如何dyanmic通过CoreData模型创建一个新的实体（表）？

问题描述

我想在SQLite中创建一个新的Entity（表）。我的代码如下：

I want to create a new Entity (table) in SQLite. My code is as follows:

+(BOOL)CreateDataSet:(NSManagedObjectModel *) model  
    attributes:(NSDictionary*)attributes 
    entityName:(NSString*) entityName 
{ 
    NSEntityDescription *entityDef = [[NSEntityDescription alloc] init];

    [entityDef setName:entityName];
    [entityDef setManagedObjectClassName:entityName];
    [model setEntities:[NSArray arrayWithObject:entityDef]];
    NSArray *properties =   [CoreDataHelper CreateAttributes:attributes];
    [entityDef setProperties:properties];

    [entityDef release];

    return TRUE;
}

但它会引发错误：

Terminating app due to uncaught exception 'NSInternalInconsistencyException', 
reason: 'Can't modify an immutable model.'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x01c5abe9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x01daf5c2 objc_exception_throw + 47
    2   CoreData                            0x0152634a -[NSManagedObjectModel(_NSInternalMethods) _throwIfNotEditable] + 106
    3   CoreData                            0x01526904 -[NSManagedObjectModel setEntities:] + 36
....

这似乎表明模型是只读的。

That seems to show the model is read only.

推荐答案

（重点是我的）

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