Cannot create database after messing with squashmigrations - django

Question

I have run squashmigrations in Django and after a while I needed to delete the database and start from scratch (the problem also applies when downloading the repository from GitHub and trying to recreate the project). I get following error when running python manage.py makemigrations or python manage.py migrate:
(venv) meal_plan   main  python manage.py makemigrations
Traceback (most recent call last):
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/backends/utils.py", line 89, in _execute
return self.cursor.execute(sql, params)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/backends/sqlite3/base.py", line 357, in execute
return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: no such table: meal_plan_recipe
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/Users/enricobonardi/CODING/TESTING/meal_plan/manage.py", line 22, in <module>
main()
File "/Users/enricobonardi/CODING/TESTING/meal_plan/manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
utility.execute()
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 440, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/core/management/base.py", line 402, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/core/management/base.py", line 443, in execute
self.check()
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/core/management/base.py", line 475, in check
all_issues = checks.run_checks(
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/core/checks/registry.py", line 88, in run_checks
new_errors = check(app_configs=app_configs, databases=databases)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/core/checks/urls.py", line 42, in check_url_namespaces_unique
all_namespaces = _load_all_namespaces(resolver)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/core/checks/urls.py", line 61, in _load_all_namespaces
url_patterns = getattr(resolver, "url_patterns", [])
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/utils/functional.py", line 57, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/urls/resolvers.py", line 715, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/utils/functional.py", line 57, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/urls/resolvers.py", line 708, in urlconf_module
return import_module(self.urlconf_name)
File "/Users/enricobonardi/.pyenv/versions/3.10.7/lib/python3.10/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 883, in exec_module
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
File "/Users/enricobonardi/CODING/TESTING/meal_plan/config/urls.py", line 9, in <module>
path("", include("meal_plan.urls", namespace="mealplan")),
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/urls/conf.py", line 38, in include
urlconf_module = import_module(urlconf_module)
File "/Users/enricobonardi/.pyenv/versions/3.10.7/lib/python3.10/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 883, in exec_module
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
File "/Users/enricobonardi/CODING/TESTING/meal_plan/meal_plan/urls.py", line 5, in <module>
from . import views
File "/Users/enricobonardi/CODING/TESTING/meal_plan/meal_plan/views.py", line 11, in <module>
from .forms import MealPlanForm, RecipeSimpleForm
File "/Users/enricobonardi/CODING/TESTING/meal_plan/meal_plan/forms.py", line 26, in <module>
class RecipeSimpleForm(forms.ModelForm):
File "/Users/enricobonardi/CODING/TESTING/meal_plan/meal_plan/forms.py", line 38, in RecipeSimpleForm
RECIPES = [(x.id, x.title) for x in Recipe.objects.all()]
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/models/query.py", line 394, in __iter__
self._fetch_all()
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/models/query.py", line 1866, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/models/query.py", line 87, in __iter__
results = compiler.execute_sql(
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/models/sql/compiler.py", line 1398, in execute_sql
cursor.execute(sql, params)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/backends/utils.py", line 103, in execute
return super().execute(sql, params)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/backends/utils.py", line 67, in execute
return self._execute_with_wrappers(
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/backends/utils.py", line 80, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/backends/utils.py", line 84, in _execute
