What version are you running?
2.5.1.1
What steps will reproduce the problem?

Be using a Perforce repository, post a review using rbt post changeID
Update one of the files in the changelist
Use rbt post changeID


What is the expected output? What do you see instead?
Expected the review to be updated. Instead I see:
rbt post 288474

Generating diff for pending changeset 288474

CRITICAL:
If I enable debug, I see a lot of text, including:
rbt post --debug 288474








RBTools 0.7.5 alpha 0 (dev)

Python 2.7.6 (default, Nov 10 2013, 19:24:18) [MSC v.1500 32 bit (Intel)]

Running on Windows-8-6.2.9200












Checking for a Perforce repository...

Running: p4 info

Running: diff --version












Making HTTP POST request to http://reviewboard/api/review-requests/

Got API Error 204 (HTTP code 409): The commit ID specified has already been used.

Error data: {u'stat': u'fail', u'review_request': {u'status': u'discarded', u'last_updated': u'2015-11-24T09:50:23Z', u'links': {u'diffs': {u'href': u'http://reviewboard/api/review-requests/2035/diffs/', u'method': u'GET'}, u'repository': {u'href': u'http://reviewboard/api/repositories/1/', u'method': u'GET', u'title': u'perforce.domain.com'}, u'changes': {u'href': u'http://reviewboard/api/review-requests/2035/changes/', u'method': u'GET'}, u'self': {u'href': u'http://reviewboard/api/review-requests/2035/', u'method': u'GET'}, u'update': {u'href': u'http://reviewboard/api/review-requests/2035/', u'method': u'PUT'}, u'last_update': {u'href': u'http://reviewboard/api/review-requests/2035/last-update/', u'method': u'GET'}, u'reviews': {u'href': u'http://reviewboard/api/review-requests/2035/reviews/', u'method': u'GET'}, u'draft': {u'href': u'http://reviewboard/api/review-requests/2035/draft/', u'method': u'GET'}, u'file_attachments': {u'href': u'http://reviewboard/api/review-requests/2035/file-attachments/', u'method': u'GET'}, u'submitter': {u'href': u'http://reviewboard/api/users/alexp/', u'method': u'GET', u'title': u'alexp'}, u'delete': {u'href': u'http://reviewboard/api/review-requests/2035/', u'method': u'DELETE'}, u'screenshots': {u'href': u'http://reviewboard/api/review-requests/2035/screenshots/', u'method': u'GET'}, u'diff_context': {u'href': u'http://reviewboard/api/review-requests/2035/diff-context/', u'method': u'GET'}}, u'depends_on': [], u'description_text_type': u'plain', u'issue_resolved_count': 0, u'ship_it_count': 0, u'close_description_text_type': u'plain', u'id': 2035, u'description': u'Adding feature query support.', u'target_people': [], u'changenum': 288474, u'bugs_closed': [u'112512'], u'testing_done_text_type': u'plain', u'testing_done': u'', u'close_description': u'', u'time_added': u'2015-11-24T09:45:03Z', u'extra_data': {u'calculated_trophies': True}, u'public': False, u'commit_id': u'288474', u'blocks': [], u'branch': u'', u'text_type': None, u'issue_open_count': 0, u'approved': False, u'url': u'/r/2035/', u'absolute_url': u'http://reviewboard/r/2035/', u'target_groups': [{u'href': u'http://reviewboard/api/groups/MyTeam/', u'method': u'GET', u'title': u'MyTeam'}], u'summary': u'Adding feature query support.', u'issue_dropped_count': 0, u'approval_failure': u'The review request has not been marked "Ship It!"'}, u'err': {u'msg': u'The commit ID specified has already been used.', u'code': 204}}

Making HTTP GET request to http://reviewboard/api/review-requests/2035/?only-links=diffs%2Cdraft&only-fields=absolute_url%2Cbugs_closed%2Cid%2Cstatus

Cached response for HTTP GET http://reviewboard/api/review-requests/2035/?only-links=diffs%2Cdraft&only-fields=absolute_url%2Cbugs_closed%2Cid%2Cstatus expired and was modified

Traceback (most recent call last):

  File "C:\Program Files (x86)\RBTools\bin..\Python27\Scripts\rbt-script.py", line 8, in <module>

    load_entry_point('RBTools==0.7.5alpha0', 'console_scripts', 'rbt')()

  File "C:\Program Files (x86)\RBTools\Python27\lib\site-packages\rbtools-0.7.5alpha0-py2.7.egg\rbtools\commands\main.py", line 133, in main

    command.run_from_argv([RB_MAIN, command_name] + args)

  File "C:\Program Files (x86)\RBTools\Python27\lib\site-packages\rbtools-0.7.5alpha0-py2.7.egg\rbtools\commands__init__.py", line 622, in run_from_argv

    exit_code = self.main(*args) or 0

  File "C:\Program Files (x86)\RBTools\Python27\lib\site-packages\rbtools-0.7.5alpha0-py2.7.egg\rbtools\commands\post.py", line 800, in main

    base_dir=base_dir)

  File "C:\Program Files (x86)\RBTools\Python27\lib\site-packages\rbtools-0.7.5alpha0-py2.7.egg\rbtools\commands\post.py", line 433, in post_request

    review_request = review_request.update(

  File "C:\Program Files (x86)\RBTools\Python27\lib\site-packages\rbtools-0.7.5alpha0-py2.7.egg\rbtools\api\resource.py", line 301, in getattr

    raise AttributeError

AttributeError



What operating system are you using?
Windows 10
Attach the debug out from the command.
See above.

Please provide any additional information below.