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Code Issues 95 Packages Projects Releases 10 Wiki Activity

optimize fetching objects with NSManagedObjectIDs

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This commit is contained in:
John Rommel Estropia
2015-08-26 23:59:18 +09:00
parent 10e0cf8d2c
commit 16aabe1f3b
8 changed files with 67 additions and 93 deletions
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74
CoreStore/Internal/NSManagedObject+Transaction.swift
View File

@@ -41,82 +41,8 @@ internal extension NSManagedObject {
)
}
internal dynamic class func inContext(context: NSManagedObjectContext, withObjectID objectID: NSManagedObjectID) -> Self? {
return self.typedObjectInContext(context, objectID: objectID)
}
internal func inContext(context: NSManagedObjectContext) -> Self? {
return self.typedObjectInContext(context)
}
internal func deleteFromContext() {
self.managedObjectContext?.deleteObject(self)
}
// MARK: Private
private class func typedObjectInContext<T: NSManagedObject>(context: NSManagedObjectContext, objectID: NSManagedObjectID) -> T? {
do {
let existingObject = try context.existingObjectWithID(objectID)
return (existingObject as! T)
}
catch {
CoreStore.handleError(
error as NSError,
"Failed to load existing \(typeName(self)) in context."
)
return nil
}
}
private func typedObjectInContext<T: NSManagedObject>(context: NSManagedObjectContext) -> T? {
let objectID = self.objectID
if objectID.temporaryID {
var objectIDError: NSError?
let didSucceed = withExtendedLifetime(self.managedObjectContext) { (context: NSManagedObjectContext?) -> Bool in
do {
try context?.obtainPermanentIDsForObjects([self])
return true
}
catch {
objectIDError = error as NSError
return false
}
}
if didSucceed != true {
CoreStore.handleError(
objectIDError ?? NSError(coreStoreErrorCode: .UnknownError),
"Failed to obtain permanent ID for object."
)
return nil
}
}
do {
let existingObject = try context.existingObjectWithID(objectID)
return (existingObject as! T)
}
catch {
CoreStore.handleError(
error as NSError,
"Failed to load existing \(typeName(self)) in context."
)
return nil
}
}
}

46
CoreStore/Internal/NSManagedObjectContext+Querying.swift
View File

@@ -31,7 +31,51 @@ import CoreData
internal extension NSManagedObjectContext {
// MARK: Public
// MARK: Internal
internal func fetchExisting<T: NSManagedObject>(object: T) -> T? {
if object.objectID.temporaryID {
var objectIDError: NSError?
let didSucceed = withExtendedLifetime(self) { (context: NSManagedObjectContext) -> Bool in
do {
try context.obtainPermanentIDsForObjects([object])
return true
}
catch {
objectIDError = error as NSError
return false
}
}
if didSucceed != true {
CoreStore.handleError(
objectIDError ?? NSError(coreStoreErrorCode: .UnknownError),
"Failed to obtain permanent ID for object."
)
return nil
}
}
do {
let existingObject = try self.existingObjectWithID(object.objectID)
return (existingObject as! T)
}
catch {
CoreStore.handleError(
error as NSError,
"Failed to load existing \(typeName(object)) in context."
)
return nil
}
}
internal func fetchOne<T: NSManagedObject>(from: From<T>, _ fetchClauses: FetchClause...) -> T? {