Add ¨id¨ field to anonymous user object

[EABinGA]

I am frequently needing the functionality to allow users to only update their own data and not other peoples data.

In my template I tried something like this according to the pythonic principal of least surprise:

{% ifequal user.id data.author_id %}
    #allow user to do something (e.g. show an edit link)
{% endifequal %}

If the user is anonymous, this fails and shows a traceback, because the anonymous user has not have an ¨id¨ property.

Instead I must write this:

{% if not user.is_anonymous %}{% ifequal user.id data.author_id %}
    # allow user to do something
{% endifequal %}{% endif %}

The same problem arises in view code:

if request.user.is_anonymous() or (request.user.id <> data.author_id):
    # deny access to template and give out error

Suggestion:

If the anonymous user had an ¨id¨ property, the additional checks would not be needed.

The value for this ¨id¨ could be ¨None¨ as not be be mistaken for a real user.

I believe that the User and Anonymoususer objects should behave as similar to each other as possible, and I believe this improves things a bit.

[Adrian Holovaty]

(In [1221]) Fixed #783 -- Added AnonymousUser.id = None. Thanks, EABinGA