def save(self, doc):
        if doc.id:
            return self.update(doc)
        else:
            return self.insert(doc)
def select_all(self, event=None):
        self.tag_add(SEL, "1.0", "end-1c")
        self.mark_set(INSERT, "1.0")
        self.see(INSERT)
        return "break"