很多人都说从9.0 之后，很多社区版功能被阉割了，比如大家常说的仓库条码扫码模块就没有了。 但是却为我们留下了bcarcode模块，方便我们进行扩展。
由于有需求，需要为采购模块增加条码扫码功能，代码如下：
1.需要在purchase.order.line 增加product_barcode字段，关联自产品资料的bcarcode:

class PurchaseOrderLine(models.Model):
    _inherit = 'purchase.order.line'

    product_barcode = fields.Char(related='product_id.barcode')

2.在purchase.order.line 增加一个方法on_barcode_scanned，获取扫描枪获取的条码,同时继承扩展barcodes.barcode_events_mixin,代码如下:

class PurchaseOrder(models.Model):
    _name = 'purchase.order'
    _inherit = ['purchase.order', 'barcodes.barcode_events_mixin']

    def _add_product(self, product, qty=1.0):
        order_line = self.order_line.filtered(lambda r: r.product_id.id == product.id)
        if order_line:
            order_line.product_qty = qty
        else:
            product_lang = product.with_context({
                'lang': self.partner_id.lang,
                'partner_id': self.partner_id.id,
            })
            name = product_lang.display_name
            if product_lang.description_purchase:
                name += '\n' + product_lang.description_purchase

            vals = {
                'product_id': product.id,
                'name': name,
                'date_planned': fields.Datetime.now(),
                'product_uom': product.uom_po_id.id,
                'product_qty': 1,
                'price_unit': product.standard_price,
                'state': 'draft',
            }

            self.order_line += self.order_line.new(vals)

    def on_barcode_scanned(self, barcode):
        product = self.env['product.product'].search([('barcode', '=', barcode)])
        if product:
            self._add_product(product)

3.增加js代码，使得前端获取条码：

odoo.define('purchase_barcode.PurchaseOrderBarcodeHandler', function (require) {
    "use strict";

    var field_registry = require('web.field_registry');
    var AbstractField = require('web.AbstractField');
    var FormController = require('web.FormController');

    FormController.include({
        _barcodePurchaseAddRecordId: function (barcode, activeBarcode) {
            if (!activeBarcode.handle) {
                return $.Deferred().reject();
            }
            var record = this.model.get(activeBarcode.handle);
            if (record.data.state != 'draft') {
                this.do_warn("采购订单", '只能对草稿状态的单据增加明细');
                return $.Deferred().reject();
            }
            return this._barcodeAddX2MQuantity(barcode, activeBarcode);
        }
    })

    var PurchaseOrderBarcodeHandler = AbstractField.extend({
        init: function () {
            this._super.apply(this, arguments);

            this.trigger_up('activeBarcode', {
                name: this.name,
                fieldName: 'order_line',
                quantity: 'product_qty',
                setQuantityWithKeypress: true,
                commands: {
                    // 'O-CMD.MAIN-MENU': _.bind(this.do_action, this, 'stock_barcode.stock_barcode_action_main_menu', {clear_breadcrumbs: true}),
                    barcode: '_barcodePurchaseAddRecordId',
                }
            });
        },
    });

    field_registry.add('purchaseorder_barcode_handler', PurchaseOrderBarcodeHandler);

});

4.扩展purchase order view 部分,

<record id="view_purchase_order_barcode_inherit_form" model="ir.ui.view">
    <field name="name">purchase.order.form</field>
    <field name="model">purchase.order</field>
    <field name="inherit_id" ref="purchase.purchase_order_form"/>
    <field name="priority" eval="8"/>
    <field name="arch" type="xml">
        <form position="inside">
            <field name="_barcode_scanned" widget="purchaseorder_barcode_handler"/>
        </form>

        <xpath expr="//field[@name='order_line']/tree" position="inside">
            <field name="product_barcode" invisible="1"/>
        </xpath>
        <xpath expr="//field[@name='order_line']/kanban" position="inside">
            <field name="product_barcode" invisible="1"/>
        </xpath>
        <xpath expr="//field[@name='order_line']//field[@name='product_qty']" position="attributes">
            <attribute name="options">{'barcode_events': True}</attribute>
            <attribute name="widget">field_float_scannable</attribute>
        </xpath>
        <xpath expr="//button[@name='button_confirm']" position="attributes">
            <attribute name="barcode_trigger">validate</attribute>
        </xpath>
    </field>
</record>

这样，就可以在界面上直接用扫描枪扫码增加订单明细了。
欢迎大家讨论，参考。转载，请注明出处！