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import json
from django.http import HttpResponse
from django.utils.encoding import force_text
from ajax_select import registry
def ajax_lookup(request, channel):
"""Load the named lookup channel and lookup matching models.
GET or POST should contain 'term'
Returns:
HttpResponse - JSON: `[{pk: value: match: repr:}, ...]`
Raises:
PermissionDenied - depending on the LookupChannel's implementation of check_auth
"""
# it should come in as GET unless global $.ajaxSetup({type:"POST"}) has been set
# in which case we'll support POST
if request.method == "GET":
# we could also insist on an ajax request
if 'term' not in request.GET:
return HttpResponse('')
query = request.GET['term']
else:
if 'term' not in request.POST:
return HttpResponse('') # suspicious
query = request.POST['term']
lookup = registry.get(channel)
if hasattr(lookup, 'check_auth'):
lookup.check_auth(request)
if len(query) >= getattr(lookup, 'min_length', 1):
instances = lookup.get_query(query, request)
else:
instances = []
results = json.dumps([
{
'pk': force_text(getattr(item, 'pk', None)),
'value': lookup.get_result(item),
'match': lookup.format_match(item),
'repr': lookup.format_item_display(item)
} for item in instances
])
response = HttpResponse(results, content_type='application/json')
response['Cache-Control'] = 'max-age=0, must-revalidate, no-store, no-cache;'
return response
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