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from django.http import Http404, JsonResponse
from django.views.generic.list import BaseListView
class AutocompleteJsonView(BaseListView):
"""Handle AutocompleteWidget's AJAX requests for data."""
paginate_by = 20
model_admin = None
def get(self, request, *args, **kwargs):
"""
Return a JsonResponse with search results of the form:
{
results: [{id: "123" text: "foo"}],
pagination: {more: true}
}
"""
if not self.model_admin.get_search_fields(request):
raise Http404(
'%s must have search_fields for the autocomplete_view.' %
type(self.model_admin).__name__
)
if not self.has_perm(request):
return JsonResponse({'error': '403 Forbidden'}, status=403)
self.term = request.GET.get('term', '')
self.paginator_class = self.model_admin.paginator
self.object_list = self.get_queryset()
context = self.get_context_data()
return JsonResponse({
'results': [
{'id': str(obj.pk), 'text': str(obj)}
for obj in context['object_list']
],
'pagination': {'more': context['page_obj'].has_next()},
})
def get_paginator(self, *args, **kwargs):
"""Use the ModelAdmin's paginator."""
return self.model_admin.get_paginator(self.request, *args, **kwargs)
def get_queryset(self):
"""Return queryset based on ModelAdmin.get_search_results()."""
qs = self.model_admin.get_queryset(self.request)
qs, search_use_distinct = self.model_admin.get_search_results(self.request, qs, self.term)
if search_use_distinct:
qs = qs.distinct()
return qs
def has_perm(self, request, obj=None):
"""Check if user has permission to access the related model."""
return self.model_admin.has_view_permission(request, obj=obj)
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