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You need to specify a field in latest(). eg. 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.
The filter() method is used to filter you search, and allows you to return only the rows that matches the search term.
To filter a Python Django query with a list of values, we can use the filter method with in . to search Blog entries with pk set to 1,4 or 7 by calling Blog. objects. filter with the pk_in argument set to [1, 4, 7] .
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.
obj= Model.objects.filter(testfield=12).order_by('-id')[0]
last() latest()
Usign last():
ModelName.objects.last()
using latest():
ModelName.objects.latest('id')
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.
obj= Model.objects.filter(testfield=12).order_by('-id')[:1] is the right solution
You can do comparison with this down here.
latest('created') is same as order_by('-created').first()
Please correct me if I am wrong
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