class kw_onboarding_handbook(models.Model): 

_name = 'kw_onboarding_handbook'
location = fields.Selection([('0', 'Select location')], default='0')

category = fields.Many2one('kw_onboarding_handbook_category') 

title = fields.Char(string="Title",required=True) 

description = fields.Text(string="Description",required=True) 

attachment = fields.Binary(string='Attachment',attachment=True) ​

expires_on = fields.Date(string="Expires on")

period_from = fields.Datetime(string="Period from", default=fields.Datetime.today()) 

period_to = fields.Date(string="Period to") 

@api.multi 

def get_stock_file(self):

return {

'type': 'ir.actions.act_window', 

'res_model': 'kw_onboarding_handbook',

'view_mode': 'form', 

'view_type': 'form',

'res_id': self.id, 

# 'views': [(False, 'form')],

'target': 'new', }