Error: uninitialized constant MysqlCompat::MysqlRes

Here is the magic formula:

sudo gem install -v 2.7 --no-rdoc --no-ri mysql --
--with-mysql-dir=/opt/local/lib/mysql5
--with-mysql-config=/opt/local/lib/mysql5/bin/mysql_config;


Source: http://www.ruby-forum.com/topic/192550

What lead me to discover this fantastic plugin was the need to be able to call ActiveRecord observers in relation to the State of an object. With AASM, I had to incorporate my lib class calls in a method that was referenced in a state definition. I didn’t like this because it required my Model to have too much knowledge of the outside world. I think it is a best practice to encapsulate this type of functionality into an observer, leaving the model to be happy in it’s own little world. state_machine accomplishes this by allowing the placement of observer calls using a DSL provided by the plugin.

Reference: http://thewebfellas.com/blog/2008/11/2/goodbye-attachment_fu-hello-paperclip

The first is bundle-fu. This plugin does not actually compress the files, but rather combines all of the individual documents into one before shipping it out to the client browser.

$ script/plugin install git://github.com/timcharper/bundle-fu.git

And then you simply wrap your sheet and script calls in the bundle method:

  <% bundle do %>
    ...
    <%= javascript_include_tag "prototype" %>
    <%= stylesheet_link_tag "basic.css" %>
    <%= calendar_date_select_includes "red" %>
    
    ...
  <% end %>

The Second plugin, which actually does compress all of your files, is sbecker’s asset_packager. This one is a lot more involved, so check out the github site for more information.

The following is a list of the available fields for both the Feed object itself and the Entries objects associated as articles in the channel.

FeedNormalizer::Feed

• title
• description
• id
• last_updated
• copyright
• authors / author
• urls / url
• image
• generator
• items / channel

FeedNormalizer::Entry

• content
• description
• title
• date_published
• urls / url
• id
• authors / author
• copyright
• categories

Etags

Etags and last_modified are crucial elements to sending proper request headers if you hope to receive conditional get responses and save yourself some overhead in feed processing. FeedNormalizer does not provide access to these elements as they are actually part of the http response headers, and not the feed itself.

While heavily studying the art of feed processing, I encountered Feezirra and Feedtosis, both excellent libraries for feed processing. My own application required a modified version of their concept, but there was a lot to learn in their code.

Feedtosis uses the HttpHeaders process to collect this information from a Curl::Easy object. I adapted the Feedtosis code to meet my needs like this:

require 'http_headers'

class Feed < ActiveRecord::Base
  def store_header_information
    headers = HttpHeaders.new(curl.header_str)
    self.response_code = curl.response_code
    self.etag = headers.etag unless headers.etag.nil?
    self.last_modified = headers.last_modified unless headers.last_modified.nil?
  end
end

rake ultrasphinx:configure

worked fine, but I encountered the following error upon attempting to index my models:

rake ultrasphinx:index
...
dyld: Library not loaded: /usr/local/mysql/lib/mysql/libmysqlclient.15.dylib
Referenced from: /usr/local/bin/indexer
Reason: image not found

In my configuration for development, I use the MAMP MySql server. The rake configure command correctly pulled all of the connection information from database.yml, so that was not the problem.

I searched around and finally encountered this solution from Michael Hartl:

$ sudo ln -s /usr/local/mysql/lib /usr/local/mysql/lib/mysql

It worked brilliantly. Thanks Michael.