Question

我正在使用PostgreSQL数据库在烧瓶中开发一个书评网络应用程序。但是，我停留在如何登录用户和跟踪他们的会话的问题上，一旦用户登录，就必须将他带到html页面，在那里他可以搜索书并添加评论。我知道我们可以在烧瓶中使用sessions。但是，我对如何做感到很困惑。

application.py

@app.route("/signin",methods=["GET","POST"])
def signin():
    if request.method=="GET":
        session["user_id"] = user_id     #ERROR ON THIS LINE
        return render_template("login.html")
    else:
        return render_template("search.html")

我在数据库中的users表存储了用户名，密码和user_id

 Table "public.users"
  Column  |         Type          | Collation | Nullable |                Default                 
----------+-----------------------+-----------+----------+----------------------------------------
 username | character varying(30) |           | not null | ''::character varying
 password | character varying(30) |           | not null | ''::character varying
 user_id  | integer               |           | not null | nextval('users_user_id_seq'::regclass)
Indexes:
    "users_pkey" PRIMARY KEY, btree (user_id)

Answer 1

我不确定您从何处获取user_id变量，但是使用会话的语法正确。除了在GET请求中分配session["user_id"]之外，您还可以在成功发布后分配它，如下所示：

@app.route("/signin",methods=["GET","POST"])
def signin():
    if request.method=="GET":
        return render_template("login.html")
    else:
        # assuming you have an html form with <input type="text" name="username"> and <input type="password" name="password"> 
        username = request.form.get("username") # from your login form
        password = request.form.get("password") 
        # verify the username and password here to see if they are in the database then return the id of the person 
        # if the id is an integer then you can do this:
        session["user_id"] = user_id # from the database
        #instead of using the same endpoint, I'd suggest redirecting to a different endpoint that renders the search.html while checking the session for the userid
        return redirect(url_for("search"))


@app.route("/search")
def search():
  if "user_id" in session:
      return render_template("search.html")
  else:
      return redirect(url_for("signin"))

用户注册后如何在我的flask Web应用程序中登录？

1 个答案: