Django equivalent for latest entry for each user

Django equivalent for latest entry for each user

By : Rafael Pereira
Date : November 22 2020, 07:01 PM
will help you Using order_by and distinct:
code :

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Extract latest entry from a model in Django

Extract latest entry from a model in Django

By : user3118105
Date : March 29 2020, 07:55 AM
With these it helps Let's say I have the following Django model: , Try this:
code :
SQL query to combine two user tables, remove duplcates and find the latest update entry for each user

SQL query to combine two user tables, remove duplcates and find the latest update entry for each user

By : Jingyu Zhao
Date : March 29 2020, 07:55 AM
this will help I have two SQL tables. TableA has a list of active users, TableB has a list of all help tickets the users submitted with emails and submit dates.
code :
SELECT  A.eUserName,
INNER JOIN (SELECT txtContactEmail, MAX(SubmitDate) MaxSubmitDate
            FROM TableB
            GROUP BY txtContactEmail) AS B
    ON A.eEmailAddress = B.txtContactEmail
Django Get Latest Entry from Database

Django Get Latest Entry from Database

By : Jordann Pruitt
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You have two different questions here:
How do I retrieve the latest object from the database.
code :
Status.objects.latest('date_added') # or date_updated
# note the [] around the query
result = [Status.object.latest('date_added')]
Get latest entry in django in multiple dimensions

Get latest entry in django in multiple dimensions

By : parth
Date : March 29 2020, 07:55 AM
it fixes the issue I have a Django model that looks something like this: , This should do it in one go at the database (tested with PostGreSQL):
code :
MyModel.objects.order_by('field_1__pk', 'field_2__pk', 'field_3__pk', '-time_stamp')
.distinct('field_1__pk', 'field_2__pk', 'field_3__pk')
Django 1.8: Join latest entry to foreign key

Django 1.8: Join latest entry to foreign key

By : EKW
Date : March 29 2020, 07:55 AM
I wish this help you I was able to solve this by explicitly defining the prefetch queryset to get just the latest book for each author. This lets me use .all() which will only contain the latest book (or none), and doesn't cause another query.
code :
latest_books = Book.objects.annotate(latest=Max('author__book__pubdate')).filter(pubdate=F('latest'))

for a in Author.objects.prefetch_related(Prefetch('book_set', queryset=b_query)):
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