rails 3 search plugin

  gem "meta_search"

http://metautonomo.us/2010/03/07/metasearch-object-based-searching-for-rails-3/

this is good

http://metautonomo.us/projects/metawhere/

Debug your SQL with debug_sql
The to_sql method is a handy way to show your query, but as I’ve written about before,
 it has its shortcomings. When your query is going to eager load some 
records and has conditions referencing the eager loaded tables, 
ActiveRecord changes its generated query, but to_sql is none the wiser. 
Enter debug_sql:


ruby-1.9.2-head > Article.includes(:comments).where(:comments => {:body => 'hey'}).to_sql
 => SELECT "articles".* FROM "articles" WHERE ("comments"."body" = 'hey')
#
# LIES!!!
#
ruby-1.9.2-head > Article.includes(:comments).where(:comments => {:body => 'hey'}).debug_sql
 => SELECT "articles"."id" AS t0_r0, "articles"."title" AS t0_r1,
           "articles"."body" AS t0_r2, "articles"."created_at" AS t0_r3,
           "articles"."updated_at" AS t0_r4, "articles"."lookup_id" AS t0_r5,
           "comments"."id" AS t1_r0, "comments"."article_id" AS t1_r1,
           "comments"."body" AS t1_r2, "comments"."created_at" AS t1_r3,
           "comments"."updated_at" AS t1_r4
    FROM   "articles" LEFT OUTER JOIN "comments"
           ON "comments"."article_id" = "articles"."id"
    WHERE  ("comments"."body" = 'hey')
# The (ugly) truth!


强大的Rails查询、搜索插件：SearchLogic
这个似乎更好
http://yuan.javaeye.com/blog/648869
this is a tutorial
http://asciicasts.com/episodes/176-searchlogic
search logic不支持rails3
https://github.com/railsdog/searchlogic.git
上面这个好像是别人修改的版本，
https://github.com/railsdog/searchlogic
问题
http://stackoverflow.com/questions/4023087/could-not-find-gem-error-when-specifying-a-forked-version-of-a-gem-from-github
insalll
gem 'rd_searchlogic', :require => 'searchlogic', :git => 'git://github.com/railsdog/searchlogic.git'
http://stackoverflow.com/questions/4310120/rails-3-meta-search-usage