Question

我有一个方法，将查询作为参数，如：

public ISearchResponse<Object> SearchComponent(SearchDescriptor<Object> query)
{
...
}

在此查询中，我想添加一个源过滤器，如：

public ISearchResponse<Object> SearchComponent(SearchDescriptor<Object> query)
{
query = query.Source(sf =>
                    sf.Exclude(e => e
                        .Field("SomeField")
                        ));
...
}

但是如果查询已经有源过滤器会发生什么？这个过滤器会覆盖那个过滤器吗？如何更新现有查询源过滤器？

Answer 1

这似乎有效，但它并不是最美丽的解决方案。任何人都可以提出更好的选择吗？

public ISearchResponse<Object> SearchComponent(ISearchRequest query)
{
    var excludeFields = new List<string>();
    excludeFields.Add("SomeField");

    if (query.Source == null)
    {
        query.Source = new SourceFilter {Include = "*", Exclude = excludeFields.ToArray()};
    }
    else if (query.Source.Exclude == null)
    {
        query.Source.Exclude = excludeFields.ToArray();
    }
    else
    {
        query.Source.Exclude.And(excludeFields.ToArray());
    }
    ...
}

Answer 2

You are using an older version of Nest than what I have and this has changed a bit, but I figure you can do something along these lines:

var exclude = query.Source?.Exclude; 
query.Source = new SourceFilter() { Excludes =  (exclude ?? new Field[0]).Union(moreFields) };

NEST：更新源过滤器

2 个答案: