Django TastyPie Geo距离查找 [英] Django TastyPie Geo Distance Lookups

问题描述

我正在使用TastyPie进行地理距离查找。这有点困难，因为它不是由TastyPie支持。在Github上（https://gist.github.com/1067176）我发现了以下代码示例：

I'm using TastyPie for Geo-distance lookups. That is a bit difficult, because oficially its not supported by TastyPie. On Github (https://gist.github.com/1067176) I found the following code-sample:

 def apply_sorting(self, objects, options=None):
     if options and "longitude" in options and "latitude" in options:
         return objects.distance(Point(float(options['latitude']), float(options['longitude']))).order_by('distance')

     return super(UserLocationResource, self).apply_sorting(objects, options)

效果很好，但现在我想把这个距离作为TastyPie的一个字段结果。你有什么想法吗？只需在fields属性中包含distance即可。

It works well, but now I would like to have the distance as a field result in TastyPie. Do you have any idea how to do that? Just including "distance" in the fields attribute doesn't work.

提前感谢您的帮助！

推荐答案

元属性中定义的字段不足以返回附加值。
他们需要在资源中定义为额外的字段：

The fields defined in the meta attributes aren't enough to have the additional values returned. They need to be defined as additional fields in the resource:

distance = fields.CharField(attribute="distance", default=0, readonly=True)

可以通过定义 dehydrate_distance 资源中的方法

This value can be filled by defining dehydrate_distance method inside the resource

def dehydrate_distance(self, bundle):
    # your code here

或通过在资源元素中添加一些额外的元素，像这样：

or by adding some additional elements to queryset in resources meta like so:

queryset = YourModel.objects.extra(select={'distance': 'SELECT foo FROM bar'})

Tastypie本身附加一个名为resource_uri的字段，实际上并不存在于查询器中，查看tastypie资源的源代码可能是对您也有帮助。

Tastypie itself appends a field called resource_uri that isn't actually present in the queryset, looking at the source code of tastypie's resources might be helpful for you too.

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