如何在 NEST 查询 Elasticsearch 中使用条件

Question

我想根据用户输入的 If Else 语句为 Elasticsearch 构建一个 NEST 查询。目前它只接受 must 部分中的一个条件，而另一个未添加到查询中。

以下代码编译到此 http 请求：

{"from":0,"query":{"bool":{"must":[{"nested":{"path":"customer","query":{"term":{"customer.customerId":{"value":1}}}}}]}},"size":10}

如您所见，SearchPersonId 未添加到 must 条件中。

搜索方式：

private ISearchResponse<Country> GetFilteredResults(ElasticClient client, Query query)
{
    var searchRequest = new SearchDescriptor<Country>();
    searchRequest.From(0).Size(10).Query(q =>
    {
        q.Bool(b => b
            .Must(mc =>
            {
                if (query.CustomerId != 0) mc.SearchCustomerId(query.CustomerId);
                if (query.PersonId != 0) mc.SearchPersonId(query.PersonId);
                
                return mc;
            })
        );

        return q;
    });

    return client.Search<Country>(searchRequest);
}

查询方式：

public static class Helpers
{
    public static QueryContainer SearchPersonId(this QueryContainerDescriptor<Country> container, string personId)
    {
        return container
            .Nested(n => n
                .Path(p => p.Person)
                .Query(q => q
                    .Term(t => t
                        .Field(f => f.Person.PersonId).Value(personId))));
    }

    public static QueryContainer SearchCustomerId(this QueryContainerDescriptor<Country> container, string customerId)
    {
        return container
            .Nested(n => n
                .Path(p => p.Customer)
                .Query(q => q
                    .Term(t => t
                        .Field(f => f.Customer.CustomerId).Value(customerId))));
    }
}

Answer 1

Must 方法的重载之一接受 QueryContainer 的数组，这可以帮助您实现条件逻辑

ISearchResponse<Country> GetFilteredResults(ElasticClient client, Query query)
{
    var queryContainers = new List<QueryContainer>();
    var descriptor = new QueryContainerDescriptor<Country>();
    if (query.CustomerId != 0) queryContainers.Add(descriptor.SearchCustomerId(query.CustomerId));
    if (query.PersonId != 0) queryContainers.Add(descriptor.SearchPersonId(query.PersonId));
    var searchRequest = new SearchDescriptor<Country>();
    searchRequest.From(0).Size(10).Query(q => q.Bool(b => b.Must(queryContainers.ToArray())));

    return client.Search<Country>(searchRequest);
}

如何在 NEST 查询 Elasticsearch 中使用条件

How to use Conditionals in NEST Queries Elasticsearch

.net

c#

elasticsearch

nest