CODEWITHSUNDEEP
pythondjangodjango-modelsdjango-queryset
doniyor
doniyor

Reputation: 37876

Get the latest record with filter in Django

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)

Upvotes: 133

Views: 197635

Answers (7)

Cornel Ciobanu
Cornel Ciobanu

Reputation: 551

obj = Model.objects.filter(testfield=12).order_by('id').latest('id')
  1. Filter based on what field you need - in this case is testfield

Model.objects.filter(testfield=12)

  1. In order to get the latest record, first you need to sort the queryset. So that it knows to return the last record based on a criteria.

Now, order the results base on your primary key - most of the times the pk=id

Model.objects.filter(testfield=12).order_by('id')

https://docs.djangoproject.com/en/4.0/ref/models/querysets/#order-by

By default, results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model’s Meta. You can override this on a per-QuerySet basis by using the order_by method.

  1. After you have the queryset and you have sorted it. Get the latest based on the criteria you need - in this case is the id.

Model.objects.filter(testfield=12).order_by('id').latest('id')

Upvotes: 4

Nikhil Bhardwaj
Nikhil Bhardwaj

Reputation: 582

You can do comparison with this down here.

image

latest('created') is same as order_by('-created').first() Please correct me if I am wrong

Upvotes: 3

Subin Shrestha
Subin Shrestha

Reputation: 1232

last() latest()

Usign last():

ModelName.objects.last()

using latest():

ModelName.objects.latest('id')

Upvotes: 64

Thomas John
Thomas John

Reputation: 2188

obj= Model.objects.filter(testfield=12).order_by('-id')[:1] is the right solution

Upvotes: 7

user3345047
user3345047

Reputation:

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.

Upvotes: 165

catherine
catherine

Reputation: 22808

obj= Model.objects.filter(testfield=12).order_by('-id')[0]

Upvotes: 128

acjay
acjay

Reputation: 36521

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.

Upvotes: 21

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