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posfrontend
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الصورة الرمزية
Ariko Stephen Philemon

Hi all,

I’m trying to expose a custom field added on pos.order so that it can be used in the POS frontend OrderReceipt QWeb/OWL template in Odoo 18.

Goal

I want a custom field defined on pos.order to be available in the POS frontend, specifically in the order_receipt template.

What I have done

I extended the pos.order model and tried to load the field using _load_pos_data_fields method , as shown below:

pos_order.py
from odoo import models, fields, api
# pos_order.py
from odoo import models, fields, api

class PosOrder(models.Model):
    _inherit = "pos.order"

    custom_field = fields.Char()

    @api.model
    def _load_pos_data_fields(self, config_id):
        fields = super()._load_pos_data_fields(config_id)
        fields.append("custom_field")
        return fields
Frontend error

After this change, the POS UI doesn't load at all, it crashes with the following error:

installHook.js:1 TypeError: Cannot read properties of undefined (reading 'filter') at get taxTotals (point_of_sale.assets_prod.min.js:8929:1016)
What I found so far

I found a couple of older forum posts and answers that suggest extending _loader_params_pos_order method on pos.session model

However, in Odoo 18, _loader_params_pos_order no longer exists, so those solutions are no longer applicable.


What is the correct way in Odoo 18 to load additional pos.order fields into the POS frontend?

الصورة الرمزية
إهمال
الصورة الرمزية
CandidRoot Solutions
أفضل إجابة

Hello Ariko,

In Odoo 18, your approach using _load_pos_data_fields() is not correct for POS orders, and that is why the POS frontend crashes.

Why _load_pos_data_fields() does NOT work

  • In Odoo 18, POS orders are created and handled in the frontend (JS)

  • pos.order records are NOT loaded from backend when POS starts

  • _load_pos_data_fields() is meant for models fetched during POS loading, not for runtime orders

Because of this:

  • POS expects a specific data structure

  • Adding extra fields via _load_pos_data_fields() breaks the JS model

  • Result: POS crashes (taxTotals → undefined.filter error)

So this error is expected behavior, not a bug.

Correct way in Odoo 18 (Recommended)

To show a custom field on the POS receipt, you must extend the frontend export logic, not backend loading.

Patch export_for_printing() in JS
// static/src/app/models/pos_order.js
import { PosOrder } from "@point_of_sale/app/models/pos_order";
import { patch } from "@web/core/utils/patch";

patch(PosOrder.prototype, {
    export_for_printing(baseUrl, headerData) {
        const result = super.export_for_printing(baseUrl, headerData);
        result.custom_field = this.custom_field || "";
        return result;
    },
});
Display it in the receipt template
<t t-name="your_module.OrderReceipt"
   t-inherit="point_of_sale.OrderReceipt"
   t-inherit-mode="extension">
    <xpath expr="//div[hasclass('pos-receipt-order-data')]" position="after">
        <div t-esc="props.data.custom_field"/>
    </xpath>
</t>
Why this works

  • export_for_printing() is the single source of truth for receipt data

  • Receipt templates only consume what this method returns

  • This is the official and stable approach in Odoo 18

    If this clarification helped you, kindly upvote.

    Best Regards

    CandidRoot Solutions Pvt. Ltd.
  • Mobile: (+91) 8849036209
  • Whatapp: (+91) 8849036209
الصورة الرمزية
إهمال
الصورة الرمزية
Kunjan Patel
أفضل إجابة
Hello Ariko Stephen Philemon,
I hope you are doing well

Odoo 18: Custom Field in POS Receipt
Patch export_for_printing() in JS
  // static/src/app/models/pos_order.js
  import { PosOrder } from "@point_of_sale/app/models/pos_order";
  import { patch } from "@web/core/utils/patch";

  patch(PosOrder.prototype, {
      export_for_printing(baseUrl, headerData) {
          const result = super.export_for_printing(baseUrl, headerData);
          result.custom_field = this.custom_field || "";
          return result;
      },
  });

 Display in template
  <t t-name="module.OrderReceipt" t-inherit="point_of_sale.OrderReceipt" t-inherit-mode="extension">
      <xpath expr="//div[hasclass('pos-receipt-order-data')]" position="after">
          <div t-esc="props.data.custom_field"/>
      </xpath>
  </t>  

Why _load_pos_data_fields doesn't work: Orders are created in frontend JS, not loaded from backend. The receipt uses export_for_printing() to build its data.

I hope this information helps you

Thanks & Regards
Kunjan Patel
الصورة الرمزية
إهمال
الصورة الرمزية
Bay Forward LLC
أفضل إجابة
Extend the OrderReceipt widget in your custom module and add your field in the render method. Example:\
\
```javascript\
OrderReceipt.include({\
    render: function() {\
        this._super.apply(this, arguments);\
        this.$el.find('.receipt-container').append('<div>' + this.pos.get_order().your_custom_field + '</div>');\
    }\
});\

```

الصورة الرمزية
إهمال
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