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PERF: reverse index on topic users to speed up join

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Sam 2014-09-10 23:03:59 +10:00
parent ca2100d012
commit af75360942
1 changed files with 6 additions and 0 deletions
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db/migrate/20140910130155_create_topic_user_index.rb Normal file
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class CreateTopicUserIndex < ActiveRecord::Migration
def change
# seems to be the most effective for joining into topics
add_index :topic_users, [:user_id, :topic_id], unique: true
end
end