[ADF-4522] Metadata value is not rolled back upon error (#5550)

* * initial commit

* * removed breaking change

* * fixed ts

* * fixed minor changes

* * fixed changes

* * minor changes

* * fixed unit test

* * docs added

* * fixed date clear problem

* * fixed unit test

lib/core/card-view/components/base-card-view.ts

@@ -0,0 +1,47 @@
+/*!
+ * @license
+ * Copyright 2019 Alfresco Software, Ltd.
+ *
+ * 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 { Input, OnDestroy } from '@angular/core';
+import { CardViewUpdateService } from '../services/card-view.services';
+import { CardViewItem } from '../interfaces/card-view.interfaces';
+import { CardViewBaseItemModel } from '../models/card-view-baseitem.model';
+import { Subject } from 'rxjs';
+import { takeUntil } from 'rxjs/operators';
+
+export abstract class BaseCardView<T extends CardViewItem> implements OnDestroy {
+
+    @Input()
+    property: T;
+
+    protected destroy$ = new Subject<boolean>();
+
+    constructor(protected cardViewUpdateService: CardViewUpdateService) {
+        this.cardViewUpdateService.updateItem$
+            .pipe(takeUntil(this.destroy$))
+            .subscribe((itemModel: CardViewBaseItemModel) => {
+            if (this.property.key === itemModel.key) {
+                this.property.value = itemModel.value;
+            }
+        });
+    }
+
+    ngOnDestroy(): void {
+        this.destroy$.next(true);
+        this.destroy$.complete();
+    }
+
+}