From: Josh Cheek <josh.cheek@...>
Date: 2010-11-13T04:36:19+09:00
Subject: Re: Iterate through Nested Array - Noob question

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On Fri, Nov 12, 2010 at 12:52 PM, Dina W. <dinamcc@yahoo.com> wrote:

> I am new to ruby, I am trying to populate data into a form using a set
> of variables in nested loops
>
> For i do 1..2 do
>  project = @blah.create(:project, :blah =>......
>
> The above is just a spinet, but works fine
>
> For j in 1..4 do
> owner = ["tim", "alice", "candy"]
> status = ["new", "current", "out_of_date", "banned"]
>  contact = @contact.create(:contact, :owner => owner, :status =>
> status, :project = project)
>
> If I add:
> current_owner = owner[(j-1) % owner.size] it just uses the first
> variable over and over again
>
>
Did you also update the hash where you specify who is the owner? (something
to consider: in the above code, you pass an Array here, but now that you
have selected a desired owner, you have a String. Since I don't know what
code you are working with, I can't check for you that this is acceptable).

Also, if you iterate over 0..3, then you don't have to subtract 1 from j.
Also, I think you might be expecting that to iterate over 1,2,3 but two dots
is inclusive, so 1..4 will iterate over 1,2,3,4 I suspect you actually want
0..2 or, using three dots, which is exclusive, 0...3 either of which will
iterate over 0,1,2, and then you won't have to subtract 1 from i before you
mod it.


>
> The other scenario:
>
> For i do 1..10 do
>  project = @blah.create(:project, :blah =>......
>
> For j in 1..4 do
> owner = ["tim", "alice", "candy"]
> status = ["new", "current", "out_of_date", "banned"]
>  contact = @contact.create(:contact, :owner => owner, :status =>
> status)
>
> QUESTION: By having more projects than data for owners? do I have to do
> anything special to ensure it continues to loop through owner and status
> until i is done?
>
>
Right now, it is not iterating through status at all (it passes the entire
status array each time). With your above method of selecting an owner, it
does iterate through owner (though possibly incorrectly), and that is based
on the value of j, which is reset for each project. So assuming you are okay
with that, then no, you do not need to do anything special.

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