How to display the currency sign ($) in a form view?

Question

Hello guys!
We are in Odoo 10.
See this form view. Two prices are displayed with the currency sign ($) at the right :

In a new custom view, I'm trying to display this same currency sign ($). But I'm unable.
My field is defined with :
montant_perte = fields.Float('Montant de la perte', default=1.0)
In my form view (who works well), my field is displayed with :
<field name="montant_perte" widget='monetary' options="{'currency_field': 'currency_id'}" /> No trace of the currency sign $... Grrr.
Cou

Pascal Tremblay · Accepted Answer

Here is our solution!

In the class :
@api.multi
def _compute_currency_id(self):
try:
main_company = self.sudo().env.ref('base.main_company')        except ValueError:
main_company = self.env['res.company'].sudo().search([], limit=1, order="id")        for template in self:
template.currency_id = template.company_id.sudo().currency_id.id or main_company.currency_id.id
currency_id = fields.Many2one('res.currency', 'Currency', compute='_compute_currency_id')     montant_perte = fields.Float('Monta

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