Question

I tried the following code and it didn’t work:

class SourceUpdate(webapp.RequestHandler):
  def post(self):
    id = int(self.request.get('id'))
    source = Source.get_by_id(id)
    for property in self.request.arguments():
      if property != 'id':
        source.__dict__[property] = self.request.get(property)
    source.put()
    self.redirect('/source')

I am posting all the necessary properties but the entry isn’t updated, and no error is shown. How to fix it?

BTW

class Source(db.Model):
  #some string properties

Answer 1

You’re bypassing the __setattr__-like functionality that the models’ metaclass (type(type(source))) is normally using to deal with attribute-setting properly. Change your inner loop to:

for property in self.request.arguments():
  if property != 'id':
    setattr(source, property, self.request.get(property))

and everything should work (if all the types of properties can be properly set from a string, since that’s what you’ll get from request.get).