尝试通过代码创建递归索引时在 RavenDB 中获取 IndexCompilationException

问题描述

我是 RavendB 的新手，我在通过代码创建一些索引时遇到了问题，尤其是递归索引。

我有一个包含用户和组集合的 ravendb 实例。 User 有一个 BelongsTo 属性，它是用户直接所属组的组 ID 数组，Groups 也有一个 BelongsTo 属性，其中包含该组直接所属的组。所以：

如果 X 组属于 Z 组，用户 X1 属于 X 组，我有：

Group: {
  Id: 'Z',BelongsTo: []
}

Group: {
  Id: 'X',BelongsTo: ['Z']
}

User: {
  Id: 'X1',BelongsTo: ['X']
}

我想要一个索引，让我为每个用户直接或间接地获取他所属的所有组。可以有组的层次结构，唯一的规则是这个层次结构不能是循环的（我们不能让 A 组属于 B 组，而 B 组属于 A 组）。

在上面的例子中，我会让索引返回如下内容：

{
  UserId: 'X1',Name: 'xpto',BelongsTo: ['X','Z']
}

我尝试使用 Recurse 创建索引，就像在以下 URL 中一样：

https://ayende.com/blog/185537-A/recursive-indexing-in-ravendb

这是我的索引的 C# 代码：

public class User_BelongedGroups : AbstractIndexCreationTask<User>
    {
        public User_BelongedGroups()
        {
            Map = users =>
            from u in users
            select new
            {
                UserId = u.Id,u.Name,BelongsTo = u.BelongsTo.Select(g => Recurse(g,gId => LoadDocument<Group>(gId).BelongsTo))
            };
        }
    }

当我尝试创建此索引时，我收到 IndexCompilationException。当我查看 InnerException 时，我得到以下文本：

IndexCompilationException: Failed to compile index User/BelongedGroups

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Lucene.Net.Documents;
using Raven.Client.Documents.Indexes;
using Raven.Server.Documents.Indexes.Static;
using Raven.Server.Documents.Indexes.Static.Linq;
using Raven.Server.Documents.Indexes.Static.Extensions;

namespace Raven.Server.Documents.Indexes.Static.Generated
{
    public class Index_User_BelongedGroups : StaticIndexBase
    {
        IEnumerable Map_0(IEnumerable<dynamic> docs)
        {
            foreach (var u in docs)
            {
                yield return new
                {
                    UserId = Id(u),Name = u.Name,BelongsTo = ((IEnumerable<dynamic>)u.BelongsTo).Select((Func<dynamic,dynamic>)(g => this.Recurse<string,string>(g,gId => (this.LoadDocument(gId,"Groups")).BelongsTo)))
                }

                ;
            }
        }

        public Index_User_BelongedGroups()
        {
            this.AddMap("Users",this.Map_0);
            this.AddReferencedCollection("Users","Groups");
            this.OutputFields = new System.String[] { "UserId","Name","BelongsTo" };
        }
    }
}

(26,111): error CS0308: The non-generic method 'AbstractStaticIndexBase.Recurse(object,Func<dynamic,dynamic>)' cannot be used with type arguments,IndexDeFinitionProperty='',ProblematicText=''   at Raven.Server.Documents.Indexes.Static.IndexCompiler.CompileInternal(String originalName,String cSharpSafeName,MemberDeclarationSyntax class,IndexDeFinition deFinition) in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Documents\Indexes\Static\IndexCompiler.cs:line 221
   at Raven.Server.Documents.Indexes.Static.IndexCompiler.Compile(IndexDeFinition deFinition) in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Documents\Indexes\Static\IndexCompiler.cs:line 149
   at Raven.Server.Documents.Indexes.Static.IndexCompilationCache.GenerateIndex(IndexDeFinition deFinition,RavenConfiguration configuration,IndexType type) in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Documents\Indexes\Static\IndexCompilationCache.cs:line 133
   at Raven.Server.Documents.Indexes.Static.IndexCompilationCache.<>c__displayClass2_0.<GetDocumentsIndexInstance>b__1() in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Documents\Indexes\Static\IndexCompilationCache.cs:line 47
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication,Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at Raven.Server.Documents.Indexes.Static.IndexCompilationCache.GetDocumentsIndexInstance(IndexDeFinition deFinition,IndexType type) in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Documents\Indexes\Static\IndexCompilationCache.cs:line 56
   at Raven.Server.Documents.Indexes.IndexStore.ValidateStaticIndex(IndexDeFinition deFinition) in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Documents\Indexes\IndexStore.cs:line 750
   at Raven.Server.Documents.Indexes.IndexStore.CreateIndexInternal(IndexDeFinition deFinition,String raftRequestId,String source) in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Documents\Indexes\IndexStore.cs:line 635
   at Raven.Server.Documents.Handlers.Admin.AdminIndexHandler.PutInternal(Boolean validatedAsAdmin) in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Documents\Handlers\Admin\AdminIndexHandler.cs:line 91
   at Raven.Server.Documents.Handlers.Admin.AdminIndexHandler.Put() in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Documents\Handlers\Admin\AdminIndexHandler.cs:line 33
   at Raven.Server.Routing.RequestRouter.HandlePath(RequestHandlerContext reqCtx) in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\Routing\RequestRouter.cs:line 196
   at Raven.Server.RavenServerStartup.RequestHandler(HttpContext context) in C:\Builds\RavendB-Stable-5.1\51010\src\Raven.Server\RavenServerStartup.cs:line 242

我在这里做错了什么？

解决方法

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