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I try to put the value from currency "rate" to my account_invoice rows.

my field looks like this:


show_rate = fields.Char(related="res_currency.rate", store=True)


this gives me everytime an error with res_currency. 

I want to see the "rate" field in my account_invoice rows. How can I manage that?


thank you

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It's not fair to use related field here. Related field will write back the value to the currency table.

If you only need to see the value, you could use a functional field.

@api.one
@api.depends('currency_id', 'currency_id.rate')
def _compute_amount(self):
    self.currency_rate = self.currency_id.rate
currency_rate = fields.Float('Currency Rate', compute='_currency_rate', store=True)
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