如何在Tastypie中加载外键元素 [英] How to load the foreign keys elements in Tastypie

问题描述

在我的Django模型中，我有10个字段，有3个字段是外键。
在从GET请求中收到的JSON数据中，我得到所有的字段，而不是外键。

In my Django model, I have 10 fields and there are 3 fields which are foreign keys. In my JSON data which is received from a GET request, I am getting all the fields but not the foreign keys.

我也做了这个，但是我还没有在JSON数据中获取这些字段：

I have also done this, but I am still not getting those fields in the JSON data:

DataFields = MyData._meta.get_all_field_names()
class MyResource(ModelResource):
       class Meta:
        queryset = MyData.objects.all()
        resource_name = 'Myres'
        serializer = Serializer(formats=['json'])
        filtering = dict(zip(DataFields, [ALL_WITH_RELATIONS for f in DataFields]))

例如，我在模型中有如 city 的字段，但该字段在我从中得到的JSON中是不可用的。

For example, I have the field in model like city, but that field is not available in the JSON I get from it.

有没有办法在JSON中可以自动获得 city：city__name

Is there any way that in JSON I can get city:city__name automatically?

如果我这个，然后我得到城市，但是我可以不做定义：

If I do this, then I get the city, but can I do that without defining:

def dehydrate(self, bundle):
        bundle.data["city_name"] = bundle.obj.city__name
        return bundle

推荐答案

您将要创建相关资源用于您的外键字段，并将其嵌入到 MyResource 中。如果您使嵌入式资源 full = True ，则在获取 MyResource 时会脱水，否则将嵌入它作为相关资源uri。

You'll want to create related resources for your foreign key fields and embed them in MyResource. If you make the embedded resource full=True, it'll dehydrate it when fetching MyResource, otherwise it'll embed it as the related resource uri.

class RelatedResource(ModelResource):
    class Meta:
        ...


class MyResource(ModelResource):
    related = fields.ForeignKey(RelatedResource, full=True)

    class Meta:
        ...

然后可以通过过滤？related__field = value 在GET请求中 MyResource 。

You can then filter by ?related__field=value in the GET request to MyResource.

如果您只想要模型的 __ unicode __ 返回的字段，则可以尝试执行以下操作（而不是嵌入相关资源）：

If you're just wanting the field returned by the model's __unicode__, you can try doing the following (rather than embedding a related resource):

class MyResource(ModelResource):    
    city = fields.CharField(attribute="city")

    class Meta:
        ...

其中city是t的字段名称他的外键是 MyData 模型。

Where "city" is the field name of the foreign key on the MyData model.

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