Django programming: cannot cast time without time zone to timestamp - django

Question

I am newbie to django and was using SQLite during development, when i moved to postgres when trying to deploy to production i get the below error
Cannot cast type time without time zone to timestamp with time zone
settings.py
Django settings for todoBackend 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/
"""
from pathlib import Path
from django.core.management.utils import get_random_secret_key
import os
import sys
import dj_database_url
# 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 = os.getenv("DJANGO_SECRET_KEY", get_random_secret_key())
# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = os.getenv("DEBUG", "False") == "True"
ALLOWED_HOSTS = os.getenv("DJANGO_ALLOWED_HOSTS", "127.0.0.1,localhost").split(",")
# Application definition
INSTALLED_APPS = [
"rest_framework",
"corsheaders",
"api.apps.ApiConfig",
"django.contrib.admin",
"django.contrib.auth",
"django.contrib.contenttypes",
"django.contrib.sessions",
"django.contrib.messages",
"django.contrib.staticfiles",
]
MIDDLEWARE = [
"corsheaders.middleware.CorsMiddleware",
"django.middleware.common.CommonMiddleware",
"django.middleware.security.SecurityMiddleware",
"django.contrib.sessions.middleware.SessionMiddleware",
"django.middleware.csrf.CsrfViewMiddleware",
"django.contrib.auth.middleware.AuthenticationMiddleware",
"django.contrib.messages.middleware.MessageMiddleware",
"django.middleware.clickjacking.XFrameOptionsMiddleware",
]
CORS_ALLOW_ALL_ORIGINS = True
ROOT_URLCONF = "todoBackend.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 = "todoBackend.wsgi.application"
# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases
DEVELOPMENT_MODE = os.getenv("DEVELOPMENT_MODE", "False") == "True"
# DEVELOPMENT_MODE = True
if DEVELOPMENT_MODE is True:
DATABASES = {
"default": {
"ENGINE": "django.db.backends.sqlite3",
"NAME": os.path.join(BASE_DIR, "db.sqlite3"),
}
}
elif len(sys.argv) > 0 and sys.argv[1] != "collectstatic":
if os.getenv("DATABASE_URL", None) is None:
raise Exception("DATABASE_URL environment variable not defined")
DATABASES = {
"default": dj_database_url.parse(os.environ.get("DATABASE_URL")),
}
# 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 = "Asia/Kolkata"
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/"
STATIC_ROOT = os.path.join(BASE_DIR, "staticfiles")
# Default primary key field type
# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field
DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
models.py
from django.db import models
# Create your models here.
class Tasks(models.Model):
title = models.CharField(max_length=200, blank=False, null=False)
description = models.CharField(max_length=1000, blank=True)
start_time = models.DateTimeField(blank=True, null=True)
end_time = models.DateTimeField(blank=True, null=True)
duration = models.CharField(max_length=25, blank=True)
completed = models.BooleanField(default=False)
last_modified = models.DateTimeField(auto_now=True)
def __str__(self):
return self.title
I am not sure why i am getting the error, i did setup the timezone in settings.py
The above code was working perfectly with SQLite , It only throws the error in Postgres

Answer 1

As #Iain shelvington in the comments pointed out , I had a migration that converted the end_time field from Character field to Time Field, Hence i was getting this error
I reset all my migrations and created a single migration which resolved the issue