Tastypie - 通過相關pk篩選

Question

我想通過相關字段pk篩選資源。

例如，我有國家PK，我想從該國獲得所有城市。我怎麼能這樣做？

class CityResource(ModelResource): 
    class Meta: 
     queryset = City.objects.all() 
     resource_name = 'city' 
     fields = ['name','id'] 

     filtering = { 
      #Something here 
     } 

class CountryResource(ModelResource): 
    class Meta: 
     queryset = Country.objects.all() 
     resource_name = 'country' 
     fields = ['name','code2','id'] 

而且一個例子網址：

http://startuprepublik.pre.is/api/v1/city/?format=json&country__pk=4 

任何想法？

Answer 1

from tastypie.fields import ForeignKey 
from tastypie.resources import ALL_WITH_RELATIONS 

class CityResource(ModelResource): 
    country = ForeignKey("path.to.api.CountryResource", "country") 

    class Meta: 
     queryset = City.objects.all() 
     resource_name = 'city' 
     fields = ['name','id'] 

     filtering = { 
      "country": ALL_WITH_RELATIONS 
     } 

class CountryResource(ModelResource): 
    class Meta: 
     queryset = Country.objects.all() 
     resource_name = 'country' 
     fields = ['name','code2','id'] 
     filtering = { "id": ALL }