Django Tastypie - 使用URL参数过滤ToManyField资源 [英] Django Tastypie - Filtering ToManyField resource with URL parameter
问题描述
我正在使用Tastypie为我的Django(v1.5)应用程序实现一个API。我想要能够过滤/限制父资源时获得的相关资源。
I am working on implementing an API for my Django (v1.5) application using Tastypie. I would like to be able to filter/limit the related resources I get when the parent resource.
以下是我的(简化版)模型:
Here are my (simplified) models:
# myapp/models.py
class User(models.Model):
number = models.IntegerField()
device_id = models.CharField(verbose_name="Device ID", max_length=255)
timezone = models.CharField(max_length=255, blank=True)
def data(self, limit=0):
result = Data.objects.filter(patient_id = self.id).order_by('-datetime').values('datetime', 'value')
if limit != 0:
result = result[:limit]
return result
class Data(models.Model):
user = models.ForeignKey(User)
datetime = models.DateTimeField()
value = models.IntegerField()
我的资源: / p>
My resources:
# api/resources.py
class DataResource(ModelResource):
class Meta:
queryset = Data.objects.all()
resource_name = 'cgm'
fields = ['value', 'datetime']
serializer = Serializer(formats=['json', 'xml'])
filtering = {
'datetime': ('gte', 'lte'),
}
include_resource_uri = False
def dehydrate(self, bundle):
bundle.data['timestamp'] = calendar.timegm(bundle.data['datetime'].utctimetuple())
return bundle
class UserResource(ModelResource):
data = fields.ToManyField(DataResource, attribute=lambda bundle: Data.objects.filter(patient_id=bundle.obj.id), full=True, related_name='data', null=True)
class Meta:
queryset = User.objects.all().order_by('number')
resource_name = 'user'
fields = ['number', 'timezone', 'device_id'],
serializer = Serializer(formats=['json', 'xml'])
filtering = {
'data': ALL_WITH_RELATIONS,
}
我想使用URL参数,可以使用 User 资源中的datetime过滤资源资源资源,例如: / p>
I would like to be able to filter the Data resources by 'datetime' inside the User resource using an URL parameter, e.g.:
127.0.0.1:8000/api/v1/user/1/?format=json&datetime__gte=2013-11-14%2012:00:00
或
127.0.0.1:8000/api/v1/user/1/?format=json&data__datetime__gte=2013-11-14%2012:00:00
获取用户的号码,时区,设备ID 和数据列表过滤了给定的日期时间。
to get the User's number, timezone, device id and Data list filtered with the given datetime.
我不想要查询资源资源分开进行过滤,我想将整个东西捆绑在用户资源中。
有没有办法使用框架实现应用于嵌套资源的过滤器?
I don't want to have to query the Data resources separately to filter them, I want the whole thing bundled within the User resource. Is there a way to implement a filter applied to the nested resource using the framework?
感谢您的时间,我会感谢任何建议! p>
Thanks for your time, I'll appreciate any suggestion!
推荐答案
您可以将属性
参数扩展到 data
字段具有全面的功能,并重新使用 DataResource
:
You can extend your attribute
argument you've passed to the data
field with a full-scale function and reuse the DataResource
:
def filter_data_items(bundle):
res = DataResource()
new_bundle = Bundle(request=bundle.request)
objs = res.obj_get_list(new_bundle)
return objs.filter(parent_id=bundle.obj.pk)
res.obj_get_list
处理根据 DataResource
定义的过滤器。您只需要在 parent_id
上过滤。
res.obj_get_list
handles building and applying filters as defined per your DataResource
. You just need to filter it futher on parent_id
.
参考。
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