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Cascading deletion for RealmSwift
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import Foundation | |
import RealmSwift | |
import Realm | |
//Forked from: https://gist.github.com/krodak/b47ea81b3ae25ca2f10c27476bed450c | |
internal protocol CascadingDeletable: RealmSwift.Object { | |
static var propertiesToCascadeDelete: [String] { get } | |
} | |
extension Realm { | |
internal func cascadingDelete(_ object: RealmSwift.Object) { | |
var toBeDeleted: Set<RLMObjectBase> = [object] | |
while let element = toBeDeleted.popFirst() as? RealmSwift.Object { | |
guard !element.isInvalidated else { continue } | |
if let cascadingDeletable = element as? CascadingDeletable { | |
cascade(into: cascadingDeletable, toBeDeleted: &toBeDeleted) | |
} | |
delete(element) | |
} | |
} | |
private func cascade(into object: CascadingDeletable, toBeDeleted: inout Set<RLMObjectBase>) { | |
let objectType = type(of: object) | |
guard let schema = objectType.sharedSchema() else { return } | |
let primaryKey = objectType.primaryKey() | |
let primaryKeyValue = primaryKey.flatMap(object.value(forKey:)) | |
let properties = (schema.properties + schema.computedProperties) | |
.filter { objectType.propertiesToCascadeDelete.contains($0.name) } | |
for property in properties { | |
switch object.value(forKey: property.name) { | |
case let realmObject as RLMObjectBase: | |
toBeDeleted.insert(realmObject) | |
case let list as RLMListBase: | |
for index in 0 ..< list._rlmArray.count { | |
guard let realmObject = list._rlmArray.object(at: index) as? RLMObjectBase else { continue } | |
toBeDeleted.insert(realmObject) | |
} | |
default: //LinkingObjects | |
if let linkOriginPropertyName = property.linkOriginPropertyName, | |
let linkOriginTypeName = property.objectClassName, | |
let primaryKey = primaryKey, | |
let primaryKeyValue = primaryKeyValue { | |
dynamicObjects(linkOriginTypeName) | |
.filter("%K == %@", "\(linkOriginPropertyName).\(primaryKey)", primaryKeyValue) | |
.forEach { toBeDeleted.insert($0) } | |
} | |
} | |
} | |
} | |
} |
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Please feel free to test the version with replaced RLMListBase