Ruby on Rails

On Apr 28, 2:34 pm, Sergio Ruiz <li...@ruby-forum.com> wrote:
> wondering if there is a way to do this..
>
> say we have a model that has attributes length and width..
>
> :length and :width
>
> and we have a class square:
>
> class Square < ActiveRecord::Base
>
>   def area
>     area = length * width
>   end
>
> end
>
> is there a way i can do a:
>
> Square.find(:area => '144')
>
> to produce any squares with an area of 144?
>
> i know there are lots of other ways to do this, but in the case i am
> working on, a find would be REALLY clean..

Not directly (although clearly you could write Square.where('length *
width = 144'), or define a named scope that does this. you also can't
use indexes for queries like this (unless your db supports functional
indexes)

Fred

--
You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group.
To post to this group, send email to rubyonrails-talk@googlegroups.com.
To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.