How to extend a qweb template in Odoo? - odoo

Question

Im trying to extend the point of sale, template to modify the web ticket and the printed version also.... I want to put a codebar with the id numbe. But reading and testing my code doesn't work.... For testing purpuse I put a text in several parts of the template to watch if it is modify... but it's not.
<?xml version="1.0" encoding="UTF-8"?>
<templates xml:space="preserve">
<t t-extend="XmlReceipt">
<t t-jquery=".receipt-change" t-operation="inner">
<div><span>hello world</span></div>
</t>
</t>
<t t-extend="PosTicket">
<t t-jquery=".receipt-orderlines .product_line" t-operation="inner">
<div><span>hello world</span></div>
</t>
</t>
<t t-extend="PaymentScreenWidget">
<t t-jquery="div.pos-payment-container" t-operation="inner">
<div>
Payment Screen Modified
</div>
</t>
</t>
</templates>
This code is in a file name pos.xml and I append it from openerp.py like this:
'qweb': ['static/src/xml/pos.xml'],
Why the XmlReceipt or the PosTicket or the payment template are not extending????
Then when I sucessfully extend the template, Im gonna try to replace the hello world with
<barcode encoding="CODE128"><t t-esc="o.id"/></barcode>
Thanks!
[EDIT]
Ok, now I'm extending the template, but I cant generate the barcode from the order.sequence_number
I'm trying like this:
<img class="img-responsive" t-att-src="'/report/barcode/?type=%s&value=%s&width=%s&height=%s' % ('Code128', order.sequence_number, 500, 100)" style="width:250px;height:50px;"/>
The barcode its not generate like this... but if I do it like this it is
<img t-att-src="'/report/barcode/Code128/*mycode*'" style="width:250px;height:50px;"/>
So I think the error is in the string rendering.....

Answer 1

This is how I extends the mail chatter in odoo-10 and it's working fine for me.
Take a look, may be its help if still needed.
<templates>
<!--
Chatter composer
-->
<t t-extend="mail.chatter.ChatComposer">
<!-- Insert information before the composer -->
<t t-jquery=".o_composer_suggested_partners" t-operation="replace">
<!-- List of followers -->
<div class="o_composer_suggested_partners">
<t t-foreach='widget.suggested_partners' t-as='recipient'>
<div t-attf-title="Add as recipient and follower (reason: #{recipient.reason})">
<input type="checkbox" t-att-data-fullname="recipient.full_name"/>
<t t-esc="recipient.name"/>
<t t-if="recipient.email_address">(<t t-esc="recipient.email_address"/>)</t>
</div>
</t>
</div>
</t>
</t>
</templates>