There are a bunch of ways to do it, but the most straightforward is to simply use the Python debugger. Just add following line in to a Django view function: import pdb; pdb.set_trace() or breakpoint() #from Python3.7 If you try to load that page in your browser, the browser will hang and you get a … Read more
This is the behaviour to adopt when the referenced object is deleted. It is not specific to Django; this is an SQL standard. Although Django has its own implementation on top of SQL. (1) There are seven possible actions to take when such event occurs: CASCADE: When the referenced object is deleted, also delete the … Read more
You can revert by migrating to the previous migration. For example, if your last two migrations are: 0010_previous_migration 0011_migration_to_revert Then you would do: ./manage.py migrate my_app 0010_previous_migration You don’t actually need to use the full migration name, the number is enough, i.e. ./manage.py migrate my_app 0010 You can then delete migration 0011_migration_to_revert. If you’re using … Read more
Django 1.5 supports Python 2.6.5 and later. If you’re under Linux and want to check the Python version you’re using, run python -V from the command line. If you want to check the Django version, open a Python console and type >>> import django >>> django.VERSION (2, 0, 0, ‘final’, 0)
A “slug” is a way of generating a valid URL, generally using data already obtained. For instance, a slug uses the title of an article to generate a URL. I advise to generate the slug by means of a function, given the title (or another piece of data), rather than setting it manually. An example: … Read more
Phew, Django documentation really does not have good example about this. I spent over 2 hours to dig up all the pieces to understand how this works. With that knowledge I implemented a project that makes possible to upload files and show them as list. To download source for the project, visit https://github.com/axelpale/minimal-django-file-upload-example or clone … Read more
Try DISABLE KEYS or SET FOREIGN_KEY_CHECKS=0; Make sure to SET FOREIGN_KEY_CHECKS=1; after.
Concatenating the querysets into a list is the simplest approach. If the database will be hit for all querysets anyway (e.g. because the result needs to be sorted), this won’t add further cost. from itertools import chain result_list = list(chain(page_list, article_list, post_list)) Using itertools.chain is faster than looping each list and appending elements one by … Read more
You can use Q objects for this. They can be negated with the ~ operator and combined much like normal Python expressions: from myapp.models import Entry from django.db.models import Q Entry.objects.filter(~Q(id=3)) will return all entries except the one(s) with 3 as their ID: [<Entry: Entry object>, <Entry: Entry object>, <Entry: Entry object>, …]
You can list all the available timezones with pytz.all_timezones: In [40]: import pytz In [41]: pytz.all_timezones Out[42]: [‘Africa/Abidjan’, ‘Africa/Accra’, ‘Africa/Addis_Ababa’, …] There is also pytz.common_timezones: In [45]: len(pytz.common_timezones) Out[45]: 403 In [46]: len(pytz.all_timezones) Out[46]: 563