在烧瓶中使用带有参数的url_for函数时重定向循环

Question

I get a redirect loop when I try to use the redirect and url_for functions in flask as follows:

@app.route('/edit/<id>' , methods=['POST', 'GET'])
def edit (id):
#Getting user by primary key:
post = Post.query.get(id)
if request.method == 'POST':        
    post.title = request.form['title']
    post.text =  request.form['text']
    db.session.commit()
    flash('New entry was successfully posted')     

return redirect(url_for('edit',  id=id, post=post))

Update: Solved http://techarena51.com/index.php/flask-sqlalchemy-tutorial/

Answer 1

I presume you only want to redirect if the user submitted a POST request? I think your code should be:

@app.route('/edit/<id>' , methods=['POST', 'GET'])
def edit (id):
#Getting user by primary key:
post = Post.query.get(id)
if request.method == 'POST':        
    post.title = request.form['title']
    post.text =  request.form['text']
    db.session.commit()
    flash('New entry was successfully posted')     
    return redirect(url_for('edit',  id=id, post=post))

# The rest of this code is executed when a GET is performed
return render_template("edit.html",id=id, post=post)

otherwise, yes, your current code will redirect to the same route every time it is accessed. I've updated my example to show how you need to render the edit template when the request method is not POST.