eiru_pos/models/account_voucher.py

from openerp import api, fields, models
from openerp.exceptions import except_orm

class AccountVoucher(models.Model):
    _inherit = 'account.voucher' 

    @api.model
    def create_from_pos(self, values):

        # Activity 1: Create Sale Order
        sale_order_model = self.env['sale.order']

        # sale_order_line_values = [
        #     [0, False, { 
        #         'product_id': int(item['id']), 
        #         'product_uom_qty': float(item['qty']), 
        #         'price_unit': float(item['price']) 
        #     }] for item in values['cart_items']]

        # sale_order_values = {
        #     'partner_id': int(values['customer_id']),
        #     'order_line': sale_order_line_values,
        #     'picking_policy': 'direct'
        # }

        # sale_order_id = sale_order_model.create(sale_order_values)
        sale_order_id = 26

        # Activity 2: Confirm Sale Order
        sale_order = sale_order_model.browse([sale_order_id])
        # sale_order.write({ 'state': 'manual' })

        # for sale_order_line in sale_order.order_line:
        #     sale_order_line.write({ 'state': 'confirmed' })

        # Activity 3: Create Invoice
        account_id = False
        decimal_precision = self.env['decimal.precision'].precision_get('Product Price')
        account_invoice_model = self.env['account.invoice']

        for sale_order_line in sale_order.order_line:
            account_id = sale_order_line.product_id.property_account_income.id

            if not account_id:
                account_id = sale_order_line.product_id.categ_id.property_account_income_categ.id

                if not account_id:
                    raise except_orm('Error', 'Es necesario denifir una cuenta de ingresos para este producto')

            uos_quantity = sale_order_line.product_uos_qty or 0.0 if sale_order_line.product_uos else sale_order_line.product_uom_qty
            uos_id = sale_order_line.product_uos.id if sale_order_line.product_uos else sale_order_line.product_uom.id
            fiscal_position = sale_order_line.order_id.fiscal_position or False

            subtotal = round(sale_order_line.price_unit * sale_order_line.product_uom_qty / uos_quantity, decimal_precision)