{ "rules_copy_album_tags" : {
    "LABEL" : "Copy Album tags",
    "PLUGIN" : "reaction rule",
    "REQUIRES" : [ "rules" ],
    "ON" : [ "node_presave" ],
    "IF" : [
      { "entity_has_field" : { "entity" : [ "node" ], "field" : "field_album_fields" } },
      { "entity_has_field" : { "entity" : [ "node" ], "field" : "field_tags" } }
    ],
    "DO" : [
      { "LOOP" : {
          "USING" : { "list" : [ "node:field-album-fields" ] },
          "ITEM" : { "field" : "Field" },
          "DO" : [
            { "LOOP" : {
                "USING" : { "list" : [ "field:field-tags" ] },
                "ITEM" : { "tag" : "tag" },
                "DO" : [
                  { "list_add" : { "list" : [ "node:field-tags" ], "item" : [ "tag" ], "unique" : 1 } }
                ]
              }
            }
          ]
        }
      }
    ]
  }
}