Comments on: Complex SQL Sorts with Rails/ActiveRecord http://gurge.com/blog/2006/11/18/complex-sql-sorts-with-railsactiverecord/ Fri, 29 Aug 2008 05:56:28 +0000 http://wordpress.org/?v=2.3.3 By: Sudden http://gurge.com/blog/2006/11/18/complex-sql-sorts-with-railsactiverecord/#comment-16982 Sudden Sat, 20 Oct 2007 13:56:20 +0000 http://gurge.com/blog/2006/11/18/complex-sql-sorts-with-railsactiverecord/#comment-16982 :group => "'a'" (String 'a') makes sure, that all found rows are grouped together :group => “‘a’” (String ‘a’) makes sure, that all found rows are grouped together

]]> By: Sudden http://gurge.com/blog/2006/11/18/complex-sql-sorts-with-railsactiverecord/#comment-16981 Sudden Sat, 20 Oct 2007 13:54:57 +0000 http://gurge.com/blog/2006/11/18/complex-sql-sorts-with-railsactiverecord/#comment-16981 Try r = Restaurant.find(:all, :select => 'group_concat(id) as ids', :group => "'a'", :order => :popularity, :limit => 100) to get the already comma-separated ID-list returned by the mysql-server. r[:ids] then contains that string. You need to make sure mysqls group_concat_max_len is large enough. Try

r = Restaurant.find(:all,
:select => ‘group_concat(id) as ids’,
:group => “‘a’”,
:order => :popularity,
:limit => 100)

to get the already comma-separated ID-list returned by the mysql-server.
r[:ids] then contains that string.

You need to make sure mysqls group_concat_max_len is large enough.

]]> By: Arrix http://gurge.com/blog/2006/11/18/complex-sql-sorts-with-railsactiverecord/#comment-4521 Arrix Sun, 29 Apr 2007 03:53:45 +0000 http://gurge.com/blog/2006/11/18/complex-sql-sorts-with-railsactiverecord/#comment-4521 You may want to use select_values() so that you don't need to map. You may want to use select_values() so that you don’t need to map.

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