c# - 利用NEST for ES FunctionScore具有可变数量的功能

Question

利用NEST的0.12版本，我需要通过功能评分API来建立支持，以便在我的C#应用程序中具有可变数量的功能参数，例如下面定义的。基于API的当前形状，我无法找到有条件地添加函数或将函数项的原始数组传递给查询描述符对象的方法。在0.12中是否有其他方法可以实现这一目标？

bool useFunctionScoreForCreatedDate = true;
bool useFunctionScoreForAge = true;

var s = new SearchDescriptor<ExampleDataObject>().From(0).Size(10)
  .Query(aa => aa
   .FunctionScore(fs => fs
       .Query(qq => qq.MatchAll())
       .Functions(
        // need to conditionally add this function score to the FunctionScoreFunction[] if useFunctionScoreForCreatedDate
        f => f.Linear(x => x.createddate, d => d.Scale("0d")),
       // need to conditionally add this function score to the FunctionScoreFunction[] if useFunctionScoreForAge
        f => f.Exp(x => x.age, d => d.Scale("0.5")),
        f => f.BoostFactor(2)
       )
      .ScoreMode(FunctionScoreMode.sum)
     )
).Fields(x => x.title);

Answer 1

看起来.Functions()的.FunctionScore()方法接受了FunctionScoreFunctionsDescriptor<>对象。因此，您应该可以使用类似于以下内容的内容...

 bool useFunctionScoreForCreatedDate = true;
 bool useFunctionScoreForAge = true;

 var fsFunctionsDescriptor = new FunctionScoreFunctionsDescriptor<ExampleDataObject();
 if (useFunctionsScoreForCreatedDate)
 {
      fsFunctionsDescriptor.Linear(x => x.createdate, d => d.Scale("0d"));
 }

 if (useFunctionScoreForAge) 
 {
      fsFunctionsDescriptor.Exp( x => x.age, d => d.Scale("0.5"));
 }
 fsFunctionsDescriptor.BoostFactor(2);

 var s = new SearchDescriptor<ExampleDataObject>().From(0).Size(10)
   .Query(aa => aa
   .FunctionScore(fs => fs
       .Query(qq => qq.MatchAll())
       .Functions(fsFunctionsDescriptor)
       .ScoreMode(FunctionScoreMode.sum)
     )
 ).Fields(x => x.title);