generics.complete_object broken

[ipython]

Original Launchpad bug 527968: https://bugs.launchpad.net/ipython/+bug/527968
Reported by: dsdale24 (Darren Dale).

generics.complete_object appears to be broken in the trunk (0.11alpha). It keeps returning TryNext in situations where it should not. As a result, it is proving to be very difficult to support some custom completers with the forthcoming ipython-0.11:

In [12]: generics.complete_object('foo', dir('foo'))
---------------------------------------------------------------------------
TryNext                                   Traceback (most recent call last)

/Users/darren/Projects/phynx.git/<ipython console> in <module>()

/Users/darren/Projects/ipython/IPython/external/simplegeneric.pyc in dispatch(*args, **kw)
     73                 f = _gbt(t, _sentinel)
     74                 if f is not _sentinel:
---> 75                     return f(*args, **kw)
     76             else:
     77                 return func(*args, **kw)

/Users/darren/Projects/ipython/IPython/utils/generics.pyc in complete_object(obj, prev_completions)
     60     own_attrs + prev_completions.
     61     """
---> 62     raise TryNext
     63
     64

TryNext:

[takluyver]

It's not clear if the original reporter was attempting to use this correctly. complete_objects is a generic, and should be extended like this:

@generics.complete_object.when_type(MyClass):
def f(myclass_obj, prev_completions):
    return #Stuff from myclass_obj

(there's also a when_object decorator for specific objects)

The TryNext errors are raised when it doesn't find a matching type or object to dispatch to, and appear to be caught in core/completer.py (line 372). So I'm not sure that this is actually a bug.

[fperez]

I agree with Thomas, closing. This was incorrect usage of the generic, not a bug.