嵌套DSL语法中的多个术语

问题描述

我正在尝试将以下查询转换为nesT DSL语法：

{
  "aggs": {
    "color": {
      "terms": {
        "field": "Color"
      }
    },"weight": {
      "terms": {
        "field": "Weight"
      }
    }
  }
}

每个术语都来自包含名称和fieldId的列表。到目前为止，我已经做到了：

  var request2 = _client.Search<T>(s => s
               .Aggregations(aggs =>
                   aggs.Terms("Weight",x => x.Field("Weight")).Terms("Color",x => x.Field("Weight"))));

这可以按预期工作，但是我需要能够动态提供参数Weight和Color，因为可以用不同的参数集调用该方法。有没有办法使用类似的东西：

aggs.Terms(x => x.field( myList.foreach(y.value))));

我猜想这与对象初始值设定项语法一起使用会更好，但是我宁愿在dsl中使用它。

解决方法

类似以下的方法会起作用

var client = new ElasticClient();

var fields = new List<string>
{
    "color","weight","foo","bar"
};

var response = client.Search<object>(s => s
    .Aggregations(aggs =>
    {
        foreach (var field in fields)
        {
            aggs.Terms(field,t => t.Field(field));
        }

        return aggs;
    })
);

它将生成以下请求

{
  "aggs": {
    "color": {
      "terms": {
        "field": "color"
      }
    },"weight": {
      "terms": {
        "field": "weight"
      }
    },"foo": {
      "terms": {
        "field": "foo"
      }
    },"bar": {
      "terms": {
        "field": "bar"
      }
    }
  }
}