MAGETWO-66627: [GitHub] Default Post Code is applied for all Order's addresses if zip is not required

Author: slamking

app/code/Magento/Checkout/view/frontend/web/js/model/default-post-code-resolver.js

@@ -0,0 +1,34 @@
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+define([], function () {
+    /**
+     * Define necessity of using default post code value
+     */
+    var useDefaultPostCode;
+
+    return {
+
+        /**
+         * Resolve default post code
+         *
+         * @returns {string|undefined}
+         */
+        resolve: function () {
+            return useDefaultPostCode ?  window.checkoutConfig.defaultPostcode : undefined;
+        },
+
+        /**
+         * Set state to useDefaultPostCode variable
+         *
+         * @param shouldUseDefaultPostCode
+         * @returns {underscore}
+         */
+        setUseDefaultPostCode: function (shouldUseDefaultPostCode)
+        {
+            useDefaultPostCode = shouldUseDefaultPostCode;
+            return this;
+        }
+    };
+});

app/code/Magento/Ui/view/base/web/js/form/element/region.js

@@ -9,8 +9,9 @@
 define([
     'underscore',
     'uiRegistry',
-    './select'
-], function (_, registry, Select) {
+    './select',
+    'Magento_Checkout/js/model/default-post-code-resolver'
+], function (_, registry, Select, DefaultPostCodeResolver) {
     'use strict';
 
     return Select.extend({
@@ -33,9 +34,10 @@ define([
             if (!value) {
                 return;
             }
-
             option = options[value];
-
+            DefaultPostCodeResolver
+                .setUseDefaultPostCode('undefined' !== typeof option.is_zipcode_optional &&
+                true === option.is_zipcode_optional ? false : true);
             if (this.skipValidation) {
                 this.validation['required-entry'] = false;
                 this.required(false);

dev/tests/js/jasmine/tests/app/code/Magento/Checkout/frontend/js/model/default-post-code-resolver.test.js

@@ -0,0 +1,22 @@
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+define([
+    'underscore',
+    'Magento_Checkout/js/model/default-post-code-resolver'
+], function (_, DefaultPostCodeResolver) {
+    'use strict';
+
+    describe('checkout/js/model/default-post-code-resolver', function () {
+        var defaultPostCodeResolver;
+
+        beforeEach(function () {
+            defaultPostCodeResolver = DefaultPostCodeResolver;
+        });
+
+        it('resolve', function () {
+            expect(defaultPostCodeResolver.resolve()).toBe(undefined);
+        });
+    });
+});