relation lookup progress/equatable

src/app/core/utilities/equatable.ts

@@ -0,0 +1,33 @@
+import { getExcludedFromEqualsFor, getFieldsForEquals } from './equals.decorators';
+import { hasNoValue, hasValue } from '../../shared/empty.util';
+
+function equalsByFields(object1, object2, fieldList): boolean {
+  const unequalProperty = fieldList.find((key) => {
+    if (object1[key] === object2[key]) {
+      return false;
+    }
+    if (hasNoValue(object1[key]) && hasNoValue(object2[key])) {
+      return false;
+    }
+    if (hasNoValue(object1[key]) || hasNoValue(object2[key])) {
+      return true;
+    }
+    const mapping = getFieldsForEquals(this.constructor, key);
+    if (hasValue(mapping)) {
+      return !equalsByFields(object1[key], object2[key], mapping);
+    }
+    if (this[key] instanceof EquatableObject) {
+      return !object1[key].equals(object2[key]);
+    }
+    return object1[key] !== object2[key];
+  });
+  return hasNoValue(unequalProperty);
+}
+
+export abstract class EquatableObject<T> {
+  equals(other: T): boolean {
+    const excludedKeys = getExcludedFromEqualsFor(this.constructor);
+    const keys = Object.keys(this).filter((key) => excludedKeys.findIndex((excludedKey) => key === excludedKey) < 0);
+    return equalsByFields(this, other, keys);
+  }
+}