute
    rec.execute(self)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 526, in execute
    uow
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 60, in save_obj
    mapper, table, update)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 518, in _emit_update_statements
    execute(statement, params)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 841, in execute
    return meth(self, multiparams, params)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/sql/elements.py", line 322, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 938, in _execute_clauseelement
    compiled_sql, distilled_params
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1070, in _execute_context
    context)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1271, in _handle_dbapi_exception
    exc_info
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/util/compat.py", line 199, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1063, in _execute_context
    context)
  File "/home/niel/projects/master/project/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 442, in do_execute
    cursor.execute(statement, parameters)
IntegrityError: (IntegrityError) NOT NULL constraint failed: bar.fooId u'UPDATE "bar" SET "fooId"=? WHERE "bar"."id" = ?' (None, 5000050)