如何在Odoo12的pos.order模型中添加产品过滤器

filtered_products = fields.Many2many('product.product', string='Filtered Products')

<field name="filtered_products" widget="many2many_tags"/>

def search(self, args, offset=0, limit=None, order=None, count=False):
    if self.env.context.get('filtered_products'):
        args += [('product_id', 'in', self.env.context['filtered_products'])]
    return super(PosOrder, self).search(args, offset=offset, limit=limit, order=order, count=count)

<record id="view_pos_order_form" model="ir.ui.view">
    <field name="name">pos.order.form</field>
    <field name="model">pos.order</field>
    <field name="arch" type="xml">
        <form>
            ...
            <group>
                <field name="filtered_products"/>
            </group>
            ...
        </form>
    </field>
</record>