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Added helper(:all) as a way to include all helpers from app/helpers/**/*.rb in ApplicationController [DHH]

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Added config/initializers where all ruby files within it are automatically loaded after the Rails configuration is done, so you don't have to litter the environment.rb file with a ton of mixed stuff [DHH]

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Added database connection as a yield parameter to ActiveRecord::Base.transaction so you can manually rollback [DHH]

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Introduce a cookie-based session store as the Rails default. Sessions typically contain at most a user_id and flash message; both fit within the 4K cookie size limit. A secure hash is included with the cookie to ensure data integrity (a user cannot alter his user_id without knowing the secret key included in the hash). If you have more than 4K of session data or don't want your data to be visible to the user, pick another session store. Cookie-based sessions are dramatically faster than the alternatives.

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You can now use cache in instance hierachies. This allows ActiveRecord::Base.cache { } usage to cache everything


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Added .erb and .builder as preferred aliases to the now deprecated .rhtml and .rxml extensions [Chad Fowler]. This is done to separate the renderer from the mime type. .erb templates are often used to render emails, atom, csv, whatever. So labeling them .rhtml doesn't make too much sense. The same goes for .rxml, which can be used to build everything from HTML to Atom to whatever. .rhtml and .rxml will continue to work until Rails 3.0, though. So this is a slow phasing out. All generators and examples will start using the new aliases, though.

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Set cache-control to private if theres an etag available (and the cache-control hasnt been overwritten already)

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Added caching option to AssetTagHelper#stylesheet_link_tag and AssetTagHelper#javascript_include_tag [DHH]

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Add request protocol to asset host if not given. Prefer setting asset host as hostname only, no request protocol.

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Work around the two connection per host browser limit: use asset%d.myapp.com to distribute asset requests among asset[0123].myapp.com. Use a DNS wildcard or CNAMEs to map these hosts to your asset server. See http://www.die.net/musings/page_load_time/ for background.

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