discourse/db/migrate/20160302063432_rebuild_dire...

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class RebuildDirectoryItemWithIndex < ActiveRecord::Migration
def up
remove_index :directory_items, [:period_type]
execute "TRUNCATE TABLE directory_items RESTART IDENTITY"
add_index :directory_items, [:period_type, :user_id], unique: true
end
def down
remove_index :directory_items, [:period_type, :user_id]
add_index :directory_items, [:period_type]
end
end