title: django.db.utils.ProgrammingError: column calculator_calculation._id does not exist using heroku and djongo
body: <p>My app works on my local machine but when deployed to heroku with the exact same code I get errors when using get requests to my API views involving any DB interaction. I have a feeling heroku is trying to use postgres for some reason, even though I do not have any code dealing with postgres in my code. Any help is appreciated, I have done migrations a million different ways with no luck, even though mongo shouldnt need migrations.</p>
  
  <p>Error and code below</p>
  
  <pre><code>2019-11-21T18:26:15.428986+00:00 app[web.1]: Traceback (most recent call last):
  2019-11-21T18:26:15.428989+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
  2019-11-21T18:26:15.428991+00:00 app[web.1]:     response = get_response(request)
  2019-11-21T18:26:15.428993+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
  2019-11-21T18:26:15.428995+00:00 app[web.1]:     response = self.process_exception_by_middleware(e, request)
  2019-11-21T18:26:15.428997+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
  2019-11-21T18:26:15.429000+00:00 app[web.1]:     response = wrapped_callback(request, *callback_args, **callback_kwargs)
  2019-11-21T18:26:15.429002+00:00 app[web.1]:   File "/app/calculator/views.py", line 22, in calculate
  2019-11-21T18:26:15.429004+00:00 app[web.1]:     print(calcs)
  2019-11-21T18:26:15.429006+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 250, in __repr__
  2019-11-21T18:26:15.429008+00:00 app[web.1]:     data = list(self[:REPR_OUTPUT_SIZE + 1])
  2019-11-21T18:26:15.429010+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 274, in __iter__
  2019-11-21T18:26:15.429012+00:00 app[web.1]:     self._fetch_all()
  2019-11-21T18:26:15.429014+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 1242, in _fetch_all
  2019-11-21T18:26:15.429016+00:00 app[web.1]:     self._result_cache = list(self._iterable_class(self))
  2019-11-21T18:26:15.429018+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 55, in __iter__
  2019-11-21T18:26:15.429020+00:00 app[web.1]:     results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
  2019-11-21T18:26:15.429022+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1100, in execute_sql
  2019-11-21T18:26:15.429024+00:00 app[web.1]:     cursor.execute(sql, params)
  2019-11-21T18:26:15.429026+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 99, in execute
  2019-11-21T18:26:15.429028+00:00 app[web.1]:     return super().execute(sql, params)
  2019-11-21T18:26:15.429030+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 67, in execute
  2019-11-21T18:26:15.429032+00:00 app[web.1]:     return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  2019-11-21T18:26:15.429034+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 76, in _execute_with_wrappers
  2019-11-21T18:26:15.429036+00:00 app[web.1]:     return executor(sql, params, many, context)
  2019-11-21T18:26:15.429038+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute
  2019-11-21T18:26:15.429040+00:00 app[web.1]:     return self.cursor.execute(sql, params)
  2019-11-21T18:26:15.429042+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
  2019-11-21T18:26:15.429044+00:00 app[web.1]:     raise dj_exc_value.with_traceback(traceback) from exc_value
  2019-11-21T18:26:15.429046+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute
  2019-11-21T18:26:15.429048+00:00 app[web.1]:     return self.cursor.execute(sql, params)
  2019-11-21T18:26:15.429050+00:00 app[web.1]: django.db.utils.ProgrammingError: column calculator_calculation._id does not exist
  2019-11-21T18:26:15.429052+00:00 app[web.1]: LINE 1: SELECT "calculator_calculation"."_id", "calculator_calculati...
  2019-11-21T18:26:15.429054+00:00 app[web.1]:                ^
  2019-11-21T18:26:15.429062+00:00 app[web.1]:
  </code></pre>
  
  <p>I have everything imported correctly and settings are correct as far as I know for my mongoDB</p>
  
  <pre><code>import os
  import environ
  import django_heroku
  
  
  
  env = os.environ
  
  # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
  BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
  
  
  
  SECRET_KEY = 'secret'
  
  # SECURITY WARNING: don't run with debug turned on in production!
  DEBUG = True
  
  ALLOWED_HOSTS = []
  
  STATICFILES_DIRS = (
  )
  # STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'
  STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')
  
  # Application definition
  
  INSTALLED_APPS = [
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'calculator.apps.CalculatorConfig'
  ]
  
  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',
  ]
  
  ROOT_URLCONF = 'sezzleCalculator.urls'
  
  TEMPLATES = [
      {
          'BACKEND': 'django.template.backends.django.DjangoTemplates',
          'DIRS': [os.path.join(BASE_DIR, 'templates')]
          ,
          '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 = 'sezzleCalculator.wsgi.application'
  
  
  # Database
  # https://docs.djangoproject.com/en/2.2/ref/settings/#databases
  
  DATABASES = {
      "default": {
          "ENGINE": "djongo",
          "NAME": "appDB",
          "HOST": "hostURL",
          "PASSWORD": "password",
          "USER": "randomuser",
          "AUTH_MECHANISM": 'SCRAM-SHA-1',
          "AUTH_SOURCE": "admin",
          "ENFORCE_SCHEMA": False,
      }
  }
  
  
  # Password validation
  # https://docs.djangoproject.com/en/2.2/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/2.2/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/2.2/howto/static-files/
  
  STATIC_URL = '/static/'
  django_heroku.settings(locals())
  </code></pre>
  
  <p>It errors on this get request.</p>
  
  <pre><code>def calculate(request):
      if request.method == "GET":
          calcs = Calculation.objects.filter().order_by("_id")
          print(calcs)
          calcsReversed = calcs.reverse()
          response = {"status": "1", "message": ("OK")}
          idx = 0
          for calc in calcsReversed:
              if idx &gt; 9:
                  calc.delete()
              response[idx] = {"first":calc.first,"second":calc.second,"operator":calc.operator,"result":calc.result}
              idx +=1
          print(response)
          return HttpResponse(json.dumps(response), content_type="application/json")
      elif request.method == "POST":
          jsonIncoming = json.loads(request.body.decode("utf8"))
          print(jsonIncoming)
          calculation = Calculation(result=jsonIncoming["result"], first=jsonIncoming["first"],second=jsonIncoming["second"],operator=jsonIncoming["operator"])
          calculation.save()
          response = {"status": "1", "message": ("OK"), "type":"post"}
          return HttpResponse(json.dumps(response), content_type="application/json")
  </code></pre>