load_schema

# File activerecord/lib/active_record/model_schema.rb, line 558
      def load_schema # :nodoc:
        return if schema_loaded?
        @load_schema_monitor.synchronize do
          return if @columns_hash

          load_schema!

          @schema_loaded = true
        rescue
          reload_schema_from_cache # If the schema loading failed half way through, we must reset the state.
          raise
        end
      end