Hey everyone,
I'm' working on a basic chained select menu that lets you drill down
from county to town to restaurant. The men is populated dynamically
using ajax calls from browser to Django on the server side.
It's working as intended, but I'm wondering if there is a "best
practice" or convention for returning JSON from Django. My initial
Django view built up a JSON response by looping over the results of a
database query. A friend who uses a different language/framework then
advised that I should avoid building my own JSON responses and
instead rely (whenever possible) on JSON libraries or serializers. He
said that provides better assurance you'll be sending properly
formatted JSON back to the browser.
Snippets from both implementations are below, and each worked for my
simple use-case.
So I'm wondering -- other than the issue raised above, is there a
preferred method for generating JSON?
Perhaps based on concerns about speed, efficiency or some other
factor? Any advice is appreciated.
--------------------JSON response built with
"manually"-----------------
def ajax_parser(request):
<<snip>>
county = request.GET['param']
towns = Town.objects.filter(county=county)
townList = [ ]
for town in towns:
options = { }
options['name'] = "%s" % (town)
options['value'] = town.id
townList.append(options)
<<snip>>
-------------------------------------JSON response using
serializer---------------------------
def ajax_parser(request):
<snip>>
if xhr:
try:
search = request.GET['search']
if search == 'county':
#client sends county integer for Town lookup
county = request.GET['param']
#generate JSON response for client - primary key
becomes Option value and municipality becomes Option text/name
data = serializers.serialize("json",
Town.objects.filter(county=county), fields=('pk','municipality') )
elif search == 'muni':
#client sends muni primary key for Restaurant lookup
muni = request.GET['param']
data = serializers.serialize("json",
Restaurant.objects.filter(municipality=muni), fields=('pk','name') )
return HttpResponse(data, mimetype='application/json')
<<snip>>
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