A veces necesitamos mostrar el tipo de cambio al USD de cada compañía siempre.

Lo que vamos a lograr usando OWL especificamente con systray menu es mantener el tipo de cambio del día en la moneda de la compañía en la que nos encontremos al dolar (USD)

​res_currency.py​

# -*- coding: utf-8 -*-
from odoo import models
from datetime import date

class ResCurrency(models.Model):
    _inherit = "res.currency"

    def exchange_rate_usd(self):
        currency_usd = self.env.ref("base.USD")
        company = self.env.company
        rate = company.currency_id._convert(
            from_amount=1.0,
            to_currency=currency_usd,
            company=company,
            date=date.today(),
        )
        return {
            "rate": rate,
            "symbol": currency_usd.symbol,
            "currency_id": currency_usd.id,
        }

​currency_rate.js​

/** @odoo-module **/
import { Component, useState, onWillStart } from "@odoo/owl";
import { registry } from "@web/core/registry";
import { useService } from "@web/core/utils/hooks";
import { Dropdown } from "@web/core/dropdown/dropdown";
import { DropdownItem } from "@web/core/dropdown/dropdown_item";
import { session } from "@web/session";

class CurrencyRate extends Component {
  setup() {
    super.setup(...arguments);

    this.state = useState({
      rate_usd: { rate: 0.0, symbol: "", currency_id: 0 },
    });
    this.action = useService("action");
    this.orm = useService("orm");

    onWillStart(async () => {
      const rate_usd = await this.orm.call(
        "res.currency",
        "exchange_rate_usd",
        [session.company_id]
      );
      this.state.rate_usd = rate_usd;
    });
  }

  get rate_usd() {
    const { rate, symbol } = this.state.rate_usd;
    return `${symbol} ${rate}`;
  }

  _openCurrencyUSD() {
    const { currency_id } = this.state.rate_usd;
    if (currency_id) {
      this.action.doAction({
        type: "ir.actions.act_window",
        name: "Monedas - USD",
        res_model: "res.currency",
        view_mode: "form",
        views: [[false, "form"]],
        res_id: currency_id,
        target: "new",
      });
    }
  }
}

CurrencyRate.template = "CurrencyRate";
CurrencyRate.components = { Dropdown, DropdownItem };
export const currencyRate = { Component: CurrencyRate };

registry.category("systray").add("CurrencyRate", currencyRate, { sequence: 1 });

​currency_rate.xml​

<?xml version="1.0" encoding="utf-8"?>

<templates xml:space="preserve">

    <t t-name="CurrencyRate">

        <Dropdown>

            <button>

                <i class="fa fa-lg fa-exchange" role="img" aria-label="Currency USD"></i>

                <span class="badge rounded-pill">

                    <t t-esc="rate_usd"/>

                </span>

            </button>

            <t t-set-slot="content">

                <DropdownItem >

                    <div t-on-click="_openCurrencyUSD">

                       Moneda - USD

                    </div>

                </DropdownItem>

            </t>

        </Dropdown>

    </t>

</templates>

Resultado: