基于嵌套属性的RavenDB索引查询

Question

sssI目前有一个名为SchoolMetrics的索引，它将School字段上的几个字段聚合为键，并生成如下所示的文档:

{ 
    School: {
      SchoolId: 1234
      Name: "asdf"
    }
    StudentCount: 1234,
    CourseCount: 1234
 }

我的索引地图定义为:

from s in docs.Metrics
where s.School != null
select new
{
    s.School,
    s.StudentCount,
    s.CourseCount
}

， reduce为:

from s in results
group s by s.School
into g
select new
{
    School= g.Key,
    StudentCount = g.Sum(x => x.StudentCount),
    CourseCount = g.Sum(x => x.CourseCount)
}

当我尝试做这样的查询时:http://localhost: 8080/数据库/数据库/索引/SchoolMetrics ? = School.SchoolId查询:1234

它给了我这个错误:

 "System.ArgumentException: The field 'School.SchoolId' is not indexed, cannot query on fields that are not indexed
   at Raven.Database.Indexing.Index.IndexQueryOperation.AssertQueryDoesNotContainFieldsThatAreNotIndexes() in c:BuildsravenRaven.DatabaseIndexingIndex.cs:line 639
   at Raven.Database.Indexing.Index.IndexQueryOperation.<Query>d__24.MoveNext() in c:BuildsravenRaven.DatabaseIndexingIndex.cs:line 558
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection)
   at Raven.Database.DocumentDatabase.<>c__DisplayClass70.<Query>b__68(IStorageActionsAccessor actions) in c:BuildsravenRaven.DatabaseDocumentDatabase.cs:line 705
   at Raven.Storage.Esent.TransactionalStorage.ExecuteBatch(Action`1 action) in c:BuildsravenRaven.Storage.EsentTransactionalStorage.cs:line 378
   at Raven.Storage.Esent.TransactionalStorage.Batch(Action`1 action) in c:BuildsravenRaven.Storage.EsentTransactionalStorage.cs:line 341
   at Raven.Database.DocumentDatabase.Query(String index, IndexQuery query) in c:BuildsravenRaven.DatabaseDocumentDatabase.cs:line 652
   at Raven.Database.Server.Responders.Index.PerformQueryAgainstExistingIndex(IHttpContext context, String index, IndexQuery indexQuery, Guid& indexEtag) in c:BuildsravenRaven.DatabaseServerRespondersIndex.cs:line 150
   at Raven.Database.Server.Responders.Index.ExecuteQuery(IHttpContext context, String index, Guid& indexEtag) in c:BuildsravenRaven.DatabaseServerRespondersIndex.cs:line 136
   at Raven.Database.Server.Responders.Index.GetIndexQueryRessult(IHttpContext context, String index) in c:BuildsravenRaven.DatabaseServerRespondersIndex.cs:line 92
   at Raven.Database.Server.Responders.Index.OnGet(IHttpContext context, String index) in c:BuildsravenRaven.DatabaseServerRespondersIndex.cs:line 84
   at Raven.Database.Server.Responders.Index.Respond(IHttpContext context) in c:BuildsravenRaven.DatabaseServerRespondersIndex.cs:line 46
   at Raven.Http.HttpServer.DispatchRequest(IHttpContext ctx) in c:BuildsravenRaven.HttpHttpServer.cs:line 399
   at Raven.Http.HttpServer.HandleActualRequest(IHttpContext ctx) in c:BuildsravenRaven.HttpHttpServer.cs:line 222"

更奇怪的是，当我尝试查询StudentCount或CourseCount字段它的工作原理…我试过在学校里装个分析仪。学校id字段，但这似乎没有帮助…我也试过把结果文档弄平，也得到了同样的错误。我错过什么了吗?

Answer 1

除了Thomas的注释之外，您必须理解我们将索引的最终输出视为索引项。如果你要索引一个复杂的对象，它将被索引为Json值，而不是你可以进一步查询的东西

Answer 2

按School对象分组。指数扁平化怎么样?

from s in docs.Metrics
where s.School != null
select new
{
    SchoolId = s.School.SchoolId,
    s.StudentCount,
    s.CourseCount
}
from s in results
group s by s.SchoolId
into g
select new
{
    SchoolId = g.Key,
    StudentCount = g.Sum(x => x.StudentCount),
    CourseCount = g.Sum(x => x.CourseCount)
}