code: def update(self, id):
          
          # url('DataStores', id=ID)
          content = request.environ['wsgi.input'].read(int(request.environ['CONTENT_LENGTH']))
          content = content.decode('utf8')
          content = simplejson.loads(content)        
          result = meta.Session.query(DataStore).get(id)
          result.name = content['name']
          result.type = content['type']
          result.ogrstring = content['ogrstring']
          meta.Session.commit()
          response.status = 201
docs: PUT /datastores/id: Update an existing item.