Fixed tag deletion

no issue

- don't show "Delete tag" button when we're displaying a new/unsaved tag
- refactor the `_deleteTag()` method to be more explicit and remove handling that is no longer required since the tag screen is not nested in the tags screen
- revised the condition in `showUnsavedChangesModal()` method so that it's body doesn't fire twice when leaving the `tag` or `tag.new` route
- revised the `showUnsavedChangesModal()` method body to look at the number of changed properties on the tag rather than relying on `tag.hasChangedAttributes` which is always `true` for new models

ghost/admin/app/controllers/tag.js

@@ -126,24 +126,10 @@ export default Controller.extend({
     }),
 
     _deleteTag() {
-        let tag = this.tag;
-
-        return tag.destroyRecord().then(() => {
-            this._deleteTagSuccess();
+        return this.tag.destroyRecord().then(() => {
+            return this.transitionToRoute('tags');
         }, (error) => {
-            this._deleteTagFailure(error);
+            return this.notifications.showAPIError(error, {key: 'tag.delete'});
         });
-    },
-
-    _deleteTagSuccess() {
-        let currentRoute = this.router.currentRouteName || '';
-
-        if (currentRoute.match(/^tags/)) {
-            this.transitionToRoute('tags');
-        }
-    },
-
-    _deleteTagFailure(error) {
-        this.notifications.showAPIError(error, {key: 'tag.delete'});
     }
 });

ghost/admin/app/routes/tag.js

@@ -38,15 +38,15 @@ export default AuthenticatedRoute.extend(CurrentUserSettings, {
     },
 
     showUnsavedChangesModal(transition) {
-        if (transition.from && transition.from.name.match(/^tag$|^tag\.new$/) && transition.targetName) {
+        if (transition.from && transition.from.name === this.routeName && transition.targetName) {
             let {controller} = this;
 
-            if (!controller.tag.isDeleted && controller.tag.hasDirtyAttributes) {
+            // tag.changedAttributes is always true for new tags but number of changed attrs is reliable
+            if (!controller.tag.isDeleted && Object.keys(controller.tag.changedAttributes()).length > 0) {
                 transition.abort();
                 controller.send('toggleUnsavedChangesModal', transition);
                 return;
             }
         }
     }
-
 });

ghost/admin/app/templates/tag.hbs

@@ -14,9 +14,12 @@
             setProperty=(action "setProperty")
             showDeleteTagModal=(action "toggleDeleteTagModal")}}
     </form>
+
+    {{#unless this.tag.isNew}}
         <button class="gh-btn gh-btn-red gh-btn-icon mb15" {{action "toggleDeleteTagModal"}}>
             <span>Delete tag</span>
         </button>
+    {{/unless}}
 </section>
 
 {{#if showUnsavedChangesModal}}