improved flushing behavior

CoreStore.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name = "CoreStore"
-    s.version = "1.6.8"
+    s.version = "1.6.9"
     s.license = "MIT"
     s.summary = "Unleashing the real power of Core Data with the elegance and safety of Swift"
     s.homepage = "https://github.com/JohnEstropia/CoreStore"

CoreStore/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.6.8</string>
+	<string>1.6.9</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>

CoreStore/Internal/CoreStoreFetchedResultsController.swift

@@ -48,10 +48,6 @@ internal final class CoreStoreFetchedResultsController<T: NSManagedObject>: NSFe
     
     internal init<T>(context: NSManagedObjectContext, fetchRequest: NSFetchRequest, from: From<T>? = nil, sectionBy: SectionBy? = nil, fetchClauses: [FetchClause]) {
         
-        CoreStore.assert(
-            fetchClauses.filter { $0 is OrderBy }.count > 0,
-            "An \(typeName(NSFetchedResultsController)) requires an OrderBy clause."
-        )
         from?.applyToFetchRequest(fetchRequest, context: context, applyAffectedStores: false)
         for clause in fetchClauses {
             

CoreStore/Saving and Processing/UnsafeDataTransaction.swift

@@ -97,9 +97,9 @@ public final class UnsafeDataTransaction: BaseDataTransaction {
      - Important: Note that unlike `commit()`, `flush()` does not propagate/save updates to the `DataStack` and the persistent store. However, the flushed changes will be seen by children transactions created further from the current transaction (i.e. through `transaction.beginUnsafe()`)
      - throws: an error thrown from `closure`, or an error thrown by Core Data (usually validation errors or conflict errors)
      */
-    public func flush() throws {
+    public func flush() {
         
-        try self.context.save()
+        self.context.processPendingChanges()
     }
     
     /**
@@ -109,10 +109,10 @@ public final class UnsafeDataTransaction: BaseDataTransaction {
      - parameter closure: the closure where changes can be made prior to the flush
      - throws: an error thrown from `closure`, or an error thrown by Core Data (usually validation errors or conflict errors)
      */
-    public func flush(@noescape closure: () throws -> Void) throws {
+    public func flush(@noescape closure: () throws -> Void) rethrows {
         
         try closure()
-        try self.context.save()
+        self.context.processPendingChanges()
     }
     
     /**