django.db.utils.ProgrammingError: relation does not exist LINE 1 - django

Question

I encountered an issue while migrating a DB using django:
Traceback (most recent call last): File
"C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 84, in _execute
return self.cursor.execute(sql, params) psycopg2.errors.UndefinedTable: relation "myBlog_category" does not
exist LINE 1: ...g_category"."name", "myBlog_category"."name" FROM
"myBlog_ca...
^
The above exception was the direct cause of the following exception:
Traceback (most recent call last): File "manage.py", line 22, in
main() File "manage.py", line 18, in main
execute_from_command_line(sys.argv) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management_init_.py",
line 401, in execute_from_command_line
utility.execute() File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management_init_.py",
line 395, in execute
self.fetch_command(subcommand).run_from_argv(self.argv) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py",
line 330, in run_from_argv
self.execute(*args, **cmd_options) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py",
line 368, in execute
self.check() File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py",
line 392, in check
all_issues = checks.run_checks( File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\checks\registry.py",
line 70, in run_checks
new_errors = check(app_configs=app_configs, databases=databases) File
"C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\checks\urls.py",
line 13, in check_url_config
return check_resolver(resolver) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\checks\urls.py",
line 23, in check_resolver
return check_method() File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\resolvers.py",
line 408, in check
for pattern in self.url_patterns: File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\utils\functional.py",
line 48, in get
res = instance.dict[self.name] = self.func(instance) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\resolvers.py",
line 589, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module) File
"C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\utils\functional.py",
line 48, in get
res = instance.dict[self.name] = self.func(instance) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\resolvers.py",
line 582, in urlconf_module
return import_module(self.urlconf_name) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\importlib_init_.py",
line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level) File "", line 1014, in _gcd_import File
"", line 991, in _find_and_load File
"", line 975, in _find_and_load_unlocked
File "", line 671, in _load_unlocked
File "", line 783, in
exec_module File "", line 219, in
call_with_frames_removed File "C:\Users\rroct\Desktop\blog_Py_PostSQL\blog\blog\urls.py", line 8, in
path('', include('myBlog.urls')), File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\conf.py",
line 34, in include
urlconf_module = import_module(urlconf_module) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\importlib_init.py",
line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level) File "", line 1014, in _gcd_import File
"", line 991, in _find_and_load File
"", line 975, in _find_and_load_unlocked
File "", line 671, in _load_unlocked
File "", line 783, in
exec_module File "", line 219, in
_call_with_frames_removed File "C:\Users\rroct\Desktop\blog_Py_PostSQL\blog\myBlog\urls.py", line 2,
in
from .views import HomeView, ArticleDetailView, AddPostView, UpdatePostView, DeletePostView, AddCategoryView, CategoryView,
CategoryListView, LikeView, AddCommentView File
"C:\Users\rroct\Desktop\blog_Py_PostSQL\blog\myBlog\views.py", line 4,
in
from .forms import PostForm, EditForm, CommentForm File "C:\Users\rroct\Desktop\blog_Py_PostSQL\blog\myBlog\forms.py", line 6,
in
for item in choices: File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\query.py",
line 287, in iter
self._fetch_all() File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\query.py",
line 1303, in _fetch_all
self._result_cache = list(self._iterable_class(self)) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\query.py",
line 142, in iter
return compiler.results_iter(tuple_expected=True, chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size) File
"C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\sql\compiler.py",
line 1108, in results_iter
results = self.execute_sql(MULTI, chunked_fetch=chunked_fetch, chunk_size=chunk_size) File
"C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\sql\compiler.py",
line 1156, in execute_sql
cursor.execute(sql, params) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 98, in execute
return super().execute(sql, params) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 66, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute) File
"C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 75, in _execute_with_wrappers
return executor(sql, params, many, context) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 84, in _execute
return self.cursor.execute(sql, params) File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\utils.py",
line 90, in exit
raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 84, in _execute
return self.cursor.execute(sql, params) django.db.utils.ProgrammingError: relation "myBlog_category" does not
exist LINE 1: ...g_category"."name", "myBlog_category"."name" FROM
"myBlog_ca...
I deployed the app to heroku and got errors so I tried to change the sqlite db to psql before commiting it to heroku but after doing this tutorial migrations did not work anymore, I got stuck on the 3rd step of the tutorial.
I tried the following:
Delete migrations folder from myBlog
Delete db.sqlite3 file
After removing the files/folders above I tried python manage.py makemigrations and got the following error:
Traceback (most recent call last):
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 84, in _execute
return self.cursor.execute(sql, params)
psycopg2.errors.UndefinedTable: relation "myBlog_category" does not exist
LINE 1: ...g_category"."name", "myBlog_category"."name" FROM "myBlog_ca...
