🐛 fix autosave+transition on title blur with empty title (#767)

refs TryGhost/Ghost#8525
- fix `saveTitle` action
	- don't abort title save when we have an empty title
	- force a "dirty" state so that the save actually happens
- add acceptance test for title blur behaviour
- extract multiple instances `"(Untitled)"` into a const

ghost/admin/app/mixins/editor-base-controller.js

@@ -25,6 +25,7 @@ const {testing} = Ember;
 // to know if the model has been changed (`controller.hasDirtyAttributes`)
 const watchedProps = ['model.scratch', 'model.titleScratch', 'model.hasDirtyAttributes', 'model.tags.[]'];
 
+const DEFAULT_TITLE = '(Untitled)';
 const TITLE_DEBOUNCE = testing ? 10 : 700;
 
 PostModel.eachAttribute(function (name) {
@@ -148,7 +149,7 @@ export default Mixin.create({
 
         // Set a default title
         if (!this.get('model.titleScratch').trim()) {
-            this.set('model.titleScratch', '(Untitled)');
+            this.set('model.titleScratch', DEFAULT_TITLE);
         }
 
         this.set('model.title', this.get('model.titleScratch'));
@@ -492,9 +493,9 @@ export default Mixin.create({
 
         model.set('titleScratch', newTitle);
 
-        // if model is not new and title is not '(Untitled)', or model is new and
+        // if model is not new and title is not DEFAULT_TITLE, or model is new and
         // has a title, don't generate a slug
-        if ((!model.get('isNew') || model.get('title')) && newTitle !== '(Untitled)') {
+        if ((!model.get('isNew') || model.get('title')) && newTitle !== DEFAULT_TITLE) {
             return;
         }
 
@@ -508,7 +509,7 @@ export default Mixin.create({
         let title = this.get('model.titleScratch');
 
         // Only set an "untitled" slug once per post
-        if (title === '(Untitled)' && this.get('model.slug')) {
+        if (title === DEFAULT_TITLE && this.get('model.slug')) {
             return;
         }
 
@@ -606,10 +607,13 @@ export default Mixin.create({
             let currentTitle = this.get('model.title');
             let newTitle = this.get('model.titleScratch').trim();
 
-            if (newTitle === currentTitle) {
+            if (currentTitle && newTitle && newTitle === currentTitle) {
                 return;
             }
 
+            // this is necessary to force a save when the title is blank
+            this.set('hasDirtyAttributes', true);
+
             if (this.get('model.isDraft')) {
                 this.send('save', {
                     silent: true,

ghost/admin/mirage/config/posts.js

@@ -7,6 +7,10 @@ export default function mockPosts(server) {
     server.post('/posts', function ({posts}) {
         let attrs = this.normalizedRequestAttrs();
 
+        // mirage expects `author` to be a reference but we only have an ID
+        attrs.authorId = attrs.author;
+        delete attrs.author;
+
         if (isBlank(attrs.slug) && !isBlank(attrs.title)) {
             attrs.slug = dasherize(attrs.title);
         }

ghost/admin/tests/acceptance/editor-test.js

@@ -520,5 +520,33 @@ describe('Acceptance: Editor', function() {
             expect(find('select[name="post-setting-author"]').val()).to.equal('2');
             expect(server.db.posts[0].authorId).to.equal(author.id);
         });
+
+        it('autosaves when title loses focus', async function () {
+            let role = server.create('role', {name: 'Administrator'});
+            server.create('user', {name: 'Admin', roles: [role]});
+
+            await visit('/editor');
+
+            // NOTE: there were checks here for the title element having focus
+            // but they were very temperamental whilst running tests in the
+            // browser so they've been left out for now
+
+            expect(
+                currentURL(),
+                'url on initial visit'
+            ).to.equal('/editor');
+
+            await triggerEvent(testSelector('editor-title-input'), 'blur');
+
+            expect(
+                find(testSelector('editor-title-input')).val(),
+                'title value after autosave'
+            ).to.equal('(Untitled)');
+
+            expect(
+                currentURL(),
+                'url after autosave'
+            ).to.equal('/editor/1');
+        });
     });
 });