Django M2M with Oracle database FieldDoesNotExist error

Hello Django community.

I have two Django models Foo and Bar that have a  ManyToMany relation:

Class Foo(models.model):    ...    bars = models.ManyToManyField('Bar', related_name='foos')

somewhere in the code, i do direct assignment to replace the relation with a new list:

foo_object.bars = [bar_object_list]

but i get:

FieldDoesNotExist: Foo_bars has no field named None

I use Django 1.8.3 with Oracle 12c

any help would be highly appreciated

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