Elasticsearch Nest 添加多个范围查询答案

【问题标题】：Elasticsearch Nest add multiple range queriesElasticsearch Nest 添加多个范围查询
【发布时间】：2016-05-31 23:35:30
【问题描述】：

我有一个dynamic 搜索描述符生成器。其中一个步骤是遍历范围过滤器列表并将其添加到搜索描述符中。但是，我添加的任何范围查询都会覆盖以前的范围查询。如何将范围查询附加到已添加的范围查询列表中

public SearchDescriptor<dynamic> FilterSearch(SearchDescriptor<dynamic> searchDescriptor, List<FilterField> filters)
{
    foreach (var filter in filters)
    {
        searchDescriptor = AddFilterToSearch(searchDescriptor, filter);
    }

    return searchDescriptor;
}

private static SearchDescriptor<dynamic> AddFilterToSearch(SearchDescriptor<dynamic> searchDescriptor, FilterField filter)
{
    var range = new RangeQuery
    {
        Field = filter.Field
    };
    var term = new TermQuery
    {
        Field = filter.Field
    };

    string rangeValue = filter.Value == null ? null : JsonConvert.ToString(filter.Value);

        // trim the quotes that JsonConvert wraps around the value for some reason
    if (rangeValue != null && rangeValue.StartsWith("\"") && rangeValue.EndsWith("\""))
        rangeValue = rangeValue.Substring(1, rangeValue.Length - 2);

    switch (filter.Operator)
    {
        case Enums.ComparrisonOperator.LowerThan:
            range.LowerThan = rangeValue;
            break;
        case Enums.ComparrisonOperator.LowerThanOrEqualTo:
            range.LowerThanOrEqualTo = rangeValue;
            break;
        case Enums.ComparrisonOperator.Equals:
            if (filter.Value != null && filter.Value is string)
                filter.Value = filter.Value.ToString().ToLowerInvariant();
            term.Value = filter.Value;
            break;
        case Enums.ComparrisonOperator.GreaterThan:
            range.GreaterThan = rangeValue;
            break;
        case Enums.ComparrisonOperator.GreaterThanOrEqualTo:
            range.GreaterThanOrEqualTo = rangeValue;
            break;
    }

    switch (filter.Operator)
    {
        case Enums.ComparrisonOperator.LowerThan:
        case Enums.ComparrisonOperator.LowerThanOrEqualTo:
        case Enums.ComparrisonOperator.GreaterThan:
        case Enums.ComparrisonOperator.GreaterThanOrEqualTo:
            searchDescriptor = searchDescriptor.Query(range);
            break;
        case Enums.ComparrisonOperator.Equals:
            searchDescriptor = searchDescriptor.Query(term);
            break;
    }

    return searchDescriptor;
}

【问题讨论】：

标签： c# elasticsearch nest

【解决方案1】：

如果您使用的是 NEST，我认为您应该使用 QueryContainer。

var result = _Instance.Search<Record>(s => s
              .Index("indexName")
              .Type("type")
              .Query(q =>
              {
                QueryContainer query = null;
                QueryContainer filter1 = null;
                QueryContainer filter2 = null;
                QueryContainer filter3 = null;

                query = q.QueryString(qs=>qs.OnFields(f => f.RecordValue).Query(term));

                filter1 = q.Filter(ff => ff.Range(n => n.OnField(f => f.minAge).Lower(20));
                filter2 = q.Filter(ff => ff.Range(n => n.OnField(f => f.minAge).Greater(20)); 
                filter3 = q.Filter(ff => ff.Range(n => n.OnField(f => f.maxAge).Lower(60));                   

                //You can put some conditions in here so you will
                switch (filter.Operator)
                {
                    case Enums.ComparrisonOperator.LowerThan:
                        return query && filter1;
                        break;
                    case Enums.ComparrisonOperator.GreaterThan:
                        return query && filter2;
                        break;
                }
              })
              .Take(10)
              );

或类似的东西....希望它有所帮助！当然...这是针对 Elasticsearch

【讨论】：