Problem with classes

Hi,
I'm trying to switch from XML to Berkeley DB for the purpose of
saving comments entered on my website, and encountered some problems.
I'm saving my data in a class I defined, which I believe is a standard
way of doing this under Berkeley DB (though I could be wrong) and
read it in again when I need it. However, when I do this, Apache
displays a 503 error, and the log says:

   [error] mod_ruby: error in ruby:
   in `load': undefined class/module Entry (ArgumentError)

Well, "Entry" is defined in the same file as the code using it, and in
fact it works flawlessly when invoked from the command line - it's
just when I'm using Apache that I get this error. Does anybody know
what might be the cause of this curious behaviour? Thanks for any
input on this.

Here's the file (minus the <% %>) that fails for me:

require "cgi"
require "bdb"

class Entry
        attr_writer :comments
        attr_reader :comments, :entry_id
        
        def initialize(entry_id)
                @entry_id = entry_id
                @comments = Array.new
        end
        
        def to_s
                "#@entry_id: #{comments.size} Kommentare"
        end
end

class Comment
        attr_writer :time
        attr_reader :time, :body, :name_link
        
        def initialize(name, email, url, body)
                @time = Time.now
                @timestamp = Time.now.strftime("%a, %d.%m.%y um %H:%M:%S")
                @name = name
                @email = email
                @url = url
                @body = body
                if url != ''
                    @name_link = "<a target=\"_blank\" href=\"#{url}\">#{name}</a>"
            else
                    @name_link = name
                end
        end
        
        def to_s
      "#@name (#@email, #@url) at #@time:\n#@body"
        end
end

def link_comments(id)
  db = BDB::Btree.open "data/comments", nil, BDB::CREATE, 0644

###### The following line will fail: #######
  
  comment_number = Marshal.load(db[id]).comments.size
  db.close

  comment_link_text = "Kommentare (#{comment_number})"
  comment_link = "<a href=\"comments.html?entry_id=#{CGI.escapeHTML(id)}\" onclick=\"OpenComments(this.href); return false\">#{comment_link_text}</a>"

  return comment_link
end

-- 
Bye: Andi S.                          mailto:[email protected]