Autocomplete with Django and AJAX

main.js

$("#input").autocomplete({
	minLength: 1,
	source: function(req, add){
		var search=$("#input").val();
		$.ajax({
			url: '/your-url/',
			async: true,
			dataType: 'json',
			type: 'GET',
			data: {'start': search,},
			success: function(data){
				var suggestions=[];

				$.each(data, function(index, object){
					suggestions.push(object.username);
				});

				add(suggestions);

			},
			error: function(){
				alert("Error!");
			}
		});
	}
});

view.py

import json

def your-view(request):
    if request.is_ajax:
        input_username = request.GET.get('start', '')

        users = User.objects.filter(
            Q(username__icontains=input_username) |
            Q(id__icontains=input_username)
        ).order_by('username')[:5]

        results=[]

        for User in users:
            User_json={}
            User_json['username']=User.username
            results.append(User_json)

        data_json=json.dumps(results)

    else:
        data_json='fail'
    mimetype="application/json"

    return HttpResponse(data_json, mimetype)