类型错误：尝试在会话中存储用户 ID 时，“ResultProxy”对象不支持索引

Question

在我的Signedup路线中，我试图将用户 ID 存储在会话中并自动登录用户，但是当我尝试这样做时，我收到此错误：

TypeError: object of type 'ResultProxy' does not support indexing

而且，在我的signin路线中，我试图记住哪个用户已登录，但在这里出现错误：

TypeError: object of type 'ResultProxy' has no len()

signedup 路线 application.py

@app.route("/signedup",methods=["GET","POST"])
def signedup():
    if request.method=="POST":
        password = request.form.get("password")
        hash = pwd_context.encrypt(password)


        name = request.form.get("name")



        if not name:
            return "must provide username"
        elif not password:
            return "must provide password"



        registration = db.execute("INSERT INTO users (username,password) VALUES (:username,:password)",
                    {"username":name,"password":hash})

        if not registration:
            return "pick a different username"


        # Store their ID in session and log them in automatically

     user_id = db.execute("SELECT user_id FROM users where username = :username",{"username":name})        
            # It means something like - "give me the first row in result

            # and retrieve the value of the key "id"
#ERROR
            session["user_id"] = user_id[0]["id"]      
            db.commit()

            return render_template("success.html",name = name)
        else:
            return render_template("signup.html")

signin 路线 application.py

@app.route("/signin",methods=["GET","POST"])
def signin():
    # LOG A USER IN
    #forget any user_id
    session.clear()

    if request.method == "GET":
        return render_template("login.html")

    else:
        user_name = request.form.get("username")

        # ensure username is provided
        if not request.form.get("username"):
            return "must provide username"

        # ensure password is provided
        elif not request.form.get("password"):
            return "must provide password"


        # query the database for the username
        rows = db.execute("SELECT * FROM users where username = :username",{"username":user_name})

        # ensure username exists 
        if len(rows) != 1 or not pwd_context.verify(request.form.get("password"),rows[0]["hash"]):
            return "Invalid username"

        # remember which user has logged in 
        session["user_id"] = rows[0]["id"]

Answer 1

我有同样的错误并通过在 db.execute 命令的末尾添加 .fetchone() 来解决：

user_id = db.execute("SELECT user_id FROM users where username = :username",{"username":name}).fetchone()

您必须使用 .fetchone （返回单个结果）或 .fetchall （返回所有结果）才能使用 SQLAlchemy 命令返回的 resultProxy 对象的索引。