From: "David A. Black" <dblack@...>
Date: 2007-12-03T15:58:46+09:00
Subject: Re: Class Help - Accessing Parent Methods from Child

Hi --

On Mon, 3 Dec 2007, Michael Boutros wrote:

> Hello everyone, I'm working on an API for Google Reader, and I'm having
> some trouble with classes and inheritance and the like. I've got my main
> class, Reader, and then two children classes, Subscription < Reader and
> Item < Reader. Now, in my instance of Reader, I have two class variables
> set: @headers, which are the headers that are to always be included in
> the Net::HTTP call, and @connection, the Net::HTTP instance that is
> connected to the Google Reader API.
>
> I then have a method called get_page in Reader, which takes a URL and
> any custom headers, then does the call. All this works perfectly well,
> when #get_page is called from Reader. However, I also want to call
> get_page from Subscription and Item. However, understandably, when I
> call it from Subscription, I get an error that @connection and @headers
> are undefined. I don't know where to start or what to do.

The variables you've mentioned (@headers and @connection) are instance
variables, not class variables. Class variables have two @@'s.


David

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