^
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 22, in <module>
main()
File "manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\__init__.py",
line 401, in execute_from_command_line
utility.execute()
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management_init_.py",
line 395, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py",
line 330, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py",
line 368, in execute
self.check()
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py",
line 392, in check
all_issues = checks.run_checks(
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\checks\registry.py",
line 70, in run_checks
new_errors = check(app_configs=app_configs, databases=databases)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\checks\urls.py",
line 13, in check_url_config
return check_resolver(resolver)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\checks\urls.py",
line 23, in check_resolver
return check_method()
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\resolvers.py",
line 408, in check
for pattern in self.url_patterns:
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\utils\functional.py",
line 48, in get
res = instance.dict[self.name] = self.func(instance)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\resolvers.py",
line 589, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\utils\functional.py",
line 48, in get
res = instance.dict[self.name] = self.func(instance)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\resolvers.py",
line 582, in urlconf_module
return import_module(self.urlconf_name)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\importlib_init_.py",
line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1014, in _gcd_import
File "", line 991, in _find_and_load
File "", line 975, in _find_and_load_unlocked
File "", line 671, in _load_unlocked
File "", line 783, in exec_module
File "", line 219, in call_with_frames_removed
File "C:\Users\rroct\Desktop\blog_Py_PostSQL\blog\blog\urls.py", line 8, in
path('', include('myBlog.urls')),
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\conf.py",
line 34, in include
urlconf_module = import_module(urlconf_module)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\importlib_init.py",
line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1014, in _gcd_import
File "", line 991, in _find_and_load
File "", line 975, in _find_and_load_unlocked
File "", line 671, in _load_unlocked
File "", line 783, in exec_module
File "", line 219, in _call_with_frames_removed
File "C:\Users\rroct\Desktop\blog_Py_PostSQL\blog\myBlog\urls.py", line 2,
in
from .views import HomeView, ArticleDetailView, AddPostView, UpdatePostView, DeletePostView, AddCategoryView, CategoryView,
CategoryListView, LikeView, AddCommentView
File "C:\Users\rroct\Desktop\blog_Py_PostSQL\blog\myBlog\views.py", line 4,
in
from .forms import PostForm, EditForm, CommentForm
File "C:\Users\rroct\Desktop\blog_Py_PostSQL\blog\myBlog\forms.py", line 6,
in
for item in choices:
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\query.py",
line 287, in iter
self._fetch_all()
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\query.py",
line 1303, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\query.py",
line 142, in iter
return compiler.results_iter(tuple_expected=True, chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\sql\compiler.py",
line 1108, in results_iter
results = self.execute_sql(MULTI, chunked_fetch=chunked_fetch, chunk_size=chunk_size)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\sql\compiler.py",
line 1156, in execute_sql
cursor.execute(sql, params)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 98, in execute
return super().execute(sql, params)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 66, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 75, in _execute_with_wrappers
return executor(sql, params, many, context)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\utils.py",
line 90, in exit
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\rroct\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py",
line 84, in _execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: relation "myBlog_category" does not exist
LINE 1: ...g_category"."name", "myBlog_category"."name" FROM "myBlog_ca...
Trying to run the server locally now, doesn't work.
While deploying it to heroku I got ProgrammingError - something close to what I get now. I tried to run:
heroku run python manage.py migrate
But got the app would return me the same error as the same traceback at the begging of the post.
My settings.py file:
"""
Django settings for blog project.
Generated by 'django-admin startproject' using Django 3.2.5.
For more information on this file, see
https://docs.djangoproject.com/en/3.2/topics/settings/
For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.2/ref/settings/
"""
import os
import django_heroku
import dj_database_url
from decouple import config
from pathlib import Path
# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent
# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/
# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-97gr5qi*888x%%n!=yp(uf*xz!8(jucnfd!ln+_zkyg#8#e5th'
# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True
ALLOWED_HOSTS = []
# Application definition
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'myBlog',
'members',
'ckeditor',
]
MIDDLEWARE = [
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'whitenoise.middleware.WhiteNoiseMiddleware'
]
ROOT_URLCONF = 'blog.urls'
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
]
WSGI_APPLICATION = 'blog.wsgi.application'
# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases
DATABASES = {
'default': {
'ENGINE' : 'django.db.backends.postgresql_psycopg2',
'NAME' : 'my_db',
'USER' : 'hero',
'PASSWORD' : 'my_db # 123',
'HOST' : 'localhost',
'PORT' : '5432',
}
}
# Password validation
# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators
AUTH_PASSWORD_VALIDATORS = [
{
'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
},
]
# Internationalization
# https://docs.djangoproject.com/en/3.2/topics/i18n/
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'UTC'
USE_I18N = True
USE_L10N = True
USE_TZ = True
# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.2/howto/static-files/
STATIC_URL = '/static/'
MEDIA_URL = '/media/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
STATICFILES_DIRS = (
os.path.join(BASE_DIR, 'static'),
)
STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'
# Default primary key field type
# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field
DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
LOGIN_REDIRECT_URL = 'home'
LOGOUT_REDIRECT_URL = 'home'
django_heroku.settings(locals())
For any other additional required informations please let me know.
