AttributeError exception when accessing current user using Parse Server

EDIT FOR FUTURE: see https://github.com/milesrichardson/ParsePy/issues/155#issuecomment-271482650 for solution

Using Parse Server, I am encountering a crash at line 442 in datatypes.py setattr(self, key, ParseType.convert_from_parse(key, value)) when retrieving the currently logged in user. The user object appears to be being loaded correctly, looking at both the server logs and the error page from my (Django) app.

This only happens using the self-hosted server, not the Parse service.

[francisjervis]

Confirming this is working on my end, thanks for such a quick fix!

[milesrichardson]

@francisjervis This should be fixed now. You can install from master like pip install git+https://github.com/milesrichardson/ParsePy

Since I included a link to this issue in a comment at the location of the fix in the code, I’m putting the solution in this comment.

The problem was that setattr(self, key, ParseType.convert_from_parse(key, value)) was trying to set the attribute className on class ParseResource, but className conflicts with the existing ParseResource property:

    @property
    def className(self):
        return self.__class__.__name__

The offending code:

for key, value in six.iteritems(args):
    setattr(self, key, ParseType.convert_from_parse(key, value))

As far as I can see there were two solutions:

1. Hard code an exception (no pun intended…) for the className attribute:

for key, value in six.iteritems(args):
    if key == 'className':
        continue
    setattr(self, key, ParseType.convert_from_parse(key, value))

1. Skip any AttributeError

for key, value in six.iteritems(args):
    try:
        setattr(self, key, ParseType.convert_from_parse(key, value))
    except AttributeError:
        continue

I chose solution 2 because it’s more “future proof” in the case that there are any other attributes that conflict with existing properties of the ParseResource object.

As an aside, the reason this happened only with User objects is that User is derived from ParseResource, which has the conflicting className property, but all other objects are derived from Object, which does not have the conflicting className property.