Cannot update a model instance in a many to many relation

Describe the bug Updating a model instance involved in a many to many relation throws the following exception:

'(1054, "Unknown column \'mytable.pivot\' in \'field list\'")'

To Reproduce

1. Declare two models connected in a many to many relation:

   class Ssl(Model):
       __table__ = 'ssls'
       @belongs_to_many('ssl_id', 'app_id', 'id', 'id', table='ssl_app')
       def apps(self):
           from .app import App
           return App
    
    class App(Model):
       __table__ = 'apps'
       @belongs_to_many('app_id', 'ssl_id', 'id', 'id', table='ssl_app')
       def ssls(self):
           from .ssl import Ssl
           return Ssl
   

2. Update an entity:

   app = App.find(2)
   
   for ssl in app.ssls:
      # custom logic to decide if update or not
      ssl.my_column = my_value
      ssl.save()   # Exception!
   

Expected behavior Model instance should be updated without issues.

Screenshots or code snippets The generated query is:

"UPDATE `ssls` SET `ssls`.`pivot` = '?', `ssls`.`my_column` = '?' WHERE `ssls`.`id` = '?'"

with the following param bindings:

0:<masoniteorm.models.Pivot.Pivot object at 0x7f656007ebf0>
1:None
2:54

Desktop (please complete the following information):

• OS: Ubuntu
• Version: 21.04

What database are you using?

• Type: MySQL
• Version: 14.14 Distrib 5.7.30, for Linux (x86_64)
• Masonite ORM 2.6.1

[josephmancuso]

Ok ill review it when you do 😃

[stoutput]

@federicoparroni Can this one be closed now? #649 has been merged.