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When your data model changes exceed Core Data s ability to infer how to map data from the old model to the new, you can t use a lightweight migration to automatically migrate your data. Instead, you have to create what s called a mapping model to tell Core Data how to execute the migration. A mapping model is roughly analogous to a data m odel----whereas a data model contains entities and properties, a mapping model, which is of type NSMappingModel, has entity mappings (of type NSEntityMapping) and property mappings (of type NSPropertyMapping). The entity mappings do just what you d expect them to do: they map a source entity to a target entity. The property mappings, as well, do what you d think: map source properties to target properties. The mapping model uses these mappings, along with their associated types and policies, to perform the migration. Note: Apple s documentation and code use the terms destination and target interchangeably to refer to the new data model. In this chapter, we follow suit and use both destination and target interchangeably. In a typical data migration, most entities and properties haven t changed from the old version to the new. For these cases, the entity mappings simply copy each entity from the source model to the target model. When you create a mapping model, you ll notice that Xcode generates these entity mappings, along with anything else it can infer from your model changes, and stores these mappings in the mapping model. These mappings represent how Core Data would have migrated your data in a lightweight migration. You have to create new mappings, or adjust the mappings Xcode generates, to change how your data migrates.

Both APC and XCache offer an option to set the path of the opcode cache. In APC the path of cache storage, the apc.mmap_file_mask setting, determines which shared memory mechanism it uses. System V IPC shared memory is a decent choice but limited to only 32MB on most Linux systems, which can be raised, but by default it s not enough opcode cache for typical Drupal sites. POSIX mmap shared memory can share memory blocks of any size; however, it performs quite poorly if that memory is backed by a disk file, as frequent shared memory I/O operations will translate into large and frequent disk I/O operations, which is especially noticeable on slow disks. The solution is to set your memory map path to /dev/zero, which tells mmap not to back the memory region with disk storage. Fortunately APC uses this mode by default, unless you ve explicitly set apc.mmap_file_mask to any path other than /dev/zero.

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Each entity mapping, represented by an NSEntityMapping instance, contains three things: A source entity A destination entity A mapping type When Core Data performs the migration, it uses the entity mapping to move the source to the destination, using the mapping type to determine how to do that. Table 8-1 lists the mapping types, their corresponding Core Data constants, and what they mean.

} > You can test the validation by entering a bad entry into the form at http://localhost/admin.php (see Figure 9-22).

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