Flask 将值传递给 POST 方法

Question

I need to pass the feature_id value when the request is POST. but I get a null value from the following code.

@app.route("/add_user_story", methods=["GET", "POST"])
@login_required
def add_user_story():
    feature_id=request.args.get("feature_id")
    print(feature_id)
    if request.method == "POST":
        
        user_story = User_stories(
            user_id=session["user"],
            feature_id =feature_id,
            as_a=request.form.get("as_a"),
            i_want=request.form.get("i_want"),
            so_that=request.form.get("so_that"),
            given=request.form.get("given"),
            when=request.form.get("when"),
            then=request.form.get("then")
        )
        db.session.add(user_story)
        db.session.commit()
        
    return render_template("logged_in/add_user_story.html") 

I have checked the terminal and my print statement has the value so I know it getting that far, To test if the form works I have replaced feature_id =feature_id with feature_id =24, and it successfully posted the data.

I have also tried

# LOGGED IN - Add User Story
@app.route("/add_user_story", methods=["GET", "POST"])
@login_required
def add_user_story():
    if request.method == "POST":
        
        user_story = User_stories(
            user_id=session["user"],
            feature_id=request.args.get("feature_id"),
            as_a=request.form.get("as_a"),
            i_want=request.form.get("i_want"),
            so_that=request.form.get("so_that"),
            given=request.form.get("given"),
            when=request.form.get("when"),
            then=request.form.get("then")
        )
        db.session.add(user_story)
        db.session.commit()
        
    return render_template("logged_in/add_user_story.html")

Answer 1

request.args.get is used with 'GET' method usually, then either put it in URL and function's parameter:

@app.route("/add_user_story/<int:feature_id>", methods=["GET", "POST"])
@login_required
def add_user_story(feature_id): # functions gets a parameter
    feature_id=request.args.get("feature_id")
    print(feature_id)
    if request.method == "POST":

or (the best way for post) add new input with defined value in your form:

<input type="hidden" name="feature_id" id="feature_id" value="24">

Answer 2

The request.args only contains data that are passed in the query string. The query string is the part of the URL after the "?". example:

example.com?q="data"

result = request.args.get("q"), result will contain "data".

So using request.args or request.form or request.get_json() all depend on your post request.