Counter first steps

packages/bindgen/spec.yml

@@ -666,6 +666,11 @@ classes:
       get_backlink_count: '() const -> count_t'
       get_backlink_view: '(src_table: TableRef, src_col_key: ColKey) -> TableView'
       create_and_set_linked_object: '(column: ColKey) -> Obj'
+      add_int: # NOTE: ignoring ability to chain calls (TODO Maybe we should add it?)
+        - '(column: ColKey, value: int64_t) const'
+        - sig: '(column: StringData, value: int64_t) const'
+          suffix: 'by_name'
+
 
   Transaction:
     sharedPtrWrapped: TransactionRef

packages/realm/src/Counter.ts

@@ -0,0 +1,111 @@
+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2023 Realm Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////
+
+import {
+  BSON,
+  CanonicalObjectSchema,
+  ClassHelpers,
+  Constructor,
+  DefaultObject,
+  Dictionary,
+  JSONCacheMap,
+  ObjectChangeCallback,
+  ObjectListeners,
+  OrderedCollection,
+  Realm,
+  RealmInsertionModel,
+  RealmObjectConstructor,
+  Results,
+  assert,
+  binding,
+  flags,
+  getTypeName,
+} from "./internal";
+
+const INTERNAL = Symbol("Object#internal");
+
+export class Counter {
+
+  /**
+   * @internal
+   * The object's representation in the binding.
+   */
+    public declare readonly         [INTERNAL]: binding.Obj;
+
+
+  readonly value: number;
+  readonly columnKey: number = 23; //TODO Probably this needs to be something else
+  //TODO We need to pass also the handle here probably
+
+  constructor(value: number) {
+    this.value = value;
+  }
+
+  increment(val: number): Counter {
+    return new Counter(this.value + val); //This will actually write in the db too
+    //This depends on the fact if the counter is considered readonly or not
+  }
+
+  decrement(val: number): Counter {
+
+    return new Counter(this.value - val);
+
+  }
+
+  static with(value: number) {
+    return new Counter(value);
+  }
+
+  /**
+   * TODO 
+   * - Find out why the linter does not work...
+   * - Check what api I can use to call increment/decrement
+   * - Modify the schema to accept this new type
+   * - When accessing properties on an object, change return type depending on schema definition 
+   * 
+   * 
+   */
+}
+
+const MyClassSchema: Realm.ObjectSchema = {
+  name: "Person",
+  properties: {
+    counter: "Counter",
+  },
+};
+
+export class MyClass extends Realm.Object {
+  counter!: Counter;
+  static schema: Realm.ObjectSchema = MyClassSchema;
+}
+
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+async function example() {
+  const realm = await Realm.open({ schema: [MyClass] });
+
+  const ob = realm.write(() => {
+    return realm.create<MyClass>(MyClassSchema.name, {
+      counter: Counter.with(23),
+    });
+  });
+
+  ob.counter.increment(2);
+
+  // eslint-disable-next-line no-console
+  console.log(ob.counter.value);
+}