NSArrayController 子类在 fetchWithRequest 中 setFetchLimit

发布于 2024-11-19 02:00:03 字数 648 浏览 1 评论 0原文

我有一个绑定到 CoreData 支持的 NSArrayController 的 NSPopupButton。

我对 NSArrayController 进行了子类化以设置 fetchLimit 和 SortDescriptor。

问题如下：

FetchLimit 仅适用于初始加载。当以编程方式将条目添加到 CoreData Store 时，NSPopupButton 会反映并显示新条目，但不应用提取限制。我还尝试将 merge: 参数设置为 NO，但这似乎不会影响更新/重新获取。

- (BOOL) fetchWithRequest:(NSFetchRequest *)fetchRequest 
                    merge:(BOOL)merge 
                    error:(NSError **)error
{

    if(fetchRequest)
        [fetchRequest setFetchLimit:10];

    NSLog(@"fetchWithRequest: %@", fetchRequest);
    return [super fetchWithRequest:fetchRequest merge:NO error:error];
}

我错过了什么吗？

原文

I have a NSPopupButton that is bound to a CoreData backed NSArrayController.

I subclassed the NSArrayController to set a fetchLimit and SortDescriptor.

The problem is the following:

The FetchLimit only applies on the initial load. When entries are added to the CoreData Store programatically, the NSPopupButton reflects and shows the new entries, but does not apply the fetch limit. I also tried to set the merge: parameter to NO, but this doesn't seem to affect the updates/refetches.

- (BOOL) fetchWithRequest:(NSFetchRequest *)fetchRequest 
                    merge:(BOOL)merge 
                    error:(NSError **)error
{

    if(fetchRequest)
        [fetchRequest setFetchLimit:10];

    NSLog(@"fetchWithRequest: %@", fetchRequest);
    return [super fetchWithRequest:fetchRequest merge:NO error:error];
}

am i missing something?

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