django - 如何使用 Tastypie 按相关模型属性过滤 API 结果？

Question

鉴于以下 API 定义，我需要能够按产品别名过滤事件。

鉴于 Event 属于 Job 并且 Job 属于 Product 我不确定如何指定。

api.py：

class ProductResource(ModelResource):

    class Meta:
        queryset = Product.objects.all()
        resource_name = 'product'
        allowed_methods = ['get']
        excludes = ['created_at','updated_at']
        filtering = {
            'alias': ALL
        }

class EnvironmentResource(ModelResource):

    class Meta:
        queryset = Environment.objects.all()
        resource_name = 'environment'
        allowed_methods = ['get']
        excludes = ['created_at','updated_at']

class JobResource(ModelResource):

    product = fields.ForeignKey(ProductResource, 'product')

    class Meta:
        queryset = Job.objects.all()
        resource_name = 'job'
        allowed_methods = ['get']
        excludes = ['created_at','updated_at']

class EventResource(ModelResource):

    environment = fields.ForeignKey(EnvironmentResource, 'environment',full=True)
    job = fields.ForeignKey(JobResource, 'job',full=True)

    class Meta:
        queryset = Event.objects.all()
        resource_name = 'event'
        allowed_methods = ['get']
        excludes = ['created_at','updated_at']
        filtering = {
            HOW DO I FILTER BY PRODUCT ALIAS????
        }

Answer 1

给定以下过滤规格：

# In EventResource
filtering = { 
   'job' : ALL_WITH_RELATIONS
}

# In JobResource
filtering = { 
   'product' : ALL_WITH_RELATIONS
}

# In ProductResource
filtering = {
    'alias' : ALL
}

你应该能够做到：

/api/events/job__product__alias=something

Answer 2

实现此目的的一种简单方法是使用高级过滤。这避免了很多由tastepie ForeignKey 字段生成的查询。为安全起见，请记住在将数据添加到orm_filters.

class EventResource(ModelResource):

    class Meta:
        queryset = Event.objects.all()
        resource_name = 'event'
        allowed_methods = ['get']

    def build_filters(self, filters=None):

        if filters is None:
            filters = {}

        orm_filters = super(EventResource, self).build_filters(filters)

        # Your filtering
        if 'job__product__alias' in filters:
            orm_filters['job__product__alias'] = filters.get(
                'job__product__alias')

    return orm_filters

他们应该能够得到过滤后的结果：

/api/events/?job__product__alias=something