launchpad-dev team mailing list archive

[Bryce Harrington <bryce@xxxxxxxxxxxxx>]

On Sun, Feb 19, 2012 at 12:55:49AM +0100, Eike Welk wrote:
> I'm getting unexpected errors in a Python program that uses Launchpadlib.
> 
> When the program wants to change attributes of a bug, it must first read one 
> attribute of the bug; otherwise the program fails with an exception from deep 
> inside Launchpadlib. 
> 
> I suspect that I use Launchpadlib in an unintended way. What is the right way 
> to change attributes in Launchpad? Is there an official way to prepare 
> objects, so that their attributes can be changed?
> 
> Here is an example that illustrates the odd behavior:
> 
> 
> from launchpadlib.launchpad import Launchpad
> launchpad = Launchpad.login_with("bug-repo-syncer", "production")

If you only care about the bug, then instead of this:

> lp_task = launchpad.load(
>     'https://api.launchpad.net/1.0/bug-repo-syncer/+bug/934181')
> lp_bug = lp_task.bug

try:

  lp_bug = launchpad.bugs[934181]
  lp_task = lp_bug.bug_tasks[0]


Alternatively (this is a common idiom):

  brs = launchpad.projects['bug-repo-syncer']
  for lp_task in brs.searchTasks(assignee=launchpad.me):
      lp_bug = lp_task.bug
      #...

> #Un-commenting this makes the error go away.
> #lp_bug = launchpad.load("https://api.launchpad.net/1.0/bugs/934181";)
> 
> #Un-commenting this makes the error go away too.
> #lp_bug.title   
> 
> lp_bug.title = "Test bug"
> lp_bug.description = "A bug for testing Launchpadlib."
> 
> 
> #Fails with:
> #Traceback (most recent call last):
> #  File "lp_problem.py", line 8, in <module>
> #    lp_bug.title = "Test bug"
> #  File "/usr/local/lib/python2.7/
> #site-packages/lazr/restfulclient/resource.py", line 692, in __setattr__
> #    if not self.lp_has_parameter(name):
> #  File "/usr/local/lib/python2.7/
> #site-packages/lazr/restfulclient/resource.py", line 206, in lp_has_parameter
> #    return self._get_external_param_name(param_name) is not None
> #  File "/usr/local/lib/python2.7/
> #site-packages/lazr/restfulclient/resource.py", line 349, in
> # _get_external_param_name
> #    if self._wadl_resource.get_parameter(name):
> #  File "/usr/local/lib/python2.7/site-packages/wadllib/application.py", 
> #line 452, in get_parameter
> #    definition = self._find_representation_definition(media_type)
> #  File "/usr/local/lib/python2.7/site-packages/wadllib/application.py", 
> #line 564, in _find_representation_definition
> #    "Resource is not bound to any representation, and no media "
> #wadllib.application.NoBoundRepresentationError: Resource is not bound to any
> # representation, and no media media type was specified.
> 
> 
> Eike.
> 
> 
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