我进行了有效的搜索,设置了构面范围,并获得了正确的结果。问题是,对于价格方面,我需要取决于返回的结果,因此我无法事先知道范围。
示例1:搜索找到了以下价格的4种产品:20、30、40、55。因此,我希望这些方面是这样的:
0 - 20 (1)
21 - 40 (2)
41 - 60 (1)
示例2:搜索找到2个具有以下价格的产品:200、400,所以我希望这些方面是这样的:
100 - 200 (1)
300 - 400 (1)
在Lucene的某个地方,我可以指定我希望范围基于搜索结果中的字段吗?
谢谢
经过许多搜索,我没有找到一种开箱即用的方法。做到这一点的方法是扩展DrillSideways
,在BuildFacetsResult
方法的开始,我们提取具有必要值的字段。像这样的东西:
public class DrillSidewaysHelper : DrillSideways
{
private TopFieldCollector _localCollector;
private List<decimal> _prices;
protected override LuceneFacets BuildFacetsResult(FacetsCollector drillDownCollector, FacetsCollector[] drillSidewaysCollectors,
string[] drillSidewaysFacets)
{
ExtractResults(); //here we extract the methods from the _localCollector and populate _prices
....here we can generate the facets range based on the _prices
}
public FacetResultSet<T> OurSearch(DrillDownQuery drillDownQuery, Sort sort)
{
int limit = m_searcher.IndexReader.MaxDoc;
_localCollector = TopFieldCollector.Create(sort, limit, null, true, true, false, true);
var drillSidewaysResult = Search(drillDownQuery, _localCollector);
var facets = ExtractFacets(drillSidewaysResult.Facets);
return new FacetResultSet<T>(_results, (uint) _localCollector.TotalHits, facets);
}
}
和用法:
var drillSideways = new DrillSidewaysHelper(searcher, facetsConfig, taxonomyReader);
return drillSideways.OurSearch(drillDownQuery, sort);