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decimalormrelated
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Lucas Huber

I would like to include a related field from res.currency in a ORM model, but can't find any information how to deal with decimal precision in ORM.

exchange_rate = fields.Float('res.currency.rate', 
        'Exchange Rate', related='currency_id.rate',
        readonly=True)

When I open a view with the fields I get this error:

 File "/opt/odoo/odoo-server/openerp/tools/float_utils.py", line 29, in _float_check_precision

    return 10 ** -precision_digits

TypeError: bad operand type for unary -: 'str' 

Would be glad to know a workaround to solve this problem.


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Axel Mendoza
Melhor resposta

as docs saids in 

https://www.odoo.com/documentation/8.0/reference/orm.html

class openerp.fields.Float(string=None, digits=None, **kwargs) 
The precision digits are given by the attribute
        Parameters digits -- a pair (total, decimal), or a function taking a database cursor and returning a pair (total, decimal)

Your definition could be changed to this:

exchange_rate = fields.Float('res.currency.rate', 'Exchange Rate', related='currency_id.rate', readonly=True, digits=(16,2))

or you could use a managed decimal precision already defined like 

import openerp.addons.decimal_precision as dp
...
exchange_rate = fields.Float('res.currency.rate', 'Exchange Rate', related='currency_id.rate', readonly=True, digits=dp.get_precision('Account') )

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Lucas Huber
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Thank you Axel, Your solution will probably work only with not related fields. In my case I get with both solutions a "duplicate value for keyword arguments "digits"" Error.

Axel Mendoza

related fields are function fields and they need pretty much all the required attributes/arguments for field definition than normal fields, because when it gets calculated the field continue as the normal field type float and needs the digits param

Yenthe Van Ginneken (Mainframe Monkey)

Marked it as solved as this is a good answer that works fine. ;)

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Nihal Mohamood KC
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is the error solved?

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