How to filter an object based on a DateTimeField range in Python (Django) using Tastypie

问题

How can one filter an object based on a datetime field range using Tastypie.

I have a Post model:

class Post(models.Model):
     title = models.CharField(max_length=40)
     postTime = models.DateTimeField(auto_now_add=True)
     description = models.CharField(max_length=140)

The post objects are retrieved through Tastypie. The range of objects I would like to retrieve are all the objects created from today to all the objects created 3 days ago. So I tried filtering the objects from the queryset as follows

RecentPosts(ModelResource):
     class Meta:
          queryset= Post.objects.filter(postTime__range=(date.today(), date.today() -timedelta(days=3)))
          resource_name = 'recent-posts'
          fields = ['id','postTime']
          authentication = BasicAuthentication()
          authorization =DjangoAuthorization()
          serializer = Serializer(formats=['json'])
          include_resource_uri = False
          filtering = {
                            'postTime': ALL,
                            'description': ALL,
          }

Even after doing this I'm unable to retrieve the objects. How else can I go about this?

回答1:

Have you tried to use

filtering = {
   "postTime": ['gte', 'lte'],
}

and then in the query which is calling the resource add

http://your.query/?postTime__lte=<SOME DATE>&postTime__gte=<SOME DATE>

You can also choose

filtering = {
   "postTime": ['gte',],
}

filtering = {
   "postTime": ['lte',],
}

with a proper query.

回答2:

After spending hours fiddling with different solutions, I finally found one that works. What I did was, instead of doing the filtering from the queryset I did the filtering in object_get_list Here is my solution. Also make sure you have the proper imports as well

 from datetime import datetime, timedelta

 RecentPosts(ModelResource):
 class Meta:
      queryset= Post.objects.all()
      resource_name = 'recent-posts'
      fields = ['id','postTime']
      authentication = BasicAuthentication()
      authorization =DjangoAuthorization()
      serializer = Serializer(formats=['json'])
      include_resource_uri = False
      filtering = {
                        'postTime': ALL,
                        'description': ALL,
      }
 get_object_list(self, request):
      return super(RecentPosts, self).get_object_list.filter(postTime__range=(datetime.now() - timedelta(days=3), datetime.now()))

This will return all objects created from the current date to all the objects from 3 days ago. Try this solution out and let me know if it works for you.

回答3:

I had a case where I needed this to be handled in query itself. Basically I wanted to use range in the query. I couldn't find any answer. I have done it in the following way. Might help someone:

filtering = {
  "postTime": ['range']
}

Query using:

http://your.query/?postTime__range=<SOME DATE>,<SOME DATE>

Returns all the records between these two days!

来源：https://stackoverflow.com/questions/15487537/how-to-filter-an-object-based-on-a-datetimefield-range-in-python-django-using

标签

python

django

datetime

filtering

tastypie