Moved update headline HTML into discussion model

app/assets/javascripts/diff_notes/components/resolve_btn.js.es6

@@ -25,6 +25,9 @@
       }
     },
     computed: {
+      discussion: function () {
+        return this.discussions[this.discussionId];
+      },
       note: function () {
         return CommentsStore.get(this.discussionId, this.noteId);
       },
@@ -63,14 +66,14 @@
         }
 
         promise.then((response) => {
-          const data = response.json();
           this.loading = false;
 
           if (response.status === 200) {
+            const data = response.json();
             const resolved_by = data ? data.resolved_by : null;
 
             CommentsStore.update(this.discussionId, this.noteId, !this.isResolved, resolved_by);
-            ResolveService.updateDiscussionHeadline(this.discussionId, data);
+            this.discussion.updateHeadline(data);
           } else {
             new Flash('An error occurred when trying to resolve a comment. Please try again.', 'alert');
           }

app/assets/javascripts/diff_notes/models/discussion.js.es6

@@ -53,4 +53,18 @@ class DiscussionModel {
       }
     }
   }
+
+  updateHeadline (data) {
+    const $discussionHeadline = $(`.discussion[data-discussion-id="${this.id}"] .js-discussion-headline`);
+
+    if (data.discussion_headline_html) {
+      if ($discussionHeadline.length) {
+        $discussionHeadline.replaceWith(data.discussion_headline_html);
+      } else {
+        $(`.discussion[data-discussion-id="${this.id}"] .discussion-header`).append(data.discussion_headline_html);
+      }
+    } else {
+       $discussionHeadline.remove();
+    }
+  }
 }

app/assets/javascripts/diff_notes/services/resolve.js.es6

@@ -28,13 +28,34 @@
     }
 
     toggleResolveForDiscussion(namespace, mergeRequestId, discussionId) {
-      const isResolved = CommentsStore.state[discussionId].isResolved();
+      const discussion = CommentsStore.state[discussionId],
+            isResolved = discussion.isResolved();
+      let promise;
 
       if (isResolved) {
-        return this.unResolveAll(namespace, mergeRequestId, discussionId);
+        promise = this.unResolveAll(namespace, mergeRequestId, discussionId);
       } else {
-        return this.resolveAll(namespace, mergeRequestId, discussionId);
+        promise = this.resolveAll(namespace, mergeRequestId, discussionId);
       }
+
+      promise.then((response) => {
+        discussion.loading = false;
+
+        if (response.status === 200) {
+          const data = response.json();
+          const resolved_by = data ? data.resolved_by : null;
+
+          if (isResolved) {
+            discussion.unResolveAllNotes();
+          } else {
+            discussion.resolveAllNotes(resolved_by);
+          }
+
+          discussion.updateHeadline(data);
+        } else {
+          new Flash('An error occurred when trying to resolve a discussion. Please try again.', 'alert');
+        }
+      })
     }
 
     resolveAll(namespace, mergeRequestId, discussionId) {
@@ -51,18 +72,7 @@
       return this.discussionResource.save({
         mergeRequestId,
         discussionId
-      }, {}).then((response) => {
-        if (response.status === 200) {
-          const data = response.json();
-          const resolved_by = data ? data.resolved_by : null;
-          discussion.resolveAllNotes(resolved_by);
-          discussion.loading = false;
-
-          this.updateDiscussionHeadline(discussionId, data);
-        } else {
-          new Flash('An error occurred when trying to resolve a discussion. Please try again.', 'alert');
-        }
-      });
+      }, {});
     }
 
     unResolveAll(namespace, mergeRequestId, discussionId) {
@@ -76,31 +86,7 @@
       return this.discussionResource.delete({
         mergeRequestId,
         discussionId
-      }, {}).then((response) => {
-        if (response.status === 200) {
-          const data = response.json();
-          discussion.unResolveAllNotes();
-          discussion.loading = false;
-
-          this.updateDiscussionHeadline(discussionId, data);
-        } else {
-          new Flash('An error occurred when trying to unresolve a discussion. Please try again.', 'alert');
-        }
-      });
-    }
-
-    updateDiscussionHeadline(discussionId, data) {
-      const $discussionHeadline = $(`.discussion[data-discussion-id="${discussionId}"] .js-discussion-headline`);
-
-      if (data.discussion_headline_html) {
-        if ($discussionHeadline.length) {
-          $discussionHeadline.replaceWith(data.discussion_headline_html);
-        } else {
-          $(`.discussion[data-discussion-id="${discussionId}"] .discussion-header`).append(data.discussion_headline_html);
-        }
-      } else {
-         $discussionHeadline.remove();
-      }
+      }, {});
     }
   }