The sum of the values

Rails
1

Hi!
I want to find sum of values for a particular field of all the
records. Right nw i m doing it using simple looping mechanism.
@dummy=0
@quotations.each do|quotation|@dummy+=quotation.value end
Is there any other way for doing this??
Also, when i m using an observer on a dropdown where on selecting
a
vendor’s name from it, would result in shwoing the list of quotations
from
him. This is working for some vendors only. Wot cud be the problem??
Thnx and regards,
Swanand

2

Hi –

On Mon, 29 Jan 2007, swanand deodhar wrote:

Hi!
I want to find sum of values for a particular field of all the
records. Right nw i m doing it using simple looping mechanism.
@dummy=0
@quotations.each do|quotation|@dummy+=quotation.value end
Is there any other way for doing this??

This should do it:

total = @quotations.sum(:value)

 Also, when i m using an observer on a dropdown where on selecting a

vendor’s name from it, would result in shwoing the list of quotations from
him. This is working for some vendors only. Wot cud be the problem??

I can’t tell without some more information.

David

–
Q. What is THE Ruby book for Rails developers?
A. RUBY FOR RAILS by David A. Black (Ruby for Rails)
(See what readers are saying! http://www.rubypal.com/r4rrevs.pdf)
Q. Where can I get Ruby/Rails on-site training, consulting, coaching?
A. Ruby Power and Light, LLC (http://www.rubypal.com)

3

Hi!
I m hvng a list of vendor’s with me. In the view i hve attached an
observer to the dropdown of this vendor’s list.
<%= observe_field (:vendor_name_id
:frequency=>1,
:update=>‘ob_div’,
:url=>{:action=>:quotation}) %>
Now, once the user selects a vendor from the dropdown,thn in the
quotation
action in controller, i m trying to find out his credit rating and the
credit period expiry date for the latest order placed with him(with some
date arithmatic)
@vendor=Entry.find_by_name(request.raw_post).
which will populate the ob_div. This is working for some vendors and not
all. In the vendor’s table i m hvng the column called as 'credit_rating"
Wot cud be wrong?
Thnx and regards,
Swanand