title: Unable save table after making changes in the model.py file
body: <p>I am new to django any help would be much appreciated.</p>
  
  <p>I have installed the django-excel tutorial app and made changes to its model.py file.</p>
  
  <p>I have done the following steps :</p>
  
  <p>1) python manage.py makemigrations polls</p>
  
  <p>Output : Migrations for 'polls':
    polls\migrations\0001_initial.py
      - Create model hpcl</p>
  
  <p>2) python manage.py migrate polls</p>
  
  <p>output : Operations to perform:
    Apply all migrations: polls
  Running migrations:
    No migrations to apply.</p>
  
  <pre><code>Model.py file 
  
  from django.db import models
  
  
      class hpcl(models.Model):
          plannedPLT = models.IntegerField(default=0)
          pub_date = models.DateTimeField('date published')
          consumption = models.IntegerField(default=0)
          required_PLT = models.CharField(max_length=200)
  
  
          def __str__(self):
              return self.pub_date
  
  
  Request Method: POST
  Request URL: http://127.0.0.1:8000/polls/import/
  
  Django Version: 2.2.1
  Python Version: 3.7.3
  Installed Applications:
  ('django.contrib.admin',
   'django.contrib.auth',
   'django.contrib.contenttypes',
   'django.contrib.sessions',
   'django.contrib.messages',
   'django.contrib.staticfiles',
   'polls')
  Installed Middleware:
  ('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')
  
  
  
  Traceback:
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in _execute
    84.                 return self.cursor.execute(sql, params)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\sqlite3\base.py" in execute
    383.         return Database.Cursor.execute(self, query, params)
  
  The above exception (no such table: polls_hpcl) was the direct cause of the following exception:
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\exception.py" in inner
    34.             response = get_response(request)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py" in _get_response
    115.                 response = self.process_exception_by_middleware(e, request)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py" in _get_response
    113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)
  
  File "C:\Users\dhaval1.desai\Documents\Notes\Feedstock\Django-excelV2\django-excel-master\polls\views.py" in import_data
    53.                     ['plannedPLT', 'pub_date', 'consumption', 'required_PLT']
  
  File "C:\Users\dhaval1.desai\Documents\Notes\Feedstock\Django-excelV2\django-excel-master\django_excel\__init__.py" in save_book_to_database
    63.         pe.save_book_as(**params)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\core.py" in save_book_as
    112.     return sources.save_book(book, **dest_keywords)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\internal\core.py" in save_book
    56.     return _save_any(a_source, book)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\internal\core.py" in _save_any
    60.     a_source.write_data(instance)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\plugins\sources\db_sources.py" in write_data
    111.             **self._keywords
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\plugins\renderers\django.py" in render_book_to_stream
    75.             **keywords
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel_io\io.py" in save_data
    129.         **keywords
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel_io\io.py" in store_data
    146.         writer.write(data)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel_io\book.py" in write
    221.                 sheet_writer.close()
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel_io\database\importers\django.py" in close
    58.                 an_object.save()
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\base.py" in save
    741.                        force_update=force_update, update_fields=update_fields)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\base.py" in save_base
    779.                 force_update, using, update_fields,
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\base.py" in _save_table
    870.             result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\base.py" in _do_insert
    908.                                using=using, raw=raw)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\manager.py" in manager_method
    82.                 return getattr(self.get_queryset(), name)(*args, **kwargs)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\query.py" in _insert
    1186.         return query.get_compiler(using=using).execute_sql(return_id)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\sql\compiler.py" in execute_sql
    1335.                 cursor.execute(sql, params)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in execute
    99.             return super().execute(sql, params)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in execute
    67.         return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in _execute_with_wrappers
    76.         return executor(sql, params, many, context)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in _execute
    84.                 return self.cursor.execute(sql, params)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\utils.py" in __exit__
    89.                 raise dj_exc_value.with_traceback(traceback) from exc_value
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in _execute
    84.                 return self.cursor.execute(sql, params)
  
  File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\sqlite3\base.py" in execute
    383.         return Database.Cursor.execute(self, query, params)
  
  Exception Type: OperationalError at /polls/import/
  Exception Value: no such table: polls_hpcl
  </code></pre>