Django can only concatenate str (not "list") to str - django

Question

Django can only concatenate str (not "list") to str
Error Messages.......
I have some code like this:
function form_submit() {
var arr_category = new Array();
var arr_lawyer = new Array();
var data = new Object();
$('input[name^="category_idx"]').each(function() {
arr_category.push($(this).val());
});
$('input[name^="lawyer_idx"]').each(function() {
arr_lawyer.push($(this).val());
});
console.log("arr_category=="+arr_category);
console.log("arr_lawyer=="+arr_lawyer);
if (confirm('edit??') == true) {
data.arr_category = arr_category;
data.arr_lawyer = arr_lawyer;
call_ajax('/admin/lawyer/recommend_add', data);
//alert("arr_lawyer=="+arr_lawyer);
}
}
Am I doing well in jquery?
look at console.log
arr_category==1,2,3,4,5,6,7,8,9
arr_lawyer==64,37,57,58,130,62,38,51,110
admin_view.py
#csrf_exempt
def recommend_add(request):
print("TEST BANG VALUE------------")
if request.is_ajax() and request.method == "POST":
arr_category = request.GET.getlist('arr_category[]')
print("arr_category------------" + arr_category)
code = 0
msg = "TEST."
data = json.dumps({
'code': code,
'msg': msg,
#'retURL': retURL
})
return HttpResponse(data, content_type='application/json')
I want to print.
error message
TypeError: can only concatenate str (not "list") to str
How can I do that?

Answer 1

In case if you want to return a python interpreter error message to jquery's ajax call then you can use the below syntax.
def recommend_add(request):
print("TEST BANG VALUE------------")
if request.is_ajax() and request.method == "POST":
try:
arr_category = request.GET.getlist('arr_category[]')
print("arr_category------------" + arr_category)
code = 0
msg = "Success"
except Exception as e:
code = '' # anything you want as per your internal logic in case of error.
msg = str(e)
data = json.dumps({
'code': code,
'msg': msg,
#'retURL': retURL
})
return HttpResponse(data, content_type='application/json')
Please ignore my indentation.

Answer 2

in your print code try this
print("arr_category------------:", arr_category)