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Update migration to handle duplicate likes

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This commit is contained in:
Raphael Sofaer 2011-07-09 17:27:25 -07:00
parent 67882c775e
commit a7d8535d36
1 changed files with 11 additions and 0 deletions
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11
db/migrate/20110707234802_likes_on_comments.rb
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@ -1,4 +1,5 @@
class LikesOnComments < ActiveRecord::Migration
class Likes < ActiveRecord::Base; end
def self.up
remove_foreign_key :likes, :posts
@ -11,7 +12,17 @@ class LikesOnComments < ActiveRecord::Migration
UPDATE likes
SET target_type = 'Post'
SQL
execute <<SQL
UPDATE posts
SET likes_count = (SELECT COUNT(*) FROM likes WHERE likes.target_id = posts.id AND likes.target_type = 'Post')
SQL
#There are some duplicate likes.
keeper_likes = Like.group(:target_id, :author_id, :target_type).having('COUNT(*) > 1')
keeper_likes.each do |like|
l = Like.arel_table
Like.where(:target_id => like.target_id, :author_id => like.author_id, :target_type => like.target_type).where(l[:id].not_eq(like.id)).delete_all
end
add_index :likes, [:target_id, :author_id, :target_type], :unique => true
end