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Add a note about the use of an indexing context to the README.md

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Blake Watters
2012-09-30 22:47:59 -04:00
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Code/Search/README.md
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@@ -54,6 +54,12 @@ Searching an indexed entity is performed via a standard Core Data fetch request
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### Using an Indexing Context
For applications loading payloads containing a large number of searchable entities, it may become desirable to make use of a dedicated managed object context for the purposes of search indexing. When observing the persistent store context for changes, the indexer awaits the posting of a `NSManagedObjectContextWillSave` notification and performs indexing before the save is complete. Because of the nature of parent/child managed object contexts in Core Data, this can introduce blockage of any managed object contexts with the `NSMainQueueConcurrencyType` that are children of the persistent store context.
To avoid this, a dedicated `indexingContext` can be assigned to the search indexer. When an indexing context is provided, the indexing is performed in response to a `NSManagedObjectContextDidSave` notification on the indexing context. It is recommended that the indexing context have a direct connection to the persistent store coordinator and that its changes are merged back into the persistent store and main queue managed object contexts via observation of the `NSManagedObjectContextDidSave`.
## Sample Code and Help
An example project is provided in the Examples subdirectory of the RestKit distribution.