logo
down
shadow

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 :


Share : facebook icon twitter icon
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 :
Instrument.objects.all().annotate(max_date=models.Max("info__date"))
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,
        A.eEmailAddress,
        B.MaxSubmitDate
FROM TableA AS A
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
Status.objects.order_by('id')[0]
# 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')
.values('value')
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)):
    a.book_set.all()[0]
Related Posts Related Posts :
  • How do I run a unit test against the production database?
  • How to browse (no text editor) .rst files?
  • Filter Queryset in Django inlineformset_factory
  • IPN delivery failed. HTTP error code 403: Forbidden
  • integrating django-paypal
  • How to get my Django app in a real server?
  • Writing custom Django form fields and widgets
  • Django queryset to find a char value with filtered out spaces?
  • Django i18n: how to not translate the admin site?
  • apache virtual host to work with django
  • Using django-piston, how can I write out HTTP headers in the response?
  • Django: getting the list of related records for a list of objects
  • Edit/show Primary Key in Django Admin
  • Django Application
  • How do I list all available context variables?
  • Django and Secure iCalendar Feed
  • Syncing data between devel/live databases in Django
  • What custom themes are there for Django Admin?
  • ChoiceField or CharField in django form
  • Django and ImageField Question
  • Django crash without message
  • Django: do I need to do HttpResponseRedirect to render a simple string after a POST?
  • modelform "object not callable" error
  • AttributeError at has no attribute 'objects'
  • how to Validate Expire date is bigger than start date in Django Model Form
  • Removing items from celery_beat doesn't remove them from database schedule
  • Column field is not recognized/not defined
  • Product items is not iterable from models
  • How to restrict Django models from using certain foreign key values?
  • How to force redirect_uri to use HTTPS with python-social-app?
  • How to pass a variable from a template to a view in Django
  • NGINX 502 bad gateway gunicorn timeout
  • How to sum django model fields
  • django template styntex {% if p.category == "help" %} {% endif %} is not work
  • Signal/Method for every executed sql statement
  • how to convert Django 2.0 url() to path()
  • Queryset Django - according to parameters date in weight compartment
  • Sum of related objects across 2 FK to the same table, with conditions
  • The views didn't return an HttpResponse object. It returned None instead
  • send value from anchor tag to views
  • LDAP Authentication not working in Graphite
  • ERR_CONNECTION_REFUSED with Django and Vue.js bundle files
  • When trying set corsheaders in settings.py file
  • 400(Bad request) status code when making request with axios in reactjs
  • How to access a Postgres database from a python program without django or heroku
  • Django REST Framework: URLs without PK
  • Django - query filter on manytomany is exists
  • SQLite objects created in a thread can only be used in that same thread with Django 2.2.2 and ipdb
  • Django: AttributeError: type object 'GroupModel' has no attribute '_meta'
  • how to display a html file stored in s3 in aws in my django template?
  • Django (admin.e104) must inherit from 'InlineModelAdmin'
  • populate table with initial data
  • How can I capture errors and exceptions data from frontend response to django to add more context
  • Django generate group by different than id
  • Django Running Particular Test
  • How do I display output of a python within Html in django?
  • get checkbox items list from table in django without using django-forms
  • Wagtail PASSWORD_REQUIRED_TEMPLATE is not overriding the default login
  • Django Admin - Upload multiple images to multiple model objects in a single upload
  • FOREIGN KEY constraint failed because of models.DO_NOTHING
  • shadow
    Privacy Policy - Terms - Contact Us © 35dp-dentalpractice.co.uk