Odoo 12：采购订单佣金字段无法同步至创建账单的发票表单求助

Hey there! Let's break down what's going wrong here and fix it step by step:

1. You forgot to add the commission field to account.invoice #

First off, even if you pass the commission value from the purchase order to the invoice, the account.invoice model doesn't have this field defined—so it won't store the value, and you definitely won't see it in the form view. Let's fix that first:

from odoo import models, fields, api, _
from odoo.exceptions import UserError

class AccountInvoice(models.Model):
    _inherit = "account.invoice"
    
    commission = fields.Float(string='Commission', default=0)

You also need to add this field to the account.invoice form view so it shows up in the UI. Add this XML to your module:

<record id="view_account_invoice_form_inherit_commission" model="ir.ui.view">
    <field name="name">account.invoice.form.inherit.commission</field>
    <field name="model">account.invoice</field>
    <field name="inherit_id" ref="account.invoice_form"/>
    <field name="arch" type="xml">
        <!-- Adjust the position to where you want the field to appear -->
        <field name="reference" position="after">
            <field name="commission" attrs="{'readonly': [('state', '!=', 'draft')]}"/>
        </field>
    </field>
</record>

2. Your action_view_invoice method has API and logic issues #

Your current method mixes old-style ORM (using cr, uid, pool) with new API decorators (@api.multi), and it's not returning the correct action to open the invoice view. Here's the corrected version that properly passes the commission value:

class ConfirmComm(models.Model):
    _inherit = "purchase.order"
    commission = fields.Float(string='Commission', required=True, default=0)

    @api.multi
    def action_view_invoice(self):
        self.ensure_one()
        # Call the original method to keep default behavior
        res = super(ConfirmComm, self).action_view_invoice()
        
        # Handle existing invoice or new invoice creation
        if res.get('res_id'):
            # If invoice already exists, update its commission value
            invoice = self.env['account.invoice'].browse(res['res_id'])
            invoice.write({'commission': self.commission})
        else:
            # If creating a new invoice, add commission to default values
            context = res.get('context', {})
            default_vals = context.get('default', {})
            default_vals['commission'] = self.commission
            res['context'] = dict(context, default=default_vals)
        
        return res

Key Notes: #

• API Consistency: We use pure modern Odoo API (no cr/uid parameters, self.env instead of pool) to avoid conflicts.
• Preserve Original Flow: Calling super() ensures we don't break the default "Create Bill" logic—we just add our commission value on top.
• Cover All Scenarios: The code handles both cases: when an invoice already exists for the order, and when you're creating a brand new one.

内容的提问来源于stack exchange，提问作者myriam