为什么 ActiveRecordHooksBase.OnUpdate 在级联模式下不起作用？

发布于 2024-09-08 21:44:31 字数 613 浏览 2 评论 0原文

假设我们有两个实体 Blog 和 Post，而 Blog 有许多 Post。 Post是通过Blog间接保存的。当我重写Post中的OnUpdate时，它会导致保存具有空Blog的Post。另一方面，重写 Post 中的 OnUpdate 会导致无法正确保存它。其他人也遇到了同样的问题。

代码是：

protected override void OnUpdate()
{
    UserModified = "UserModified";
    DateModified = DateTime.Now;

    base.OnUpdate();
}

原文

Suppose we have two entities Blog and Post that Blog has many Posts. Post is saved indirectly through Blog. When I override OnUpdate in Post, it causes to save Posts that have null Blog. In the other hand overriding OnUpdate in Post causes not saving it properly. Someone else have had same problem.

The code is:

protected override void OnUpdate()
{
    UserModified = "UserModified";
    DateModified = DateTime.Now;

    base.OnUpdate();
}

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﹎☆浅夏丿初晴 2024-09-15 21:44:32

我自己找到了解决方法。如果明确设置儿童专利，就会起作用。考虑以下代码：

[ActiveRecord(Lazy = true)]
public class Lookup : ActiveRecordBase<Lookup>
{
    [HasMany(typeof(LookupItem), Cascade = ManyRelationCascadeEnum.All)]
    public virtual IList Items { set; get; }

    //other properties...
}


[ActiveRecord(Lazy = true)]
public class LookupItem : ActiveRecordBase<LookupItem>
{
    [BelongsTo("Lookup_id")]
    public virtual Lookup ContainerLookup { set; get; }

    //other properties...
}

void SaveLookup()
{
    Lookup lookup = GetLookup();
    LookupItem lookupItem = new LookupItem()
    {
        Title = LookupItemName,
        ContainerLookup = lookup
    };
    lookup.Items.Add(lookupItem);
    lookup.Save();
}

Found a work-around myself. If set patent of children explicitly, it will work. Consider following code:

[ActiveRecord(Lazy = true)]
public class Lookup : ActiveRecordBase<Lookup>
{
    [HasMany(typeof(LookupItem), Cascade = ManyRelationCascadeEnum.All)]
    public virtual IList Items { set; get; }

    //other properties...
}


[ActiveRecord(Lazy = true)]
public class LookupItem : ActiveRecordBase<LookupItem>
{
    [BelongsTo("Lookup_id")]
    public virtual Lookup ContainerLookup { set; get; }

    //other properties...
}

void SaveLookup()
{
    Lookup lookup = GetLookup();
    LookupItem lookupItem = new LookupItem()
    {
        Title = LookupItemName,
        ContainerLookup = lookup
    };
    lookup.Items.Add(lookupItem);
    lookup.Save();
}

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