RavenDB 嵌套属性索引查询

Question

sss我目前有一个名为 SchoolMetrics 的索引，它聚合了 School 字段上的多个字段作为键并生成如下文档：

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

我的索引映射定义为：

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

减少为：

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)
}

当我尝试执行如下查询时： http://localhost:8080/databases/Database/indexes/SchoolMetrics ?query=School.SchoolId: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:\Builds\raven\Raven.Database\Indexing\Index.cs:line 639
   at Raven.Database.Indexing.Index.IndexQueryOperation.<Query>d__24.MoveNext() in c:\Builds\raven\Raven.Database\Indexing\Index.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:\Builds\raven\Raven.Database\DocumentDatabase.cs:line 705
   at Raven.Storage.Esent.TransactionalStorage.ExecuteBatch(Action`1 action) in c:\Builds\raven\Raven.Storage.Esent\TransactionalStorage.cs:line 378
   at Raven.Storage.Esent.TransactionalStorage.Batch(Action`1 action) in c:\Builds\raven\Raven.Storage.Esent\TransactionalStorage.cs:line 341
   at Raven.Database.DocumentDatabase.Query(String index, IndexQuery query) in c:\Builds\raven\Raven.Database\DocumentDatabase.cs:line 652
   at Raven.Database.Server.Responders.Index.PerformQueryAgainstExistingIndex(IHttpContext context, String index, IndexQuery indexQuery, Guid& indexEtag) in c:\Builds\raven\Raven.Database\Server\Responders\Index.cs:line 150
   at Raven.Database.Server.Responders.Index.ExecuteQuery(IHttpContext context, String index, Guid& indexEtag) in c:\Builds\raven\Raven.Database\Server\Responders\Index.cs:line 136
   at Raven.Database.Server.Responders.Index.GetIndexQueryRessult(IHttpContext context, String index) in c:\Builds\raven\Raven.Database\Server\Responders\Index.cs:line 92
   at Raven.Database.Server.Responders.Index.OnGet(IHttpContext context, String index) in c:\Builds\raven\Raven.Database\Server\Responders\Index.cs:line 84
   at Raven.Database.Server.Responders.Index.Respond(IHttpContext context) in c:\Builds\raven\Raven.Database\Server\Responders\Index.cs:line 46
   at Raven.Http.HttpServer.DispatchRequest(IHttpContext ctx) in c:\Builds\raven\Raven.Http\HttpServer.cs:line 399
   at Raven.Http.HttpServer.HandleActualRequest(IHttpContext ctx) in c:\Builds\raven\Raven.Http\HttpServer.cs:line 222"

更奇怪的是，当我尝试查询 StudentCount 或 CourseCount 时它有效的字段...我尝试在 School.SchoolId 字段上添加分析器，但这似乎没有帮助...我也尝试压平生成的文档，但出现了相同的错误。我错过了什么吗？

Answer 1

除了托马斯的注释之外，您还必须了解我们正在将索引的最终输出视为索引项。
如果您正在为一个复杂的对象建立索引，它将被索引为 Json 值，而不是您可以进一步查询的内容。

Answer 2

您正在按 School 对象进行分组。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)
}