Can't correctly receive data in Django from Ajax

Question

I wand to receive array data in Django view from jquery/Ajax request but in some reason I cannot correctly do it. This is the piece of js code:

    var arr = [1, 2];
    $.ajax({
        type: 'POST',
        url: '/go/',
        data: {arr: arr},
        success: function (data) {
        console.log('Success!');
        },
    });

And this is from Django view:

def go(request):
  if request.method == 'POST':
    arr = request.POST['arr']

It gives me KeyError: 'arr'

If I do print(request.POST) in Django it prints it like this: <QueryDict: {'arr[]': ['1', '2']}> . Some square brackets appear after 'arr' key. Then if I do arr = request.POST['arr[]'] using the key with square brackets it assings arr value 2 , so only the last value of the array. Can someone please explain to me why this is happening?

Answer 1

The name of the key is 'arr[]' , since it contains an array , so you access this with:

def go(request):
  if request.method == 'POST':
    arr = request.POST.

You need to use .getlist(…) [Django-doc] to retrieve all values, since the different elements are all passed as individual key-value items.

Answer 2

您正在传递一个列表，因此需要使用 getlist 方法来检索数据。