action_sql

# File activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb, line 137
          def action_sql(action, dependency)
            case dependency
            when :nullify then "ON #{action} SET NULL"
            when :cascade  then "ON #{action} CASCADE"
            when :restrict then "ON #{action} RESTRICT"
            else
              raise ArgumentError, <<~MSG
                '#{dependency}' is not supported for :on_update or :on_delete.
                Supported values are: :nullify, :cascade, :restrict
              MSG
            end
          end
      end