copying variables between rows

rubyonrails-talk
1

Is there an elegant way of copying some variables from one row to another row?

Here is the current code:

color = Color.find(id, :select => "a, b, c, d, e, f") copy = Color.find(copy, :select => "c, d, e")

color.c = copy.c color.d = copy.d color.e = copy.e

color.update

2

don't know if it's a good idea but color.attributes = copy.attributes would probably do the trick

Fred

3

Is there an elegant way of copying some variables from one row to another row?

Here is the current code:

color = Color.find(id, :select => "a, b, c, d, e, f") copy = Color.find(copy, :select => "c, d, e")

color.c = copy.c color.d = copy.d color.e = copy.e

don't know if it's a good idea but color.attributes = copy.attributes would probably do the trick

Fred

You probably need to be aware that using :select causes the Color objects to be marked readonly and cannot be saved. Add

-Rob

Rob Biedenharn http://agileconsultingllc.com Rob@AgileConsultingLLC.com

4

Thanks Fred,

color.attributes = copy.attributes did the trick.

Your help has saved hundreds of lines of code.

Previously I tried .clone, .dub, .reject, .to_hsh, .hash, and more. I knew there was a very simple answer.

Thanks Rob,

That is a good point. In the working code "select" is not used on color, only copy.

Mark