realm delete many (#153)

Implemented realm.deleteMany for List, RealmList and realmResults to delete objects from realm - fixes #60
Support RealmResults for..in  - fixes #37 without snapshot

.vscode/settings.json

@@ -96,5 +96,6 @@
  "flutter/realm_flutter/ios/src/**": true,
  "flutter/realm_flutter/lib/**": true,
  "flutter/realm_flutter/test/**": true
- }
+ },
+ "dart.lineLength": 160
 }

lib/src/native/realm_core.dart

@@ -316,7 +316,7 @@ class _RealmCore {
  });
  }
 
- void removeRealmObject(RealmObject object) {
+ void deleteRealmObject(RealmObject object) {
  _realmLib.invokeGetBool(() => _realmLib.realm_object_delete(object.handle._pointer));
  }
 
@@ -424,10 +424,17 @@ class _RealmCore {
  });
  }
 
+ void listDeleteAll(RealmList list) {
+ _realmLib.invokeGetBool(() => _realmLib.realm_list_remove_all(list.handle._pointer));
+ }
+
+ void resultsDeleteAll(RealmResults results) {
+ _realmLib.invokeGetBool(() => _realmLib.realm_results_delete_all(results.handle._pointer));
+ }
+
  void listClear(RealmList list) {
  _realmLib.invokeGetBool(() => _realmLib.realm_list_clear(list.handle._pointer));
  }
-
 }
 
 class LastError {

lib/src/realm_class.dart

@@ -83,14 +83,37 @@ class Realm {
  return object;
  }
 
+ /// Delete given [RealmObject] from Realm database.
+ /// Throws [RealmException] on error.
+ void delete<T extends RealmObject>(T object) {
+ try {
+ realmCore.deleteRealmObject(object);
+ } catch (e) {
+ throw RealmException("Error deleting object from databse. Error: $e");
+ }
+ }
+
+ /// Deletes [RealmObject] items in given collection from Realm database.
+ void deleteMany<T extends RealmObject>(Iterable<T> items) {
+ if (items is RealmResults<T>) {
+ realmCore.resultsDeleteAll(items);
+ } else if (items is RealmList<T>) {
+ realmCore.listDeleteAll(items);
+ } else {
+ for (T realmObject in items) {
+ realmCore.deleteRealmObject(realmObject);
+ }
+ }
+ }
+
  void addAll<T extends RealmObject>(Iterable<T> items) {
  for (final i in items) {
  add(i);
  }
  }
 
  void remove<T extends RealmObject>(T object) {
- realmCore.removeRealmObject(object);
+ realmCore.deleteRealmObject(object);
  }
 
  bool get _isInTransaction => realmCore.getIsWritable(this);

lib/src/results.dart

@@ -91,7 +91,7 @@ class _ResultsList<T extends RealmObject> extends collection.ListBase<T> {
 /// Instances of this class are typically live collections returned by [Realm.objects]
 /// that will update as new objects are either added to or deleted from the Realm
 /// that match the underlying query.
-class RealmResults<T extends RealmObject> {
+class RealmResults<T extends RealmObject> extends collection.IterableBase<T> {
  late final RealmResultsHandle _handle;
  late final Realm _realm;
  // RealmResults _results;
@@ -143,16 +143,19 @@ class RealmResults<T extends RealmObject> {
  // }
 
  /// Returns `true` if the Results collection is empty
- bool isEmpty() {
- return length == 0;
- }
+ @override
+ bool get isEmpty => length == 0;
+
+ @override
+ Iterator<T> get iterator => _RealmResultsIterator(this);
 
  /// Returns `true` if this Results collection has not been deleted and is part of a valid Realm.
  ///
  /// Accessing an invalid Results collection will throw an [RealmException]
  // bool get isValid => _results.isValid();
 
  /// Returns the number of values in the Results collection.
+ @override
  int get length => realmCore.getResultsCount(this);
 
  /// Returns a human-readable description of the objects contained in the collection.
@@ -208,3 +211,29 @@ extension RealmResultsInternal on RealmResults {
  return RealmResults<T>._(handle, realm);
  }
 }
+
+class _RealmResultsIterator<T extends RealmObject> implements Iterator<T> {
+ final RealmResults<T> _results;
+ int _index;
+ T? _current;
+
+ _RealmResultsIterator(RealmResults<T> results)
+ : _results = results,
+ _index = -1;
+
+ @override
+ T get current => _current as T;
+
+ @override
+ bool moveNext() {
+ int length = _results.length;
+ _index++;
+ if (_index >= length) {
+ _current = null;
+ return false;
+ }
+ _current = _results[_index];
+
+ return true;
+ }
+}