data_source_exists?

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 47
      def data_source_exists?(name)
        prepare_data_sources if @data_sources.empty?
        return @data_sources[name] if @data_sources.key? name

        @data_sources[name] = connection.data_source_exists?(name)
      end