BreezeJS - 出口和进口问题

Question

我正在努力成为“沙盒编辑器”

function getClonedWorkItem(entityType, entityId) {
        var clonedManager = entityManager.createEmptyCopy();
        var oentity = entityManager.getEntityByKey(_mapEntityTypeToSingleType(entityType), entityId);

        //export it to the new manager
        var exportData = entityManager.exportEntities([oentity], true);
        clonedManager.importEntities(exportData);

        var cloned = clonedManager.getEntityByKey(_mapEntityTypeToSingleType(entityType), entityId);

        return {
            entity: cloned,
            __context: clonedManager
        };
    }

问题是克隆的项目在方面下没有extrametadata，所以我无法将其发送到服务器进行更新 - 因为它失败了

function updateDeleteMergeRequest(request, aspect, prefix) {
    var extraMetadata = aspect.extraMetadata;
    var uri = extraMetadata.uri || extraMetadata.id;
    if (__stringStartsWith(uri, prefix)) {
        uri = uri.substring(prefix.length);
    }
    request.requestUri = uri;
    if (extraMetadata.etag) {
        request.headers["If-Match"] = extraMetadata.etag;
    }
}