RavenDB升级：2.5到3.5-无法编译索引

我目前正在将我们的解决方案从RavenDB 2.5升级到3.5，但在创建索引时出现以下异常：看起来它与

分组方式有关

IndexCreation.CreateIndexes(typeof(RavenGuid).Assembly, store);

索引定义

public RecordingArtistTypeaheadIndex()
{
    Map = docs => docs.Select(x => new Definition { Artist = x.ArtistDisplayName });

    Reduce = results => results.SelectMany(r => r.Artist.Split('|')).GroupBy(x => x).Select(g => new Definition { Artist = g.Key });

    Store(x => x.Artist, FieldStorage.Yes);

    Index(x => x.Artist, FieldIndexing.Analyzed);
}

异常消息

Compilation Errors:

Line 40, Position 11: Error CS1525 - Invalid expression term 'by'
Line 40, Position 14: Error CS0745 - Expected contextual keyword 'by'

public class Index_RecordingArtistTypeaheadIndex : Raven.Database.Linq.AbstractViewGenerator
{
    public Index_RecordingArtistTypeaheadIndex()
    {
        this.ViewText = @"from x in docs.RepertoireResources
                          select new {
                              Artist = x.ArtistDisplayName
                          }
                          from x in results.SelectMany(r => r.Artist.Split(new char[] {'|'}))
                          group x by x into g
                          select new {
                              Artist = g.Key
                          }";

        this.ForEntityNames.Add("RepertoireResources");

        this.AddMapDefinition(docs => 
            from x in ((IEnumerable<dynamic>)docs)
            where string.Equals(x["@metadata"]["Raven-Entity-Name"], "RepertoireResources", System.StringComparison.InvariantCultureIgnoreCase)
            select new {
                Artist = x.ArtistDisplayName,
                __document_id = x.__document_id
            });

        this.ReduceDefinition = results => 
            from x in results.SelectMany((Func<dynamic, IEnumerable<dynamic>>)(r => (IEnumerable<dynamic>)(r.Artist.Split(new char[] {
                '|'
            }))))
            group  by x into g
            select new {
                Artist = g.Key
            };

        this.GroupByExtraction = x => x;
        this.AddField("Artist");
        this.AddQueryParameterForMap("ArtistDisplayName");
        this.AddQueryParameterForMap("__document_id");
        this.AddQueryParameterForReduce("ArtistDisplayName");
        this.AddQueryParameterForReduce("__document_id");
    }
}

源代码

Compilation Errors:

Line 40, Position 11: Error CS1525 - Invalid expression term 'by'
Line 40, Position 14: Error CS0745 - Expected contextual keyword 'by'

public class Index_RecordingArtistTypeaheadIndex : Raven.Database.Linq.AbstractViewGenerator
{
    public Index_RecordingArtistTypeaheadIndex()
    {
        this.ViewText = @"from x in docs.RepertoireResources
                          select new {
                              Artist = x.ArtistDisplayName
                          }
                          from x in results.SelectMany(r => r.Artist.Split(new char[] {'|'}))
                          group x by x into g
                          select new {
                              Artist = g.Key
                          }";

        this.ForEntityNames.Add("RepertoireResources");

        this.AddMapDefinition(docs => 
            from x in ((IEnumerable<dynamic>)docs)
            where string.Equals(x["@metadata"]["Raven-Entity-Name"], "RepertoireResources", System.StringComparison.InvariantCultureIgnoreCase)
            select new {
                Artist = x.ArtistDisplayName,
                __document_id = x.__document_id
            });

        this.ReduceDefinition = results => 
            from x in results.SelectMany((Func<dynamic, IEnumerable<dynamic>>)(r => (IEnumerable<dynamic>)(r.Artist.Split(new char[] {
                '|'
            }))))
            group  by x into g
            select new {
                Artist = g.Key
            };

        this.GroupByExtraction = x => x;
        this.AddField("Artist");
        this.AddQueryParameterForMap("ArtistDisplayName");
        this.AddQueryParameterForMap("__document_id");
        this.AddQueryParameterForReduce("ArtistDisplayName");
        this.AddQueryParameterForReduce("__document_id");
    }
}

公共类索引\u记录ArtistTypeaHeadIndex:Raven.Database.Linq.AbstractViewGenerator
{
公共索引\u记录ArtistTypeaHeadIndex（）
{
docs.RepertoireResources中x的this.ViewText=@
选择新的{
艺术家=x.ArtistDisplayName
}
从results.SelectMany中的x（r=>r.Artist.Split（新字符[]{'|'}））
将x按x分组为g
选择新的{
艺术家=g.钥匙
}";
此.ForEntityNames.Add（“曲目资源”）；
此.AddMapDefinition（文档=>
从（（IEnumerable）文档中的x开始
其中string.Equals（x[“@metadata”][“Raven实体名称”]，“RepertoireResources”，System.StringComparison.InvariantCultureIgnoreCase）
选择新的{
艺术家=x.ArtistDisplayName，
__文档id=x.\u文档id
});
this.ReduceDefinition=结果=>
从结果中的x选择many（（Func）（r=>（IEnumerable）（r.Artist.Split）（新字符[]）{
'|'
}))))
将x分组为g
选择新的{
艺术家=g.钥匙
};
this.GroupByExtraction=x=>x；
本文件为AddField（“艺术家”）；
此.AddQueryParameterForMap（“ArtistDisplayName”）；
此.AddQueryParameterForMap（“文档id”）；
此.addQueryParametersForReduce（“ArtistDisplayName”）；
此.AddQueryParameterForReduce（“\u\u文档\u id”）；
}
}

以前有人遇到过这个问题吗？
解决方案：我更改了reduce，以便SelectMany返回匿名类型，然后我使用GroupBy中的.Artist属性

public RecordingArtistTypeaheadIndex()
{
    Map = docs => docs.Select(x => new Definition
    {
        Artist = x.ArtistDisplayName
    });

    Reduce = results => results
        .SelectMany(r => r.Artist.Split('|'), (x, y) => new Definition { Artist = y })
        .GroupBy(x => x.Artist)
        .Select(g => new Definition
        {
            Artist = g.Key
        });

    Store(x => x.Artist, FieldStorage.Yes);

    Index(x => x.Artist, FieldIndexing.Analyzed);
}

你没有分组。您使用Map/Reduce索引的目的是什么
GroupBy（x=>x）
我正在使用GroupBy删除重复项：）可能是个骗局。