Getting OperationalError in django - django

Question

When i am trying to access the Home page i am getting the following error
OperationalError at /
no such column: articles_article.author_id
models.py
from django.db import models
from django.contrib.auth.models import User
# Create your models here.
class Article(models.Model):
author = models.ForeignKey(User, default=None, on_delete=models.CASCADE)
title = models.CharField(max_length=50)
slug = models.SlugField()
body = models.TextField()
date = models.DateTimeField(auto_now_add=True)
thumbnail = models.ImageField(default='default.png', blank=True, upload_to='profile_pics')
def __str__(self):
return self.title
def __repr__(self):
return self.title
def snippet(self):
return self.body[:50]+'...'
def getslug(self):
return self.title.lower().replace(' ', '-')
djangonautic\views.py
from django.http import HttpResponse
from django.shortcuts import render
from django.apps import apps
def about(request):
return render(request, "about.html")
def home(request):
article_model = apps.get_model('articles', 'Article')
articles = article_model.objects.all()[0:3]
return render(request, "home.html", {'articles': articles})
articles\views.py
from django.shortcuts import render, redirect
from .models import Article
from .forms import ArticleForm
from django.utils import timezone
from django.contrib.auth.decorators import login_required
# Create your views here.
#login_required(login_url='users:login')
def article_list(request):
articles = Article.objects.all().order_by('date')
return render(request, "articles.html", {'articles': articles })
#login_required(login_url='login')
def article_details( request, slug, pk):
article = Article.objects.get(pk = pk)
return render(request, "article_details.html", {'article': article})
#login_required(login_url='login')
def create_article(request):
if request.method == 'POST':
form = ArticleForm(request.POST, request.FILES or None)
if form.is_valid():
article = form.save(commit=False)
article.date = timezone.now()
article.slug = Article.getslug(article)
article.author = request.user
article.save()
return redirect('articles:details', slug=article.slug, pk=article.pk)
else:
form = ArticleForm()
return render(request, 'create_article.html', {'form': form})
admins.py
from django.contrib import admin
from .models import Article
# Register your models here.
admin.site.register(Article)
I have run python manage.py makemigrations and python manage.py migrate commands but the issue still persists.
0001_initial.py
# Generated by Django 3.0.5 on 2020-05-10 18:33
from django.conf import settings
from django.db import migrations, models
import django.db.models.deletion
class Migration(migrations.Migration):
initial = True
dependencies = [
migrations.swappable_dependency(settings.AUTH_USER_MODEL),
]
operations = [
migrations.CreateModel(
name='Article',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('title', models.CharField(max_length=50)),
('slug', models.SlugField()),
('body', models.TextField()),
('date', models.DateTimeField(auto_now_add=True)),
('thumbnail', models.ImageField(blank=True, default='default.png', upload_to='profile_pics')),
('author', models.ForeignKey(default=None, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
],
),
]

Answer 1

you need to delete your previous migration files and again run
python manage.py makemigrations
python manage.py migrate
it seems you have added new column in existing table.

Answer 2

I guess i solved this issue. I deleted the previously added articles and then i deleted the db.sqlite3 file. Then i ran the migration again and it worked. Not sure if deleting the articles was the correct approach, but that was the only one i could think of.
Please let me know if there was any other way to resolve this error without having to delete the articles.