2007/07/14 links

ActiveRecord::Extensions:
http://arext.rubyforge.org/
http://www.continuousthinking.com/tags/arext/rdoc/index.html
http://www.rubyinside.com/advent2006/17-extendingar.html
http://www.continuousthinking.com/tags/arext

引用

ActiveRecord does alot for you, but it can do more, alot more.

ActiveRecord::Extensions extends ActiveRecord... for you. It gives you features that ActiveRecord itself doesn't give, like:

    * Better finder support with more robust Hashes
    * Better finder support with to_sql custom query objects
    * Mass data imports
    * A more modular design for core components of ActiveRecord

class Post < ActiveRecord::Base ; end

Post.find( :all, :conditions=>{ 
  :title => "Title",                           # title='Title'
  :author_contains => "Zach",                  # author like '%Zach%'
  :author_starts_with => "Zach",               # author like 'Zach%'
  :author_ends_with => "Dennis",               # author like '%Zach'
  :published_at => (Date.now-30 .. Date.now),  # published_at BETWEEN xxx AND xxx
  :rating => [ 4, 5, 6 ],                      # rating IN ( 4, 5, 6 )
  :rating_not_in => [ 7, 8, 9 ]                # rating NOT IN( 4, 5, 6 )
  :rating_ne => 4,                             # rating != 4
  :rating_gt => 4,                             # rating > 4
  :rating_lt => 4,                             # rating < 4
  :content => /(a|b|c)/                        # REGEXP '(a|b|c)'
)

# These examples are given for the MySQL adapter. Other adapters are
# are supported, please refer to the ActiveRecord::Extensions 
# documentation for more information.