如何集成嵌入式RavenDB和CascadeDelete软件包?

时间:2013-02-21 09:08:58

标签: c# embed ravendb cascading-deletes

我正在尝试通过CascadeDelete RavenDB软件包在这个嵌入RavenDB的应用程序中实现级联删除,但是这个软件包似乎没有被激活。我应该怎么做呢?

在下面的代码片段中是一个测试控制台应用程序,它试图在嵌入式/内存RavenDB数据库中启用级联删除,我已经安装了NuGet包RavenDB.Embedded 2.5.2505-Unstable和RavenDB.Bundles.CascadeDelete 2.5。 2505-不稳定:

using System;
using System.Linq;
using Raven.Client;
using Raven.Client.Embedded;
using Raven.Json.Linq;

namespace ConsoleApplication1
{
    public class Parent
    {
        public string Id { get; set; }
    }

    public class Child
    {
        public string Id { get; set; }
        public string ParentId { get; set; }
    }

    public static class RavenExtensions
    {
        public static void AddCascadeDeleteReference(this IAdvancedDocumentSessionOperations session,
            object entity, params string[] documentKeys)
        {
            var metadata = session.GetMetadataFor(entity);
            if (metadata == null)
                throw new InvalidOperationException(
                  "The entity must be tracked in the session before calling this method.");

            if (documentKeys.Length == 0)
                throw new ArgumentException(
                  "At least one document key must be specified.");

            const string metadataKey = "Raven-Cascade-Delete-Documents";

            RavenJToken token;
            if (!metadata.TryGetValue(metadataKey, out token))
                token = new RavenJArray();

            var list = (RavenJArray)token;
            foreach (var documentKey in documentKeys.Where(key => !list.Contains(key)))
                list.Add(documentKey);

            metadata[metadataKey] = list;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var store = new EmbeddableDocumentStore { RunInMemory = true };
            store.Initialize();
            Parent parent;
            using (var session = store.OpenSession())
            {
                parent = new Parent();
                session.Store(parent);
                session.SaveChanges();

                var child = new Child();
                child.ParentId = parent.Id;
                session.Store(child);
                session.Advanced.AddCascadeDeleteReference(parent, child.Id);
                session.SaveChanges();
            }

            using (var session = store.OpenSession())
            {
                Console.WriteLine("Before deleting parent:");
                foreach (var child in session.Query<Child>())
                {
                    Console.WriteLine("  Child: {0} of parent {1}", child.Id, child.ParentId);
                }

                parent = session.Load<Parent>(parent.Id);
                session.Delete(parent);
                session.SaveChanges();

                Console.WriteLine("After deleting parent:");
                foreach (var child in session.Query<Child>())
                {
                    Console.WriteLine("  Child: {0} of parent {1}", child.Id, child.ParentId);
                }

                Console.WriteLine("Press any key...");
                Console.ReadKey();
            }
        }
    }
}

当您运行此应用程序时,您应该看到子项未被父项删除,即使它已配置为通过级联删除。请指出我如何在此程序中进行级联删除:)

更新

我尝试在store.Initialize();之后添加以下内容,但它没有任何区别:

store.DocumentDatabase.Configuration.Catalog.Catalogs.Add(
            new AssemblyCatalog(typeof(CascadeDeleteTrigger).Assembly));

2 个答案:

答案 0 :(得分:2)

由于您处于嵌入模式,因此您有两种选择:

  1. 您可以将bundle dll复制到plugins目录中。

  2. 您可以引用捆绑包dll,然后手动将其添加到目录中:

    documentStore.DocumentDatabase.Configuration.Catalog.Catalogs
        .Add(new AssemblyCatalog(typeof(CascadeDeleteTrigger).Assembly));
    
  3. 尽管不要同时做。如果你选择#2选项,那么bundle dll不应该在plugins文件夹中,否则它会被拾取两次。

答案 1 :(得分:0)

这有点违反直觉,但我发现我需要将packages\RavenDB.Bundles.CascadeDelete.2.5.2505-Unstable\lib\net40\Raven.Bundles.CascadeDelete.dll复制到ConsoleApplication1\Plugins\Raven.Bundles.CascadeDelete.dll并配置Visual Studio将文件复制到输出目录,以便RavenDB接收它。

现在,CascadeDelete捆绑包正常工作,并且子目录已与父目录一起删除。

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