Hi, I am trying to copy ids into a many2many field, but it throws list index out of range error. Can someone please help me where I am doing a mistake

@api.onchange('course_id')
def get_default_subject_ids(self):
    res = []
    if len(self.course_id.subject_ids):
        for subject in self.course_id.subject_ids :
            res.append(subject.id)
        self.subject_ids= [0,0,res]
    return True
 
Debugged it and observed that it throws list index out of range @ self.subject_ids= [0,0,res]

Regards,

Narender