Created
October 25, 2013 17:33
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ActiveRecord で MySQL のインデックスを指定して取得したい ref: http://qiita.com/eccyan/items/0641af416e6f9330f1e9
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| scope :use_index, lambda { |*indexes| | |
| from("#{self.table_name} USE INDEX(#{indexes.join(', ')})") | |
| } |
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| Question.use_index(:index_questions_on_id).page.total_count | |
| # (82.5ms) SELECT COUNT(*) FROM questions USE INDEX(index_questions_on_id) | |
| # => 193887 |
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