# Book Shelf app in 'Ruby on Rails Bible' book

**URL:** <https://www.ruby-forum.com/t/book-shelf-app-in-ruby-on-rails-bible-book/169116>\
**Category:** Rails\
**Created:** [May 29, 2009, 5:39pm UTC](https://www.ruby-forum.com/t/book-shelf-app-in-ruby-on-rails-bible-book/169116 "2009-05-29T17:39:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rails\_n00b](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/2acd7d/32.png) [@rails\_n00b](https://www.ruby-forum.com/u/rails_n00b)\
**Post date:** [May 29, 2009, 5:39pm UTC](https://www.ruby-forum.com/t/book-shelf-app-in-ruby-on-rails-bible-book/169116/1 "2009-05-29T17:39:07Z")

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I’m trying to follow through with the Book Shelf app that’s in the  
‘Ruby on Rails Bible’ book and I’m at a point where I’m trying to  
install Ruby/Amazon. I downloaded the Ruby/Amazon and extracted it as  
instructed. Now I’m at the step where I need to drop into a Ruby  
console to verify the Ruby/Amazon installation.

In the console I typed :

> > require ‘amazon/aws/search’  
> > RuntimeError: Unsupported digest algorithm (sha256).  
> > from /Users/kevin/dev/Ruby/book\_shelf/lib/amazon/aws/search.rb:34:in  
> > `initialize' from /Users/kevin/dev/Ruby/book_shelf/lib/amazon/aws/search.rb:34:in`new’  
> > from /Users/kevin/dev/Ruby/book\_shelf/lib/amazon/aws/search.rb:34  
> > from /Library/Ruby/Site/1.8/rubygems/custom\_require.rb:31:in  
> > `gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in`require’  
> > from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.2/lib/  
> > active\_support/dependencies.rb:156:in `require' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:521:in`new\_constants\_in’  
> > from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.2/lib/  
> > active\_support/dependencies.rb:156:in `require’  
> > from (irb):1
> 
> >

I’m too much of Ruby n00b to know what that error means or how to  
resolve it. Any suggestions? It probably has something to do with the  
fact that I’m using different versions of Ruby, rails, gems, Ruby/  
Amazon since that book was written in '08 (likely '07).

Ruby

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<div class="post-metadata">

**Author:** ![rails\_n00b](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/2acd7d/32.png) [@rails\_n00b](https://www.ruby-forum.com/u/rails_n00b)\
**Post date:** [May 30, 2009, 12:04pm UTC](https://www.ruby-forum.com/t/book-shelf-app-in-ruby-on-rails-bible-book/169116/2 "2009-05-30T12:04:18Z")

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On May 29, 4:38 pm, rails\_n00b [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> I’m trying to follow through with the Book Shelf app that’s in the  
> ‘Ruby on Rails Bible’ book and I’m at a point where I’m trying to  
> install Ruby/Amazon. I downloaded the Ruby/Amazon and extracted it as  
> instructed. Now I’m at the step where I need to drop into a Ruby  
> console to verify the Ruby/Amazon installation.
> 
> In the console I typed :
> 
> > > require ‘amazon/aws/search’  
> > > RuntimeError: Unsupported digest algorithm (sha256).

It looks like Ruby/Amazon is asking openssl whether it supports the  
sha256 algorithm and openssl is saying no. Before you go any further  
with this I found the following on the homepage for Ruby/Amazon:

“Amazon is discontinuing v3 of the AWS API as of 2008-03-31. Ruby/  
Amazon will cease to work at that time.  
Ruby/AWS is the successor to Ruby/Amazon and works with v4 of the AWS  
API. Please use that library instead of this one.”

Fred