dropdown control don't work's fine with table records in Google App Engine

[Leandro Severino]

To reproduce the error, follow a example code:

# in the forms.py
result = data.all_categories() # this method return all records of table category in GAE/big table format.
args = [(row.key().id(), row.title) for row in result]
new_post = form.Form(
    form.Dropdown('category', args),
    form.Textbox('title'),
    form.Textarea('text'),
    form.Dropdown('language', [('pt', 'Portuguese'), ('en', 'English')]),
    form.Button('Submit!')
# in code.py
class Post:
    def GET(self):
        frm = forms.new_post()
        return render.full(render.form(frm))
    def POST(self):
        global last_updated
        frm = forms.new_post()
        if frm.validates(): # in this point the error occurs.
            data.save_entry(frm.d)
            last_updated = data.last_updated()
            raise web.seeother('/')
        else:
            return render.full(render.form(frm))

IMHO the root cause of the problem is the 'big table' format, I say this because the form generated by the GET method is correct(It has the <option value="1">Category A</option>, <option value="2">Category B</option>) but when I submit the form and the forms.validates() is called the error occurs.

The problem occurs in the forms.py in this function:
def attrget(obj, attr, value=None):
    if hasattr(obj, 'has_key') and obj.has_key(attr): return obj[attr]
    if hasattr(obj, attr): return getattr(obj, attr)
    return value

generate this error:
<type 'exceptions.AttributeError'>: 'unicode' object has no attribute 'has_key'
      args = ("'unicode' object has no attribute 'has_key'",)
      message = "'unicode' object has no attribute 'has_key'"

[Leandro Severino (leandro-professionalit)]

I don't know if this is the best approach, but I have a solution to this problem in this thread:
http://groups.google.com/group/webpy/browse_thread/thread/484cb3fadac5de32/94634856c335d001#94634856c335d001