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Commit 927d459d92e85daa5cd8c72f790c94fa64f1800a

Authored by Luke Baker
1 parent 6c7b80b0
Exists in master and in 1 other branch production-vendorized

add index to votes on created_at and question_id 

this is used for a query in the admin area that lists gets count of
votes by question for today
Showing 2 changed files with 13 additions and 1 deletions   Show diff stats
db/migrate/20110628160608_add_index_for_created_at_question_id_to_votes.rb 0 → 100644
  Diff comments   View file @927d459
... ... @@ -0,0 +1,11 @@
  1 +class AddIndexForCreatedAtQuestionIdToVotes < ActiveRecord::Migration
  2 + # this is for a query in the admin area
  3 + # EXPLAIN SELECT count(*) AS count_all, votes.question_id AS votes_question_id FROM `votes` INNER JOIN `questions` ON `questions`.id = `votes`.question_id WHERE (votes.created_at > '2011-06-01') AND (votes.valid_record = 1) GROUP BY votes.question_id;
  4 + def self.up
  5 + add_index :votes, [:created_at, :question_id]
  6 + end
  7 +
  8 + def self.down
  9 + remove_index :votes, [:created_at, :question_id]
  10 + end
  11 +end
... ...
db/schema.rb
  Diff comments   View file @927d459
... ... @@ -9,7 +9,7 @@
9 9 #
10 10 # It's strongly recommended to check this file into your version control system.
11 11  
12   -ActiveRecord::Schema.define(:version => 20110620185325) do
  12 +ActiveRecord::Schema.define(:version => 20110628160608) do
13 13  
14 14 create_table "appearances", :force => true do |t|
15 15 t.integer "voter_id"
... ... @@ -250,6 +250,7 @@ ActiveRecord::Schema.define(:version =&gt; 20110620185325) do
250 250 end
251 251  
252 252 add_index "votes", ["choice_id"], :name => "choice_id_idx"
  253 + add_index "votes", ["created_at", "question_id"], :name => "index_votes_on_created_at_and_question_id"
253 254 add_index "votes", ["loser_choice_id"], :name => "loser_choice_id_idx"
254 255 add_index "votes", ["question_id"], :name => "question_id_idx"
255 256 add_index "votes", ["voter_id"], :name => "index_votes_on_voter_id"
... ...