我正在将托管记录的内容打印到文件中。我有一个主要实体,比如MyAppEntity和几个相关的实体(人员,地点等)。coredata故障信息
我看到从该文件的输出:
/Users/david/Library/Application Support/iPhone Simulator/5.1/Applications/C9ACA218-F2D6-4623-8CAF-5FE763D10FC8/Documents/
MyApp-0001 12.01.25
Summary goes here...
Nothing here yet.
Relationship 'people' on managed object (0x79eaf7f0) <NSManagedObject: 0x79eaf7f0> (entity: MyAppEntity; id: 0x79eae950 <x-coredata:/B86C9CA8-EDE4-452C-BA56-FEF50B4F0FF9/MyAppEntity/p1> ; data: {
audioName = 00010125121910;
audioNo = 0;
date = nil;
MyApp = "MyApp-0001 12.01.25";
interpret = "Nothing here yet.";
keyword = (
);
order = 0;
people = (
"0x79ee42f0 <x-coredata:/B86C9CA8-EDE4-452C-BA56-FEF50B4F0FF9/PeopleEntity/p1>",
"0x79ee4300 <x-coredata:/B86C9CA8-EDE4-452C-BA56-FEF50B4F0FF9/PeopleEntity/p2>"
);
place = (
"0x79ee6970 <x-coredata:/B86C9CA8-EDE4-452C-BA56-FEF50B4F0FF9/PlaceEntity/p2>",
"0x79ee6960 <x-coredata:/B86C9CA8-EDE4-452C-BA56-FEF50B4F0FF9/PlaceEntity/p1>"
);
recurring = 0;
summary = "Summary goes here...";
symbol = (
);
type = (
);
}) with objects {(
<NSManagedObject: 0x79ee47e0> (entity: PeopleEntity; id: 0x79ee42f0 <x-coredata:/B86C9CA8-EDE4-452C-BA56-FEF50B4F0FF9/PeopleEntity/p1> ; data: {
definition = nil;
name = me;
order = 0;
people = "<relationship fault: 0x79ef5ce0 'people'>";
}),
<NSManagedObject: 0x79ee4a70> (entity: PeopleEntity; id: 0x79ee4300 <x-coredata:/B86C9CA8-EDE4-452C-BA56-FEF50B4F0FF9/PeopleEntity/p2> ; data: {
definition = nil;
name = you;
order = 1;
people = "<relationship fault: 0x79e60840 'people'>";
})
)}
我有两个问题。首先,什么故障信息是什么意思?第二,我如何检索说people.name或place.name ..的值?
我可以张贴数据模型图,但它基本上是这样的:
MyAppEntity:属性: 标题 日期 详细 关系的人,地点等
PeopleEntity:属性: 名称 说明 订购 关系:人
PlaceEntity:属性: 名称 说明 订购 关系:地方
的关系是多对多。这是因为一个任务可以有很多人,同一个人可以完成多项任务。
感谢Gerry和Marcus Zarra的另一个post。我终于得到它。如果它可以帮助别人,这是我的代码:使用
NSManagedObjectContext *context = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *mainEntity = [NSEntityDescription entityForName:@"MainEntity" inManagedObjectContext:context];
[fetchRequest setEntity:mains];
NSError *error = nil;
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
NSLog(@"Record Count is: %i", [fetchedObjects count]);
// THIS ACTUALLY WORKS.....
for (MainEntity *mains in fetchedObjects) {
NSLog(@"Main: %@", mains.name);
NSSet *peopleSet = [mains valueForKey:@"people"];
for (id person in peopleSet) {
NSLog(@"name = %@", [person valueForKey:@"name"]);
}
NSSet *keywordSet = [mains valueForKey:@"keyword"];
for (id keyWord in keywordSet) {
NSLog(@"Keyword = %@", [keyWord valueForKey:@"word"]);
}
NSSet *placeSet = [mains valueForKey:@"place"];
for (id places in placeSet) {
NSLog(@"Place = %@", [places valueForKey:@"name"]);
}
NSSet *symbolSet = [mains valueForKey:@"symbol"];
for (id symbols in symbolSet) {
NSLog(@"Symbol = %@", [symbols valueForKey:@"symbolName"]);
}
NSSet *typeSet = [mains valueForKey:@"type"];
for (id types in typeSet) {
NSLog(@"Type = %@", [types valueForKey:@"typeName"]);
}
}
if (!fetchedObjects || error) {
NSLog(@"[ERROR] COREDATA: Fetch request raised an error - '%@'", [error description]);
return;
}
他们真的应该选择一个其他错误的名称。它引起了很多混乱(根据它出现在这里的次数来判断,无论如何!) – jrturton
谢谢Gerry。我还没有喝咖啡,所以请原谅...我输入了这段代码:NSManagedObjectContext * context = [self managedObjectContext]; \t \t NSFetchRequest * fetchRequest = [[NSFetchRequest alloc] init]; \t NSEntityDescription *实体= [NSEntityDescription entityForName:@ “AppEntity” \t \t \t \t \t \t \t \t inManagedObjectContext:上下文]; \t [fetchRequest setEntity:entity]; NSLog(@“name =%@”,[person valueForKey:@“name”]);}};}};}};}}; \t} ---但实体。人们给我一个错误 - 属性'人'没有在'NSEntityDescription *'类型的对象上找到' –
非常感谢Gerry。通过我的英特尔4004大脑消化后,我明白你写的是什么。非常感谢...我已经在上面发布了我的最终代码。如果您发现问题,请告诉我。再次,我非常感谢。 –