Rails 1.2 Depricated
Thanks to Rubyonrails.org
Also checkout
Action Pack:
components use partials and helper methods instead @params, @session, @flash, @request, @cookies, @headers, @response
Use the params, session, flash, etc methods instead of working with the instance variables directly. url_for(:symbol, args), redirect_to(:symbol, *args)
use named routes instead
render_text, render_template, etc. use e.g. render :text => ..., render :template => ..., etc.
redirect_to_path, redirect_to_url. Use redirect_to.
post_format, formatted_post?, xml_post?, yaml_post? Use respond_to or request.format.
start_form_tag and end_form_tag Use form_tag with a block.
update_element_function use RJS
link_to_image, link_image_to helper methods use link_to(image_tag(..), url)
human_size helper alias use number_to_human_size helper method
Active Record:
find_first, find_all Use find :first and find :all. push_with_attributes Use has_many :through for rich many-to-many associations. *association_count Use association.count instead
Railties:
Non-namespaced rake tasks like rake migrate. Use rake db:migrate.