Backward query is not working with GEO Manager

I am using Geomanager for storing MultiPolygon data.

I have below tables:

il

class Customer(gismodels.Model):

    is_active = models.CharField(max_length=15, default="Inactive", choices= ACTIVE_CHOICES)

    name = models.CharField(max_length=255)

    organisation_name = models.CharField(max_length=100, blank = True)

    rating = models.CharField(max_length=25,choices=RATING_CHOICES,null=True, blank=True)

    description = models.TextField(max_length=255, blank=True)

    email_primary = models.EmailField(max_length=1000 ,null=False, default="test_RT@gmail.com")

    email_secondary = models.EmailField(max_length=1000 ,null=True, blank=True)

    phone_primary = models.CharField(max_length=1000)

    phone_secondary = models.CharField(max_length=1000, null=True, blank=True)

    address = models.CharField(max_length=2000, blank=True)

    has_shop = models.CharField(max_length=128, verbose_name="Does he have a shop?", choices=[('Yes', 'Yes'),('No', 'No')],blank=True)

    working_hours_start = models.CharField(max_length=12,blank=True,verbose_name="What is the 

    website = models.URLField(blank=True, null=True)

    expertise = models.CharField(max_length=2000, blank=True)

    experience = models.CharField(max_length=12, null=True, blank=True)

    city = models.ForeignKey(City, null=True)

    country = models.CharField(max_length=255,choices=COUNTRY_CHOICES,null=True, blank=True)

    multi_poly = gismodels.MultiPolygonField(srid=4326, null=True, blank=True,verbose_name="Service Locations")

    objects = gismodels.GeoManager()

    

    class Meta:

        db_table = 'customer'

        verbose_name = 'Customer'

        verbose_name_plural = 'Customers'

class Logs(models.Model)

    '''logs Info'''

    merchant = models.ForeignKey(Merchant, verbose_name='Merchant')

    message = models.TextField(max_length=255, blank=True)

    created_at = models.DateTimeField(auto_now_add=True)

    updated_at = models.DateTimeField(auto_now=True)

So from shell when i try to access merchant from logs object i get error

Traceback (most recent call last):

  File "<console>", line 1, in <module>

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/models/fields/related.py", line 572, in __get__

    rel_obj = qs.get()

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/models/query.py", line 351, in get

    num = len(clone)

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/models/query.py", line 122, in __len__

    self._fetch_all()

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/models/query.py", line 966, in _fetch_all

    self._result_cache = list(self.iterator())

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/models/query.py", line 265, in iterator

    for row in compiler.results_iter():

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 700, in results_iter

    for rows in self.execute_sql(MULTI):

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 786, in execute_sql

    cursor.execute(sql, params)

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 81, in execute

    return super(CursorDebugWrapper, self).execute(sql, params)

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute

    return self.cursor.execute(sql, params)

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__

    six.reraise(dj_exc_type, dj_exc_value, traceback)

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute

    return self.cursor.execute(sql, params)

  File "/home/web/Search/local/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 128, in execute

    return self.cursor.execute(query, args)

  File "/home/web/Search/local/lib/python2.7/site-packages/MySQLdb/cursors.py", line 205, in execute

    self.errorhandler(self, exc, value)

  File "/home/web/Search/local/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler

    raise errorclass, errorvalue

OperationalError: (1054, "Unknown column 'customer.city_id' in 'field list'")

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