Edit 1:
My models.py
from ckeditor.fields import RichTextField
from django.contrib.auth.models import User
from django.db import models
from django.urls import reverse
class Category(models.Model):
name = models.CharField(max_length=255)
def __str__(self) :
return self.name
def get_absolute_url(self) :
return reverse('home')
class Profile(models.Model):
user = models.OneToOneField(User, null=True, on_delete=models.CASCADE)
bio = models.TextField()
profile_pic = models.ImageField(null=True, blank=True, upload_to="images/profile")
website_url = models.CharField(max_length=255, null=True, blank=True)
facebook_url = models.CharField(max_length=255, null=True, blank=True)
instagram_url = models.CharField(max_length=255, null=True, blank=True)
twitter_url = models.CharField(max_length=255, null=True, blank=True)
pinterest_url = models.CharField(max_length=255, null=True, blank=True)
def __str__(self):
return str(self.user)
def get_absolute_url(self) :
return reverse('home')
class Post(models.Model):
title = models.CharField(max_length=255)
header_image = models.ImageField(null=True, blank=True, upload_to="images/")
title_tag = models.CharField(max_length=255)
author = models.ForeignKey(User, on_delete=models.CASCADE)
body = RichTextField(blank=True, null=True)
post_date = models.DateField(auto_now_add=True)
category = models.CharField(max_length=255, default='uncategorized')
snippet = models.CharField(max_length=255)
likes = models.ManyToManyField(User, related_name='blog_posts')
def total_likes(self):
return self.likes.count()
def __str__(self):
return self.title + ' | ' + str(self.author)
# Create your models here.
def get_absolute_url(self):
return reverse('article-detail', args=(str(self.id),))
class Comment(models.Model):
post = models.ForeignKey(Post, related_name="comments", on_delete=models.CASCADE)
name = models.CharField(max_length=255)
body = models.TextField()
date_added = models.DateTimeField(auto_now_add=True)
def __str__(self):
return '%s - %s' % (self.post.title, self.name)
views.py for myBlog app:
from django.shortcuts import render, get_object_or_404
from django.views.generic import ListView, DetailView, CreateView, UpdateView, DeleteView
from .models import Post, Category, Comment
from .forms import PostForm, EditForm, CommentForm
from django.urls import reverse_lazy, reverse
from django.http import HttpResponseRedirect
from django.core.paginator import Paginator
# Create your views here.
def LikeView(request, pk):
post = Post.objects.get(id=pk)
liked = False
if post.likes.filter(id=request.user.id).exists():
post.likes.remove(request.user)
liked = False
else:
post.likes.add(request.user)
liked = True
return HttpResponseRedirect(reverse('article-detail', args=[str(pk)]))
class HomeView(ListView):
model = Post
template_name = 'home.html'
ordering = ['-post_date']
def get_context_data(self, *args, **kwargs):
cat_menu = Category.objects.all()
context = super(HomeView, self).get_context_data(*args, **kwargs)
context["cat_menu"] = cat_menu
return context
class ArticleDetailView(DetailView):
model = Post
template_name = 'article_details.html'
def get_context_data(self, *args, **kwargs):
cat_menu = Category.objects.all()
context = super(ArticleDetailView, self).get_context_data(*args, **kwargs)
stuff = get_object_or_404(Post, id=self.kwargs['pk'])
liked = False
if stuff.likes.filter(id=self.request.user.id).exists():
liked = True
total_likes = stuff.total_likes()
context["cat_menu"] = cat_menu
context["total_likes"] = total_likes
context["liked"] = liked
return context
class AddPostView(CreateView):
model = Post
form_class = PostForm
template_name = 'add_post.html'
def CategoryListView(request):
cat_menu_list = Category.objects.all()
return render(request, 'category_list.html', {'cat_menu_list': cat_menu_list})
def CategoryView(request, cats):
category_posts = Post.objects.filter(category=cats.title().replace('-', ' '))
return render(request, 'categories.html', {'cats': cats.title().replace('-', ' '), 'category_posts': category_posts})
class AddCategoryView(CreateView):
model = Category
fields = '__all__'
template_name = 'add_category.html'
class UpdatePostView(UpdateView):
model = Post
template_name = 'update_post.html'
form_class = EditForm
class DeletePostView(DeleteView):
model = Post
template_name = 'delete_post.html'
success_url = reverse_lazy('home')
class AddCommentView(CreateView):
model = Comment
form_class = CommentForm
template_name = 'add_comment.html'
def form_valid(self, form):
form.instance.post_id = self.kwargs['pk']
return super().form_valid(form)
success_url = reverse_lazy('home')

Answer 1

You shouldn't have deleted the migrations folder. Add this folder to your application and add the init file to it. Then create migrations locally. You have to create migrations locally. Heroku should not (and will not) create migration files. Heroku is just executing your code.
Also, if the data in the database is not important, you can re-create db to update the migration table. Or you can update it manually.
Steps
1. Creating a migration folder
cd ./your_app
mkdir migrations
cd migrations
touch __ini__.py
2. Creating migrations
./manage.py makemigrations
3. Pushing on heroku
4. Applying migrations
heroku run python manage.py migrate
P.S: I think Heroku has the tools to manage the Django app. Please refer to the documentation. I think applying migrations should be automatic.
You should performing steps 1-3 locally.
You can re-create the database on heroku or reset it. If you are re-creating the database, do not forget to change the access parameters in the project settings