discourse/db/migrate/20200117141138_update_post_...

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# frozen_string_literal: true
class UpdatePostReplyIndexes < ActiveRecord::Migration[6.0]
# Adding and removing indexes concurrently doesn't work within transaction.
# It also needs existence checks for indexes in case the migration fails and needs to run again.
disable_ddl_transaction!
def up
if !index_exists?(:post_replies, [:post_id, :reply_post_id])
add_index :post_replies, [:post_id, :reply_post_id], unique: true, algorithm: :concurrently
end
if !index_exists?(:post_replies, [:reply_post_id])
add_index :post_replies, [:reply_post_id], algorithm: :concurrently
end
if index_exists?(:post_replies, [:post_id, :reply_id])
remove_index :post_replies, column: [:post_id, :reply_id], algorithm: :concurrently
end
if index_exists?(:post_replies, [:reply_id])
remove_index :post_replies, column: [:reply_id], algorithm: :concurrently
end
end
def down
raise ActiveRecord::IrreversibleMigration
end
end