From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-09-26T05:31:02+09:00
Subject: Re: Need assistance with hash of arrays and injecting values

On Sat, Sep 25, 2010 at 2:29 PM, Alpha Blue <jdezenzio@gmail.com> wrote:
> I'm creating a class that will run a number of tasks based on a start
> and end date.  It only runs between week 4 and week 15 of my current
> system.
>
> A current hash of arrays is defined for the current calendar year the
> tasks run.
>
> @h = {
>  :week_four => ["2010-09-20", "2010-09-26"],
>  :week_five => ["2010-09-27", "2010-10-03"],
>  :week_six => ["2010-10-04", "2010-10-10"],
>  :week_seven => ["2010-10-11", "2010-10-17"],
>  :week_eight => ["2010-10-18", "2010-10-24"],
>  :week_nine => ["2010-10-25", "2010-10-31"],
>  :week_ten => ["2010-11-01", "2010-11-07"],
>  :week_eleven => ["2010-11-08", "2010-11-14"],
>  :week_twelve => ["2010-11-15", "2010-11-21"],
>  :week_thirteen => ["2010-11-22", "2010-11-28"],
>  :week_fourteen => ["2010-11-29", "2010-12-05"],
>  :week_fifteen => ["2010-12-06", "2010-12-12"]
> }
>
> I want to inject these into a similar task:
>
> @current_week is an instance variable within the class that holds the
> current week (i.e. week 10 for instance so '10')
>
> @weekly_report is defined as an array that will hold the report
> listings.
>
> The VirtualReport.reportlistings method takes two dates - a start date
> and an end date.  I only want them to run up to the current week.  So,
> in this example, if it's week 10, it should run a report for week
> 4,5,6,7,8,9, and 10.  But, it should not run a report for
> 11,12,13,14,15.  Furthermore, it should check to ensure that the data is
> not empty.
>
> for i in 0..(@current_week-4)
>  @weekly_report = VirtualReport.reportlistings("INSERT HASH VALUES")
> end
>
> Where I placed the INSERT HASH VALUES above is where I want to inject my
> values based on the current week.  Therefore, I'm pretty certain the
> hash needs to be ordered or sorted so that they maintain the current
> week layouts.  But, I'm not very good with hashes in general and could
> use some help or a better example of how to accomplish this task.  The
> weekly reports will be stored in an array and used later on in the
> class.
>
> Any help would be appreciated.

If I understood correctly, you want to get for values of i
4,5,6,7,8,9,10 the arrays corresponding to the key :week_<week>,
so, first, you need to translate from the number to the word (4 =>
four). The easiest way would be to change your @h array, if possible:

@h = {
  4 => ["2010-09-20", "2010-09-26"],
  5 => ["2010-09-27", "2010-10-03"],
  ...
}

If this is not possible, I would build a translation hash for that:

TRANSLATION = {4 => :week_four, 5 => :week_five, ...}

and do:

4.upto(@current_week) do |week|
  weekly_report = VirtualReport.reportlistings(@h[TRANSLATION[i]])
  # do something with the report
end

Hope this helps,

Jesus.