with self.db.wrap_database_errors:
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/utils.py", line 91, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/backends/utils.py", line 89, in _execute
return self.cursor.execute(sql, params)
File "/Users/enricobonardi/CODING/TESTING/meal_plan/venv/lib/python3.10/site-packages/django/db/backends/sqlite3/base.py", line 357, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: no such table: meal_plan_recipe
(venv) ✘  meal_plan   main 
meal_plan/models.py:
from django.conf import settings
from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.urls import reverse
User = settings.AUTH_USER_MODEL
# ---------Stagionality----------#
class Month(models.Model):
name = models.CharField(max_length=25)
class Meta:
ordering = ("id",)
verbose_name = "mese"
verbose_name_plural = "mesi"
def __str__(self):
return self.name
class VegetableItem(models.Model):
class Types(models.IntegerChoices):
VERDURA = 1
FRUTTA = 2
name = models.CharField(max_length=100)
type = models.SmallIntegerField(choices=Types.choices, default=Types.VERDURA)
description = models.TextField(blank=True)
seasonality = models.ManyToManyField(Month, verbose_name="stagionalità")
image = models.ImageField(upload_to="vegetableitems", default="vegetableitems/default.png")
class Meta:
verbose_name = "alimento stagionale"
verbose_name_plural = "alimenti stagionali"
def __str__(self):
return self.name
# ---------END of Stagionality----------#
# ---------MealPlan----------#
class Day(models.TextChoices):
LUNEDI = "LUN", "Lunedì"
MARTEDI = "MAR", "Martedì"
MERCOLEDI = "MER", "Mercoledì"
GIOVEDI = "GIO", "Giovedì"
VENERDI = "VEN", "Venerdì"
SABATO = "SAB", "Sabato"
DOMENICA = "DOM", "Domenica"
class Type(models.IntegerChoices):
COLAZIONE = 1
SPUNTINO = 2
PRANZO = 3
MERENDA = 4
CENA = 5
class MealPlan(models.Model):
title = models.CharField(max_length=100)
user = models.ForeignKey(User, on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
def __str__(self) -> str:
return self.title
class Meta:
verbose_name_plural = "mealplan"
def get_absolute_url(self):
return reverse("mealplan:mealplan_detail", kwargs={"pk": self.pk})
class Meal(models.Model):
day = models.CharField(max_length=3, choices=Day.choices, default=Day.LUNEDI, verbose_name="giorno")
type = models.IntegerField(choices=Type.choices)
mealplan = models.ForeignKey(MealPlan, on_delete=models.CASCADE)
class Meta:
verbose_name = "pasto"
verbose_name_plural = "pasti"
def __str__(self) -> str:
return f"{self.mealplan} ({self.get_day_display()} - {self.get_type_display()})"
class Measure(models.IntegerChoices):
ML = 1
G = 2
UNIT = 3
class Recipe(models.Model):
title = models.CharField(max_length=100)
method = models.TextField(blank=True)
meals = models.ManyToManyField(Meal)
class Meta:
verbose_name = "ricetta"
verbose_name_plural = "ricette"
def __str__(self) -> str:
return self.title
class Ingredient(models.Model):
name = models.CharField(max_length=100)
quantity = models.SmallIntegerField(blank=True)
measure = models.IntegerField(choices=Measure.choices, default=Measure.G)
recipe = models.ForeignKey(Recipe, on_delete=models.CASCADE, null=True)
#receiver(post_save, sender=MealPlan)
def mealplan_post_save_receiver(sender, instance, created, *args, **kwargs):
if created:
mealplan = instance
days_of_the_week = Meal._meta.get_field("day").choices
days = [label for label, day in days_of_the_week]
for day in days:
for type in range(1, 6):
meal = Meal.objects.create(mealplan=mealplan, day=day, type=type)
meal.save()
# ---------END of MealPlan----------#
I tried to reset migrations on original repository using these instructions with no luck.

Answer 1

Finally found the bug causing the migration error. It's not about the squashmigrations command but in forms.py
class RecipeSimpleForm(forms.ModelForm):
...
RECIPES = [(x.id, x.title) for x in Recipe.objects.all()]
title = forms.ChoiceField(widget=forms.Select, choices=RECIPES)
class Meta:
model = Recipe
fields = ["title"]
I think the problem is I'm calling Recipe.objects.all() before the DB was created.

Answer 2

Simply delete your all migration folders and re-migrate manually using below command:
python manage.py makemigrations appname
python manage.py sqlmigrate appname 0001
python manage.py migrate
And see if it solves your error