add index for content_tags learning_outcome_id

This is a common query in learning outcomes code, and was totally unindexed Change-Id: I37b96cbaf62235a08a51ba6abce3ee1d7c17a271 Reviewed-on: https://gerrit.instructure.com/18401 Reviewed-by: Cody Cutrer <[email protected]> Tested-by: Jenkins <[email protected]> QA-Review: Brian Palmer <[email protected]>
dejitaiza · Mar 8, 2013 · a8df381 · a8df381
1 parent 7e10d61
commit a8df381
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/db/migrate/20130307214055_add_index_to_content_tags_learning_outcome_id.rb b/db/migrate/20130307214055_add_index_to_content_tags_learning_outcome_id.rb
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+class AddIndexToContentTagsLearningOutcomeId < ActiveRecord::Migration
+  tag :predeploy
+  self.transactional = false
+
+  def self.up
+    add_index :content_tags, :learning_outcome_id, :concurrently => true, :conditions => "learning_outcome_id IS NOT NULL"
+  end
+
+  def self.down
+    remove_index :content_tags, :column => :learning_outcome_id
+  end
+end