Newbie Question

Hey guys, I have a pretty much noob question here.

I’m having problems adding values that come from a database, for example
I have several orders in the database, and they have their amounts I can
them using something like

@outstanding = @bill.find_all_by_status('1').sum {|bill| 


and it works properly.

However, there are some instances where I would just like to add certain
values however everytime I want to do something like this

@outstanding += @bill.amount

It doesn’t work properly. It gives me a nil + error.

I’m sure you’ve all gone through this before. If someone could help me
would be great.

Juan Roberto Morales
Gerente General
Digital Vision Studios

You should initialize @outstanding first before trying to add something
to it. So for example first set @outstanding to zero and then do
@outstanding += @bill.amount

Kind regards,

Compare Rails hosting companies

And you’re sure that item.amount has been initialized?
I would suggest using the script/console command to test this out…
script/console opens up an IRB window that will allow you access to all
your models… you can do a find statement just like you would in your
actual site
outstanding = 0
Bill.find_by_status_id(1).each do |bill|
puts outstanding, bill.amount
outstanding += bill.amount
And see what the values are when it errors (see if it thinks that
outstanding is nil, or bill.amount)
If that works perfectly, then you are somehow un-initializing one of
values elsewhere in your application.


Thanks for the reply.

The problem I’m getting is that say I initialize it to 0 or 0.0 since
it’s a
float. I’m still getting the same issue.

It’s weird, could you or anyone else show me a working sample of this?

I’ve tried doing this

@outstanding = 0
for item in @items
if item.status == 1
@outstanding += item.amount

and I get an error.

On 2/24/07, Nick S. [email protected] wrote:
Compare Rails hosting companies

Posted via

Juan Roberto Morales
Gerente General
Digital Vision Studios

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs