django - 将我自己的查询参数添加到 django admin

Question

我有一个使用纬度和经度字段作为位置的模型。我想要使​​用查询参数运行的查询之一是围绕特定半径进行搜索。我读取了查询集并覆盖它:

queryset = super().get_queryset(request)
if 'radius' in request.GET:
    queryset = queryset.in_distance(request.GET['radius'], fields=['location__latitude',location__longitude'], points=[lat, lon])
return queryset

当使用 /admin/dal/listing?radius=50 调用我的管理页面时，我会被重定向到管理员，而无需查询字符串。

跟踪Django的代码，发现了这个:

# At this point, all the parameters used by the various ListFilters
# have been removed from lookup_params, which now only contains other
# parameters passed via the query string. We now loop through the
# remaining parameters both to ensure that all the parameters are valid
# fields and to determine if at least one of them needs distinct(). If
# the lookup parameters aren't real fields, then bail out.
try:
    for key, value in lookup_params.items():
        lookup_params[key] = prepare_lookup_value(key, value)
        use_distinct = use_distinct or lookup_needs_distinct(self.lookup_opts, key)
    return filter_specs, bool(filter_specs), lookup_params, use_distinct
except FieldDoesNotExist as e:
    six.reraise(IncorrectLookupParameters, IncorrectLookupParameters(e), sys.exc_info()[2])

简而言之，因为查询字符串不是已知字段，django 会优雅地发生 panic 并重定向不过滤的管理页面。

我能做什么？

Answer 1

您应该从请求中弹出客户参数。试试这个:

def get_queryset(self, request):
    queryset = super().get_queryset(request)
    request.GET = request.GET.copy()
    radius = request.GET.pop('radius', None)
    if radius:
        queryset = queryset.in_distance(
            radius[0], fields=['location__latitude', 'location__longitude'],
            points=[lat, lon])
    return queryset