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The benefit of having the ApplicationMailer is that you can define the host for the mailers, include ActionController::UrlWriter, other setup methods in a single file and have all the mailers inherit them.

The patch written for action mailer to not use layouts for text/plain email was causing problem with exception notification plugin, so I have modified it slightly so that it checks whether the file parameter passed to it responds to content_type or not.

Further to clean things up this patch can be moved to ApplicationMailer to ensure that it is only applied for all our mailers and not for other mailers which may be used elsewhere.

1. Make sure that your page urls are descriptive. For example look at the post urls of this page. They are of the form http://blog.kreeti.com/seo/simple-search-engine-optimization-steps. This is very easy to do in rails. Add the following code to the models:
   1. def to_param
   2.     "#{id}-#{name.gsub(/[^a-z0-9]+/i, ‘-’)}"
   3. end

   and then while linking to posts, use code like

   1. user_path(@user)

   and not

   1. user_path(@user.id) # do not use this
2. Ensure that your pages have a meaningful page title, meta description and meta keywords. Title and description should be preferably unique for each page, and relevant to the page. One simple strategy which you can follow to do this in rails is, in the layout file add the following code:
   1. <title><%= @page_title || "Default page title" %></title>

   and similarly for meta description and keywords.

   Then in your actions you can override the default values

   1. @page_title = "New title"
   2. @page_description = "new description"
   3. @meta_keywords = "keyword1,keyword2,.."
3. Make sure that all links to meaningless and duplicate pages have rel=”nofollow”. For example, pagination links, links which just sort the page content in a different order, etc., all should have rel=”nofollow” for them. This will ensure that the search engines, when propagating the authority of your page to other linked pages, doesn’t waste them on useless pages, or duplicate links.
4. When multiple items on a page are linking to the same page, make sure that all the links with irrelevant terms have rel=”nofollow”, only the links with terms which aptly describe the page shouldn’t have rel=”nofollow”.
5. Duplicate versions of your page, say with a different sort order, example a link like /users/recipes?order=created_at, should have
   1. <meta name="robots" content="noindex, noarchive" />

   in their head element.

6. Your stylesheets, javascript files, images used for styling purposes, non-important pages like sign in, join, privacy policy, terms, should all not be indexed. To ensure this, create a robots.txt file like the following

   # See http://www.robotstxt.org/wc/norobots.html for documentation on how to use the robots.txt file
   User-Agent: *
   Disallow: /account
   Disallow: /session
   Disallow: /images/
   Disallow: /stylesheets/
   Disallow: /javascripts/
   Disallow: /flash/
   Disallow: /opensearch.xml
   Disallow: /404.html
   Disallow: /500.html
   
   Allow: /

Sign up for Google Webmaster and Yahoo Site Explorer, and add your sites to them, and authenticate that your are the owner of it. Both tools provide very valuable information in optimizing a site for search engines.

Also, the introduction of database connection pools breaks the spawn plugin. So, switch to the latest release of that as well.

Enhanced migrations plugin uses the table migrations_info to store the migrations information but rails 2.2 uses the table schema_migrations by default. When one does rake db:migrate, the rails code checks whether the schema_migrations table exists or not, if the table is not there, then it is created, and if the schema_info table is present, then this table is populated with all migrations upto the version in the schema_info table. But, since we were using the enhanced migrations plugin, the table schema_info was present but wasn’t being used.

So, to make the switch to rails 2.2.* timestamped migrations before doing regular rake db:migrate the following sql code had to be run, to ensure that schema_migrations table is pre-created, and has the correct list of all migrations which have been run.

create table schema_migrations (version varchar(255) not null primary key);
INSERT INTO schema_migrations select id from migrations_info;
drop table if exists schema_info;

Rails 2.2 has added a very cool new feature which allows the use of layouts for mailer-templates, just like the way layouts can be used for views. This is great, but there is one gotcha, when you try sending a multi-part email (both text and html, as you should be), it wraps the mail content with the same layout for both the text/plain version and the text/html version.

After digging around a bit in the ActionMailer code, I came up with the following monkey patch, which will use the layout only for the text/html version of the email. You can put this code in your environment.rb file, it won’t use layout when the mail-template content type is ‘text/plain’.

If you can come up with some other better solution than this, then let us know.