Link to Changed Page if Only One Change Present

Given a static page mapping, and a review app with a single static page
change, the review app link will now go directly to that change instead
of to the home page of the review app.

app/assets/javascripts/vue_merge_request_widget/components/deployment.vue

@@ -54,6 +54,12 @@ export default {
     deployTimeago() {
       return this.timeFormated(this.deployment.deployed_at);
     },
+    deploymentExternalUrl() {
+      if (this.deployment.changes && this.deployment.changes.length === 1) {
+        return this.deployment.changes[0].external_url;
+      }
+      return this.deployment.external_url;
+    },
     hasExternalUrls() {
       return !!(this.deployment.external_url && this.deployment.external_url_formatted);
     },
@@ -78,7 +84,7 @@ export default {
         : '';
     },
     shouldRenderDropdown() {
-      return this.deployment.changes && this.deployment.changes.length > 0;
+      return this.deployment.changes && this.deployment.changes.length > 1;
     },
     showMemoryUsage() {
       return this.hasMetrics && this.showMetrics;
@@ -154,12 +160,12 @@ export default {
                 v-if="shouldRenderDropdown"
                 class="js-mr-wigdet-deployment-dropdown inline"
                 :items="deployment.changes"
-                :main-action-link="deployment.external_url"
+                :main-action-link="deploymentExternalUrl"
                 filter-key="path"
               >
                 <template slot="mainAction" slot-scope="slotProps">
                   <review-app-link
-                    :link="deployment.external_url"
+                    :link="deploymentExternalUrl"
                     :css-class="`deploy-link js-deploy-url inline ${slotProps.className}`"
                   />
                 </template>
@@ -183,7 +189,7 @@ export default {
               </filtered-search-dropdown>
               <review-app-link
                 v-else
-                :link="deployment.external_url"
+                :link="deploymentExternalUrl"
                 css-class="js-deploy-url js-deploy-url-feature-flag deploy-link btn btn-default btn-sm inlin"
               />
             </template>

changelogs/unreleased/55925-if-there-is-only-one-changed-page-in-review-app-go-directly-there.yml

+---
+title: Review App Link to Changed Page if Only One Change Present
+merge_request: 25048
+author:
+type: changed

spec/javascripts/vue_mr_widget/components/deployment_spec.js

@@ -6,7 +6,10 @@ import mountComponent from '../../helpers/vue_mount_component_helper';
 
 describe('Deployment component', () => {
   const Component = Vue.extend(deploymentComponent);
-  const deploymentMockData = {
+  let deploymentMockData;
+
+  beforeEach(() => {
+    deploymentMockData = {
       id: 15,
       name: 'review/diplo',
       url: '/root/review-apps/environments/15',
@@ -32,6 +35,7 @@ describe('Deployment component', () => {
         },
       ],
     };
+  });
 
   let vm;
 
@@ -207,6 +211,31 @@ describe('Deployment component', () => {
     });
   });
 
+  describe('with a single change', () => {
+    beforeEach(() => {
+      deploymentMockData.changes = deploymentMockData.changes.slice(0, 1);
+
+      vm = mountComponent(Component, {
+        deployment: { ...deploymentMockData },
+        showMetrics: true,
+      });
+    });
+
+    it('renders the link to the review app without dropdown', () => {
+      expect(vm.$el.querySelector('.js-mr-wigdet-deployment-dropdown')).toBeNull();
+      expect(vm.$el.querySelector('.js-deploy-url-feature-flag')).not.toBeNull();
+    });
+
+    it('renders the link to the review app linked to to the first change', () => {
+      const expectedUrl = deploymentMockData.changes[0].external_url;
+      const deployUrl = vm.$el.querySelector('.js-deploy-url-feature-flag');
+
+      expect(vm.$el.querySelector('.js-mr-wigdet-deployment-dropdown')).toBeNull();
+      expect(deployUrl).not.toBeNull();
+      expect(deployUrl.href).toEqual(expectedUrl);
+    });
+  });
+
   describe('deployment status', () => {
     describe('running', () => {
       beforeEach(() => {