问题
I am trying to get the latest Django model object but cannot seem to succeed.
Neither of these are working:
obj = Model.objects.filter(testfield=12).latest()
obj = Model.objects.latest().filter(testfield=12)
回答1:
obj= Model.objects.filter(testfield=12).order_by('-id')[0]
回答2:
See the docs from django: https://docs.djangoproject.com/en/dev/ref/models/querysets/#latest
You need to specify a field in latest(). eg.
obj= Model.objects.filter(testfield=12).latest('testfield')
Or if your model’s Meta specifies get_latest_by, you can leave off the field_name argument to earliest() or latest(). Django will use the field specified in get_latest_by by default.
回答3:
latest is really designed to work with date fields (it probably does work with other total-ordered types too, but not sure). And the only way you can use it without specifying the field name is by setting the get_latest_by meta attribute, as mentioned here.
回答4:
last() latest()
Usign last():
ModelName.objects.last()
using latest():
ModelName.objects.latest('id')
回答5:
obj= Model.objects.filter(testfield=12).order_by('-id')[:1] is the right solution
来源：https://stackoverflow.com/questions/15675672/get-the-latest-record-with-filter-in-django