Created
March 20, 2017 22:26
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Dictionary differences
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| import UIKit | |
| import CoreData | |
| var dictA: [String : Any] = ["key1": "value1", "key3": "value3", "key4": "notModified", | |
| "key5" : 1, "key6" : 1.0, | |
| "key7": ["a", "b"], "key8": ["a"], "key9": ["a", "b"]] | |
| var dictB: [String : Any] = ["key2": "value2", "key3": "modified", "key4": "notModified", | |
| "key5" : 2, "key6" : 2.0, | |
| "key7": ["a", "c"], "key8": ["a", "b"], "key9": ["a"]] | |
| public extension Dictionary { | |
| public func differences(_ other: Dictionary) -> (inserted: Dictionary, removed: Dictionary, updated: Dictionary) { | |
| var inserted = self.filter { other[$0.key] == nil } | |
| var removed = other.filter { self[$0.key] == nil } | |
| let correctUpdated: [(key: Key, value: Value)] = self.flatMap { | |
| guard let otherValue = other[$0.key] else { return nil } | |
| switch ($0.value, otherValue) { | |
| case (let a as String, let b as String): if a != b { return $0 } | |
| case (let a as Int, let b as Int): if a != b { return $0 } | |
| case (let a as Double, let b as Double): if a != b { return $0 } | |
| case (let a as NSManagedObject, let b as NSManagedObject): if a.objectID != b.objectID { return $0 } | |
| case (let a as Array<Any>, let b as Array<Any>): | |
| let insertedToArray = a.filter({ element in | |
| guard let stringElement = element as? String else { return false } | |
| return !b.contains(where: { otherElement in | |
| guard let otherStringElement = otherElement as? String else { return false } | |
| return stringElement == otherStringElement | |
| }) | |
| }) | |
| let removedFromArray = b.filter({ element in | |
| guard let stringElement = element as? String else { return false } | |
| return !a.contains(where: { otherElement in | |
| guard let otherStringElement = otherElement as? String else { return false } | |
| return stringElement == otherStringElement | |
| }) | |
| }) | |
| if !removedFromArray.isEmpty { | |
| removed.append((key: $0.key, value: removedFromArray as! Value)) | |
| } | |
| if !insertedToArray.isEmpty { | |
| inserted.append((key: $0.key, value: insertedToArray as! Value)) | |
| } | |
| return nil | |
| case (let a as NSSet, let b as NSSet): | |
| let insertedToSet = a.filter({ element in | |
| guard let managedElement = element as? NSManagedObject else { return false } | |
| return !b.contains(where: { otherElement in | |
| guard let otherManagedElement = otherElement as? NSManagedObject else { return false } | |
| return managedElement.objectID == otherManagedElement.objectID | |
| }) | |
| }) | |
| let removedFromSet = b.filter({ element in | |
| guard let managedElement = element as? NSManagedObject else { return false } | |
| return !a.contains(where: { otherElement in | |
| guard let otherManagedElement = otherElement as? NSManagedObject else { return false } | |
| return managedElement.objectID == otherManagedElement.objectID | |
| }) | |
| }) | |
| if !removedFromSet.isEmpty { | |
| removed.append((key: $0.key, value: removedFromSet as! Value)) | |
| } | |
| if !insertedToSet.isEmpty { | |
| inserted.append((key: $0.key, value: insertedToSet as! Value)) | |
| } | |
| return nil | |
| default: return nil | |
| } | |
| return nil | |
| } | |
| var insertedDict: Dictionary = [:] | |
| inserted.forEach { insertedDict[$0.key] = $0.value } | |
| var removedDict: Dictionary = [:] | |
| removed.forEach { removedDict[$0.key] = $0.value } | |
| var updatedDict: Dictionary = [:] | |
| correctUpdated.forEach { updatedDict[$0.key] = $0.value } | |
| return (insertedDict, removedDict, updatedDict) | |
| } | |
| } | |
| let (inserted, removed, updated) = dictB.differences(dictA) | |
| print("inserted: \(inserted)") | |
| print("removed: \(removed)") | |
| print("updated: \(updated)") |
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