无法执行保存，因为文档已被会话修改并且还参与了延迟的 PATCH 命令 RavenDB

Question

我正在尝试在 Ravendb c# 中执行补丁命令，但收到此错误。我要做的是创建一个新条目然后尝试保存它。

这是处理 json 序列化、反序列化的相关事件类。

    public class Merchant
{
    [JsonProperty(PropertyName ="Id")]
    public string Id { get; set; }
    [JsonProperty(PropertyName = "name")]
    public string name { get; set; }
    [JsonProperty(PropertyName = "venues")]
    public System.Collections.Generic.List<Venue> venues { get; set; }
    [JsonProperty(PropertyName ="files")]
    public System.Collections.Generic.List<File> files { get; set; }
}

public class Venue
{
    [JsonProperty(PropertyName = "Id")]
    public string Id { get; set; }
    [JsonProperty(PropertyName = "name")]
    public string name { get; set; }
    [JsonProperty(PropertyName = "tills")]
    public List<Till> tills { get; set; }
    [JsonProperty(PropertyName = "files")]
    public System.Collections.Generic.List<File> files { get; set; }
}

public class Till
{
    [JsonProperty(PropertyName = "Id")]
    public string Id { get; set; }
    [JsonProperty(PropertyName = "name")]
    public string name { get; set; }
    [JsonProperty(PropertyName = "files")]
    public System.Collections.Generic.List<File> files { get; set; }
    [JsonProperty(PropertyName = "logs")]
    public List<Log> logs { get; set; }
}

// 这是最先调用的函数。

 public bool AddMerchant(Merchant m)
    {
        bool returnbool = false; // set to false at begining.
        if (DoesServiceExist("RavenDB"))
        {
            StartService("RavenDB");
            returnbool = true;

            using (IDocumentSession session = store.OpenSession())
            {
                session.Store(m);
                session.SaveChanges();
            }
        }
        return returnbool;
    }

这是我的问题开始的地方，我调用了这个函数，它告诉我我不能执行这个操作，因为它在延迟的补丁语句中。

 public void AddVenue(string idArg, Venue venue = null)
    {
        using (IDocumentSession session = store.OpenSession())
        {

            var merchant = session.Load<Merchant>(idArg);
            List<Venue> venuesList = new List<Venue>();
            if (merchant.venues == null) { session.Advanced.Patch(merchant, m => m.venues, venuesList); }
            else
            {
                session.Advanced.Patch(merchant,
                x => x.venues,
                venues => venues.Add(venue));
            }
            session.SaveChanges();

        }
    }

经过研究我认为ravendb中的Defer指的是这个：

session.advanced().defer(new PatchCommandData("blogposts/1", null, patchRequest, null));

我从不打电话。

欢迎任何帮助。

// 最终答案如下，谢谢。

    public void AddVenue(Merchant merchant, Venue venue = null)
    {
        using (IDocumentSession session = store.OpenSession())
        {
            Merchant merchantLocal = session.Load<Merchant>(merchant.Id);
            var changeVector = session.Advanced.GetChangeVectorFor(merchantLocal);
            if(merchantLocal.venues == null) { merchantLocal.venues = new List<Venue>(); }
            merchantLocal.venues.Add(venue);
            session.Store(merchantLocal, changeVector, merchantLocal.Id);
            session.SaveChanges();
        }
    }

Answer 1

如错误所述，地点属性已更改，因此在“SaveChanges”时无法应用补丁操作。

阅读有关修补文档和并发修改的信息 https://github.com/ravendb/book/blob/v4.0/Ch04/Ch04.md#patching-documents-and-concurrent-modifications

如果您知道文档 ID，则根本不要使用 Load。
只需调用 Patch 和 SaveChanges.

或
仅在某些情况下应用补丁

using (var session = store.OpenSession())
{
    var merchant = session.Load<Merchant>(idArg);

    if (merchant.venues  !=  SOME_CONDITION )
    throw new
        InvalidOperationException("venues have changed. Cannot apply patch Operation");

    List<Venue> venuesList = new List<Venue>();

    if (merchant.venues == null) { 
        session.Advanced.Patch(merchant, m => m.venues, venuesList); 
    }
    else {
        session.Advanced.Patch(merchant,
        x => x.venues,
        venues => venues.Add(venue));
    }

    session.SaveChanges();
}

无法执行保存，因为文档已被会话修改并且还参与了延迟的 PATCH 命令 RavenDB

Cannot perform save because document has been modified by the session and is also taking part in deferred PATCH command RavenDB

.net

c#

ravendb