Nest

Question

我想使用 NEST 编写查询，如下所述： https://www.elastic.co/guide/en/elasticsearch/reference/1.7/query-dsl-span-near-query.html

我有一组值用作 SpanTerm 子句。集合大小因查询而异。

如果集合大小有限我可以这样做：

var sn = q.SpanNear(snr => snr.Clauses(c => c.SpanTerm(), c => c.SpanTerm(), ...))

如何动态执行（未知子句算在内）？

Answer 1

您可以使用此扩展方法：

public static class SpanNearQueryDescriptorExtensions 
{
    public static void SpanTermClauses<T>(this SpanNearQueryDescriptor<T> descriptor, Expression<Func<T, object>> field, string[] terms)
        where T : class
    {
        descriptor.Clauses(terms
            .Select(t => new Func<SpanQuery<T>, SpanQuery<T>>(query => query.SpanTerm(field, t)))
            .ToArray());
    }
}

用法：

var terms = new[] {"term1", "term2"};

client.Search<Docuemnt>(s => s
    .Query(q => q
        .SpanNear(sp => sp
            .Slop(12)
            .SpanTermClauses(f => f.Title, terms))));

希望对您有所帮助。

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elasticsearch