I want to add an NSMutableArray of NSStrings to one of my Entities in my core data model. The problem is that this isn't a supported type in Core Data.
我想在我的核心数据模型中将NSStrings的NSMutableArray添加到我的一个实体中。问题是这不是Core Data中支持的类型。
I tried making a tranformable attribute, but the problem is that I see no way of turning a NSMutableArray to NSData, and then going from NSData, back to an NSMutableArray. Does anyone have an idea as to how this issue can be solved?
我尝试制作一个转换属性，但问题是我看不到将NSMutableArray转换为NSData，然后从NSData返回NSMutableArray。有没有人知道如何解决这个问题？
(I know I can archive the array, but I don't want to do that, I want it to be present in my model).
（我知道我可以存档数组，但我不想这样做，我希望它存在于我的模型中）。
1 个解决方案
#1
32
You could have a binary data attribute in your modeled object, archive the array to data, and hand it off to the object.
您可以在建模对象中具有二进制数据属性，将数组存档为数据，然后将其移交给对象。
But I think the better way would be to have a to-many relationship, instead of using an array directly.
但我认为更好的方法是建立一个多对多关系，而不是直接使用数组。
****Edit: Here's how to archive the array into NSData so that it can be used in your managed object***
****编辑：这是如何将数组存档到NSData中，以便它可以在您的托管对象中使用***
NSData *arrayData = [NSKeyedArchiver archivedDataWithRootObject:[NSArray arrayWithObjects:@"1",@"2", nil]];
Basically, any class you have which conforms to the NSCoding protocol can be archived in this way. NSArray/NSMutableArray already conform to it. They tell all of their objects to archive themselves, so they must conform too. And all of those objects' members must conform, etc. It's like a tree.
基本上，任何符合NSCoding协议的类都可以这种方式存档。 NSArray / NSMutableArray已经符合它。他们告诉他们所有的对象都要自己存档，所以他们也必须遵守。并且所有这些对象的成员必须符合，等等。它就像一棵树。
Since your array conforms, and it's an array of NSString (which also conforms), then you're golden.
既然你的数组符合，并且它是一个NSString数组（也符合），那么你就是金色的。
#1
32
You could have a binary data attribute in your modeled object, archive the array to data, and hand it off to the object.
您可以在建模对象中具有二进制数据属性，将数组存档为数据，然后将其移交给对象。
But I think the better way would be to have a to-many relationship, instead of using an array directly.
但我认为更好的方法是建立一个多对多关系，而不是直接使用数组。
****Edit: Here's how to archive the array into NSData so that it can be used in your managed object***
****编辑：这是如何将数组存档到NSData中，以便它可以在您的托管对象中使用***
NSData *arrayData = [NSKeyedArchiver archivedDataWithRootObject:[NSArray arrayWithObjects:@"1",@"2", nil]];
Basically, any class you have which conforms to the NSCoding protocol can be archived in this way. NSArray/NSMutableArray already conform to it. They tell all of their objects to archive themselves, so they must conform too. And all of those objects' members must conform, etc. It's like a tree.
基本上，任何符合NSCoding协议的类都可以这种方式存档。 NSArray / NSMutableArray已经符合它。他们告诉他们所有的对象都要自己存档，所以他们也必须遵守。并且所有这些对象的成员必须符合，等等。它就像一棵树。
Since your array conforms, and it's an array of NSString (which also conforms), then you're golden.
既然你的数组符合，并且它是一个NSString数组（也符合），那么你就是金色的。