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Werner  
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 More options Oct 26 2012, 11:34 am
From: Werner <webagentur.la...@googlemail.com>
Date: Fri, 26 Oct 2012 08:34:32 -0700 (PDT)
Local: Fri, Oct 26 2012 11:34 am
Subject: Re: [Rails] sum decimals
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Thanks Rob.. true.. it works as expected..

Am Freitag, 26. Oktober 2012 16:53:13 UTC+2 schrieb Rob Biedenharn:

> On Oct 26, 2012, at 8:18 AM, Werner wrote:

> > I have a column "hours" which I want to sum up the decimals

> > Week.sum('hour')    => 22.5

> > But I want to "select by project_id" not the hole table.
> > Week.find_all_by_project_id(@project.id, :select => "workhour").sum
>  #undefined method `+' for #<Week hour:
> #<BigDecimal:7fd68b358400,'0.0',9(18)>>

> > I cant find anything ...some help would be great.

> You left the argument out of the .sum (i..e, .sum('hour') on the second
> one)

> I think that you just need this:

> Week.where(project_id: @project_id).sum('hour')

> -Rob


 
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