From: tamouse mailing lists <tamouse.lists@...>
Date: 2013-04-03T05:26:35+09:00
Subject: Re: How to quote variable of an array

On Mon, Apr 1, 2013 at 8:26 PM, sundar sundar <lists@ruby-forum.com> wrote:
> disk_list = [udisk_udisk.EnumerateDevices]

This looks interesting. What actually does #EnumerateDevice return? In
that construction, you are wrapping that in an array. Is it already an
array of strings? I suggest at this point doing `p disk_list` to see
what it actually contains. My suspicion is that you've got an array of
array of strings there, but I don't know the method, obviously.

> disk_list.each { |disk|
> #puts %Q{"#{disk}"}
> puts disk

If this is the source of the lines below....

> udisk_udisk = udisk_service.object("#{disk}")
> udisk_udisk.introspect
> udisk_udisk_i = udisk_udisk["org.freedesktop.UDisks.Device"]

... what does the following line show? (and where is it in the output?)

> puts udisk_udisk_i["IdUuid"]


> }
>
> disk_list is array of available disks attached to system. When i use
> "put disk" in the loop i list all the disk with out problem. Like this
> /org/freedesktop/UDisks/devices/sr0
> /org/freedesktop/UDisks/devices/sdc
> /org/freedesktop/UDisks/devices/sdb
> /org/freedesktop/UDisks/devices/sda
> /org/freedesktop/UDisks/devices/sda1
> /org/freedesktop/UDisks/devices/sda2
> /org/freedesktop/UDisks/devices/sda3
> /org/freedesktop/UDisks/devices/sdc1
> /org/freedesktop/UDisks/devices/sda5
> /org/freedesktop/UDisks/devices/sda6
> /org/freedesktop/UDisks/devices/sdb1
> /org/freedesktop/UDisks/devices/sda7
> /org/freedesktop/UDisks/devices/sda8
>
> But when i quote with either "puts %Q{"#{disk}"}" or "p disk.to_s" then
> the output becomes
> "/org/freedesktop/UDisks/devices/sr0/org/freedesktop/UDisks/devices/sdc/org/freedesktop/UDisks/devices/sdb/org/freedesktop/UDisks/devices/sda/org/freedesktop/UDisks/devices/sda1/org/freedesktop/UDisks/devices/sda2/org/freedesktop/UDisks/devices/sda3/org/freedesktop/UDisks/devices/sdc1/org/freedesktop/UDisks/devices/sda5/org/freedesktop/UDisks/devices/sda6/org/freedesktop/UDisks/devices/sdb1/org/freedesktop/UDisks/devices/sda7/org/freedesktop/UDisks/devices/sda8"
>
> What i want is that to list available disk with quote like this
>
> "/org/freedesktop/UDisks/devices/sr0"
> "/org/freedesktop/UDisks/devices/sdc"
> "/org/freedesktop/UDisks/devices/sdb"
> .
> .
> .
> "/org/freedesktop/UDisks/devices/sda8"
>
> so that the line "udisk_udisk = udisk_service.object("#{disk}")" takes
> disk one by one.
>
> When i provide disk_list data manually with
>
> ["/org/freedesktop/UDisks/devices/sr0",
> "/org/freedesktop/UDisks/devices/sdc","/org/freedesktop/UDisks/devices/sdb",
> ..., "/org/freedesktop/UDisks/devices/sda8"]
>
> and execute looping then it works.
>

Here is where I think you've got something different in disk_list than
you expect. Checking the output of the #EnumerateDevice method should
show this.

If instead of the above manual list, try this:

[["/org/freedesktop/UDisks/devices/sr0",
"/org/freedesktop/UDisks/devices/sdc","/org/freedesktop/UDisks/devices/sdb",
..., "/org/freedesktop/UDisks/devices/sda8"]]

(extra array wrapped around it)