On 6 Dec 2008, at 23:42, jim wrote:
>
> @ticket = Ticket.find(params[:id])
> @line_items = @ticket.line_items
>
> I think my problem is that I don't understand what is happening here.
> I thought this said:
>
> 1) ok, look up the ticket you want to work on, and here's the original
> line_items for the ticket.
> 2) now manipulate those via the params from the form ...
>
There's two levels of trickery here. First @ticket.line_items isn't an  
array. At this point the line items have not been loaded. It's a  
magical association proxy. Even if you were to sidestep that, you're  
still not copying the array. To put things another way, is

a = [1,2,3]
b = a
Then b and a are exactly the same array:
b << 4
a #=> [1,2,3,4]

> I tried stuff like:
>
> orig_line_items = @ticket.line_items
>
> orig_line_items = Array.new(@line_items)
Creating a new Array like that (or duping the original array) should  
work. I suspect that since you seemed to have been changing stuff  
slightly in desperation you did something else at the same that  
clouded the issue.

Fred

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