'Instead of the classic form view, redirect to the post on the website directly'

@api.multi
def get_access_action(self):

    self.ensure_one()
    return {'type': 'ir.actions.act_url', 'url': ('/forum/%s/question/%s' % (self.forum_id.id, self.id)), 'target': 'self', 'res_id': self.id}
