db/migrate/20150306023112_add_unique_index_to_namespace.rb


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class AddUniqueIndexToNamespace < ActiveRecord::Migration
  def change
    remove_index :namespaces, column: :name if index_exists?(:namespaces, :name)
    remove_index :namespaces, column: :path if index_exists?(:namespaces, :path)

    add_index :namespaces, :name, unique: true
    add_index :namespaces, :path, unique: true
  end
end