django admin filter change_list fields according to the user group
class Product(models.Model):
    name = models.CharField(...)
    description = models.CharField(...)
    approved = models.CharField(max_length=1, choices=(('y', 'yes'), ('n','no'), ('w', 'waiting'))

def get_form(self, request, obj=None, **kwargs):
    ....
    ....
    defaults = {
        "form": self.form,
        "fields": fields,
        "exclude": exclude,
        "formfield_callback": curry(self.formfield_for_dbfield, request=request),
    }
    defaults.update(kwargs)
    ...

def __init__(self,*args, **kwargs):
        self.user=None
        if kwargs:
            self.user = kwargs.pop('user')

def is_user_in_group(user,group_name):
    return user.groups.filter(name=group_name).count() == 1

self.fields['some_field_to_hide'].widget = widgets.HiddenInput