使用 Django 时如何从我的 json.dumps 文件中恢复整数（用于在我的 javascript 图表中显示）

Question

In my Django application, I have a very basic Pie Chart model with the name column as a CharField and the stats column as an IntegerField. I also have some javascript code on my html page that displays a pie chart -- but I'm only able to get it working if I hardcode the values as an array. I was hoping to instead display the data from my model/ DB as {{ values|safe }} in pie chart form, pulling the values from json dumps of my DB data.

Here's what I've tried, as seen in my views.py file:

def metrics(request):
    pietitle = serializers.serialize('json', PieChart.objects.all(),fields=('title'))
    piestats = serializers.serialize('json', PieChart.objects.all(),fields=('stats'))
    piedata=[[pietitle, piestats]]
    json_data = json.dumps(piedata) 
    data_json= json.loads(json_data)
    return render(request, "metrics.html", {"values": data_json})

On my HTML page, the message I'm getting is simply "No Data", and I'm fairly certain that's because when I serialize the stats field, it's converted to a string and is unable to be interpreted as integers.

Would anyone kindly be able to assist? Thanks so much, in advance.

Answer 1

Make sure the data is in the correct format for the pie chart.

With this line piedata=[[pietitle, piestats]] , if you wanted to access the first title you'd have to go data_json[0][0][0] and for the first lot of stats you'll have to go data_json[0][1][0]

Edit:

If this is the correct format, it is possible you are using the wrong datatype for the PieChart model. When converting to JSON integers don't get converted to strings.