From: Logan Capaldo <logancapaldo@...>
Date: 2007-05-07T20:26:10+09:00
Subject: Re: dynamically named variables or Constants

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On 5/7/07, Tom V. <ruby-talk@hinv.org> wrote:
>
> Hi Logan,
>
> thanks for the hint.
> However that did not get me too far.
>
> So now I use simple instance variables
> and the session storage utility.
>
> But I always get a strange error that let me to the idea
> of using constants in the first place...
>
> Although this is a rails project using a plugin,
> the error I get is from using std ruby libraries.
> so maybe you can enlighten me...
> Please have a quick look:
>
> Constructor for creating a new "live_tree":
>
> class MyController
>   # ...
>   live_tree :fstree, :find_item_proc =>
>             Proc.new { |x| FileSystemItem.new(x, @user_path) }
>   # ...
> end
>
> class FileSystemItem
>   def initialize(path, root)
>     @path = path
>     log << "root = #{root} - class = #{root.class}\n"
>     # output:
>     # root = /user/path/ - class = String
>
>     @root = File.expand_path(root)
>     # ERROR:
>     # TypeError (can't convert nil into String):
>     #  .//app/models/file_system_item.rb:17:in `expand_path'
>     #  .//app/models/file_system_item.rb:17:in `initialize'
>     #  .//app/controllers/my_controller.rb:452:in `new'
>   end
> end
>
> "root" contains the user path and is of type String.
> However, when calling File.expand_path,
> I get the NameError.
>
> When using a constant or a global variable
> this error does not occur...
>
> Any ideas?


That seems really weird. Maybe ruby is not being as clear with reporting the
error as it could be.  At this point I'd try using a debugger to get to the
bottom of it.

Thanks for your time,
> Tom.
>
>
>

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