#26459: DecimalField float rounding
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Reporter: yasondinalt | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.9
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 1
Easy pickings: 0 | UI/UX: 0
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DecimalField has weird behavior in case of float values passed to field.
If decimal_places = 1
float 2.15 will be saved as 2.1 (!)
float 2.25 will be saved as 2.2 (!)
But if float value first converted to str:
float 2.15 will be saved as 0.2 (ok)
float 2.25 will be saved as 0.2 (!)
It's because of default decimal rounding ROUND_HALF_EVEN.
As I understand build-in round() use rounding similar to ROUND_HALF_UP.
I tried first cast float to str, then use ROUND_HALF_UP, so now:
float 2.15 will be saved as 0.2 (ok)
float 2.25 will be saved as 0.3 (ok)
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Ticket URL: <https://code.djangoproject.com/ticket/26459>
Django <https://code.djangoproject.com/>
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