Odoo PoS dropdown from Many2one (widget.pos?)
<p>I want to add a dropdown from a Many2one I've created to the pos.xml file (I know how to inherit from this), can someone help me with this?</p>

<p>I saw in the code that for every dropdown they used <strong>widget.pos.<em>name</em></strong>, but this I can't seem to find it anywhere. Here is an example for countries (here I want to replace it by my variable).</p>

<pre><code>                &lt;select class='detail client-address-country' name='country_id'&gt;
                    &lt;option value=''&gt;None&lt;/option&gt;
                    &lt;t t-foreach='widget.pos.countries' t-as='country'&gt;
                        &lt;option t-att-value='country.id' t-att-selected="partner_country_id ? ((country.id === partner.country_id[0]) ? true : undefined) : undefined"&gt; 
                            &lt;t t-esc='country.name'/&gt;
                        &lt;/option&gt;
                    &lt;/t&gt;
               &lt;/select&gt;
</code></pre>

<p>I don't know where the t-foreach='widget.pos.countries' comes from and how I can manage this for my own variable called "domain" which is part of a class "domainnames". And called from a Many2one from res.partner</p>