call field into other model in odoo | openerp

Question

I want to call following field from _name = "product.template" model :

    `'barcode': fields.related('product_variant_ids', 'barcode', type='char', string='Barcode', oldname='ean13')

above field i wanted to refer in other model named: _name = 'sale.order.line

something like this:

'barcode': fields.char('product.template', 'barcode'),

However above line of code throws error: AssertionError: Char field sale.order.line.barcode with non-integer size 'barcode'

can anyone guide me to call barcode field of one model into other model? thanks in advance

Answer 1

试试以下：

'barcode':fields.related('product_id','ean13',type="char",size=13,string="Barcode")