在Titan图形数据库中使用List基数更新顶点属性的整个值

我将更新列表属性的整个值，并为Titan 1.0中的值设置一个新值，对于单基数，我可以使用vertex.property("single_property",new_value)，并覆盖整个值，但是对于类型为List的基数，新值将被添加到属性中(不会覆盖整个值).而且，如果我删除该属性并添加一个新值，那么在同一笔交易中，Titan似乎将忽略整个操作！因此，我的问题是如何以适当的方式更新list属性的整个值?

I am going to update entire value of list property and set a new value for that in Titan 1.0, for single cardinality I can use vertex.property("single_property",new_value) ,and overwrite the whole value but for the cardinality of type List, the new value will be added to the property (it will not overwrite the whole value). Moreover, if I remove the property and add a new value, in the same transaction it seems that the whole operation will be ignored by Titan! Therefore, my question would be how can I update the whole value of list property in an appropriate way?

关于phani提供的解决方案，以下代码对我不起作用，插入部分起作用，而删除部分无效.

Regarding the solution provided by phani, the following code did not work for me, the insertion part worked, but the deletion part did not.

keywords = keywordExtractor.getKeywords(getId(nextVertex))
if (keywords.size() > 0) {
     nextVertex.property(VertexProperty.Cardinality.single, "post_keyword", keywords.get(0));
     keywords.remove(0);
            for (String keyword : keywords) {
                    nextVertex.property(VertexProperty.Cardinality.list, "post_keyword", keyword);
            }
}
nextVertex.graph().tx().commit();

下面提供的Jason提供的解决方案也不起作用.问题出在删除部分.

Also the solution provide by Jason which is provided in the following did not work either. The problem was in the deletion part.

    keywords = keywordExtractor.getKeywords(getId(nextVertex))
    if (keywords.size() > 0) {
         nextVertex.graph().traversal().V(nextVertex).properties("post_keyword").drop().iterate();
                for (String keyword : keywords) {
                        nextVertex.property("post_keyword", keyword);
                }
    }
    nextVertex.graph().tx().commit();

我也研究了以下解决方案；也不起作用.

I also did investigate the following solution; did not work either.

    keywords = keywordExtractor.getKeywords(getId(nextVertex))
    if (keywords.size() > 0) {
        Iterator<VertexProperty<Object>> iter = nextVertex.properties("post_keyword");
        while(iter.hasNext()){
                iter.next().remove();
        }
        for (String keyword : keywords) {
                nextVertex.property("post_keyword", keyword);
        }
    }
    nextVertex.graph().tx().commit();