python-flask db.session.commit() 不起作用

Question

问题是当用户尝试“忘记密码”选项时。它创建新的 reset_key 进行验证，但新 key 未更新到数据库中。

@app.route('/login/forgot/', methods=['GET', 'POST'])
def forgot():
   form = ResetLoginForm(request.form)
   #There's no session yet. User just pointing to /login/forgot url.

   if request.method == 'POST' and form.validate():
      user = User.query.filter_by(email=form.email.data).first()

   if not user:
     flash('The username or email incorrect')
     return render_template('forgot.html', form=form)

   reset_key = generate_key() ## this creates a new key, but how update  this key into db?
   #tried something like 
   user.reset_key = reset_key 
   db.session.add(user)
   db.session.commit()
   #this is not working. Is it due to session is not started or something?

感谢您的帮助或提示。

Answer 1

这是因为 User.query.filter_by(email=form.email.data).first() 将返回 sqlalchemy.orm.query.Query 对象。正如其文档所说:

Query is the source of all SELECT statements generated by the ORM, both those formulated by end-user query operations as well as by high level internal operations such as related collection loading. It features a generative interface whereby successive calls return a new Query object, a copy of the former with additional criteria and options associated with it.

所以你只是得到一个复制的对象，所以你的更改将不起作用；

你可以这样使用:user = db.session.query(User).filter_by(email==form.email.data).first()然后您可以更改用户属性