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However, in Odoo 18, _loader_params_pos_order no longer exists, so those solutions are no longer applicable.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

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CandidRoot Solutions
Best Answer

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
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Kunjan Patel
Best Answer
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
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Bay Forward LLC
Best Answer
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>');\
    }\
});\

```

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