Django
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Nov 19, 2019 · 3. Make sure you installed Django in the virtualenv you are currently using. Also make sure you added the django-admin.py file to your Python PATH. If you want to start your project now and reinstall and fix the PATHs later, you can do: <path_to_django-admin.py> startproject <project_name>. # An example.
Feb 22, 2017 · The Django issue tracker has the remarkable entry #5763, titled "Queryset doesn't have a "not equal" filter operator". It is remarkable because (as of April 2016) it was "opened 9 years ago" (in the Django stone age), "closed 4 years ago", and "last changed 5 months ago". Read through the discussion, it is interesting.
Jun 24, 2011 · The suggested commands show your installed django version, not the code version. Check the requirements.txt cat src/requirements.txt | grep "Django==" or in your application's settings.py file, on the fifth line you'll see something like Generated by 'django-admin startproject' using Django x.x.x (for the user-specific question, the accepted answers are the way, but I found that this could also be useful).
class Dude(models.Model): # 1 dude can have 0+ phone numbers. numbers = models.OneToManyField('PhoneNumber') class PhoneNumber(models.Model): number = models.CharField() In this case, each Dude can have multiple PhoneNumber s, but the relationship should be unidirectional, in that I don't need to know from the PhoneNumber which Dude owns it ...
from django.db.models import Q criterion1 = Q(question__contains="software") criterion2 = Q(question__contains="java") q = Question.objects.filter(criterion1 & criterion2) Note the other answers here are simpler and better adapted for your use case, but if anyone with a similar but slightly more complex problem (such as needing "not" or "or") sees this, it's good to have the reference right here.
for erase database data follow this: if you use sqllite the only thing that you have to do is that remove .sqllite3 for migration use this command : python manage.py makemigrations <appname> python manage.py migrate <appname> and if migrate command not work, use this instead: python manage.py migrate --fake
May 23, 2009 · STATIC_URL = '/static/'. This tells Django where to find all the static files. MEDIA_URL = '/media/'. This points Django to the folder where your images are, after it loads static. In this case it is /media/ because our images are in /static/media. next, you should put this in the individual template where you need the image (I thought putting ...
from django.core import serializers from django.http import HttpResponse def your_view(request): data = serializers.serialize('json', YourModel.objects.all()) return HttpResponse(data, content_type='application/json') Bonus for Vue Users. If you want to bring your Django Queryset into Vue, you can do the following. template.html
9. One lighter alternative is pycha. See this blogpost to get an idea: A quick post on using Python Charts to generate nice SVG charts for your django website. Another option is to include google charts in your templates. If rendering the graph via js in your templates is an option, these are two popular libraries:
Apr 16, 2019 · do 'from django.db import connection' and use 'connection.queries'. This requires DEBUG=True. BTW, you should know that QuerySets are lazy and this hits the DB just once.
