问题描述
例如,如果我有一个 NSManagedObject
名为 Items
,并且我想设置 ManagedObjectContext
以后(不是初始化时),我该怎么做?
>
Items * item = [NSEntityDescription insertNewObjectForEntityForName:@Items
inManagedObjectContext:_context];
自动将其与 _context
关联。 / p>
但是如果我想这样做呢?
= [[Items alloc] init];
item.first = @bla;
item.second = @bla bla;
而我想将该对象传递给另一个方法,然后将其与上下文相关联并保存
所以有办法做一个简单的 item.managedObjectContext = _context
或类似的东西吗?
这种方法完全有效...
Items * item = [[Item alloc] initWithEntity:entity insertIntoManagedObjectContext:nil];
item.first = @blah;
item.second = @blah blah;
然后,您可以自由地将此对象传递到需要的位置,将其提交到受管对象上下文,只需插入它并保存。
[managedObjectContext insertObject:item];
NSError * error = nil;
[managedObjectContext save:& error];
For example, if I have an NSManagedObject
named Items
, and I want to set the ManagedObjectContext
later (not when initialised), how would I do that?
At the moment I'm doing this:
Items *item = [NSEntityDescription insertNewObjectForEntityForName:@"Items"
inManagedObjectContext:_context];
That automatically associates it to _context
.
But what if I want to do this:
Items *item = [[Items alloc] init];
item.first = @"bla";
item.second = @"bla bla";
And I would want to pass that object to another method which would then associate it with the context and save it.
So is there any way to just do a simple item.managedObjectContext = _context
or something like that?
This approach would be perfectly valid...
Items *item = [[Item alloc] initWithEntity:entity insertIntoManagedObjectContext:nil];
item.first = @"blah";
item.second = @"blah blah";
You're then free to pass this object around to where its needed and when you're ready to commit it to a managed object context, simply insert it and save.
[managedObjectContext insertObject:item];
NSError *error = nil;
[managedObjectContext save:&error];
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