instance method check_current_protected_environment!

# File activerecord/lib/active_record/tasks/database_tasks.rb, line 626
        def check_current_protected_environment!(db_config)
          with_temporary_pool(db_config) do |pool|
            connection = pool.connection
            current = connection.migration_context.current_environment
            stored  = connection.migration_context.last_stored_environment

            if connection.migration_context.protected_environment?
              raise ActiveRecord::ProtectedEnvironmentError.new(stored)
            end

            if stored && stored != current
              raise ActiveRecord::EnvironmentMismatchError.new(current: current, stored: stored)
            end
          rescue ActiveRecord::NoDatabaseError
          end
        end