fix: Improved handling of simultaneous edits

app/components/SocketProvider.js

@@ -128,22 +128,6 @@ class SocketProvider extends React.Component<Props> {
               });
             }
           }
-
-          // TODO: Move this to the document scene once data loading
-          // has been refactored to be friendlier there.
-          if (
-            auth.user &&
-            documentId === ui.activeDocumentId &&
-            document.updatedBy.id !== auth.user.id
-          ) {
-            ui.showToast(`Document updated by ${document.updatedBy.name}`, {
-              timeout: 30 * 1000,
-              action: {
-                text: 'Refresh',
-                onClick: () => window.location.reload(),
-              },
-            });
-          }
         }
       }
 

app/models/Document.js

@@ -10,7 +10,12 @@ import Revision from 'models/Revision';
 import User from 'models/User';
 import DocumentsStore from 'stores/DocumentsStore';
 
-type SaveOptions = { publish?: boolean, done?: boolean, autosave?: boolean };
+type SaveOptions = {
+  publish?: boolean,
+  done?: boolean,
+  autosave?: boolean,
+  lastRevision?: number,
+};
 
 export default class Document extends BaseModel {
   @observable isSaving: boolean = false;
@@ -185,7 +190,7 @@ export default class Document extends BaseModel {
         id: this.id,
         title: this.title,
         text: this.text,
-        lastRevision: this.revision,
+        lastRevision: options.lastRevision,
         ...options,
       });
     } finally {

app/scenes/Document/components/Document.js

@@ -14,6 +14,7 @@ import {
   documentMoveUrl,
   documentHistoryUrl,
   documentEditUrl,
+  documentUrl,
 } from 'utils/routeHelpers';
 import { emojiToUrl } from 'utils/emoji';
 
@@ -74,11 +75,13 @@ class DocumentScene extends React.Component<Props> {
   @observable isDirty: boolean = false;
   @observable isEmpty: boolean = true;
   @observable moveModalOpen: boolean = false;
+  @observable lastRevision: number;
   @observable title: string;
 
   constructor(props) {
     super();
     this.title = props.document.title;
+    this.lastRevision = props.document.revision;
     this.loadEditor();
   }
 
@@ -86,6 +89,29 @@ class DocumentScene extends React.Component<Props> {
     this.updateIsDirty();
   }
 
+  componentDidUpdate(prevProps) {
+    const { auth, document } = this.props;
+
+    if (this.props.readOnly) {
+      this.lastRevision = document.revision;
+    } else if (prevProps.document.revision !== this.lastRevision) {
+      if (auth.user && document.updatedBy.id !== auth.user.id) {
+        this.props.ui.showToast(
+          `Document updated by ${document.updatedBy.name}`,
+          {
+            timeout: 30 * 1000,
+            action: {
+              text: 'Reload',
+              onClick: () => {
+                window.location.href = documentUrl(document);
+              },
+            },
+          }
+        );
+      }
+    }
+  }
+
   @keydown('m')
   goToMove(ev) {
     if (!this.props.readOnly) return;
@@ -174,7 +200,11 @@ class DocumentScene extends React.Component<Props> {
   handleOpenMoveModal = () => (this.moveModalOpen = true);
 
   onSave = async (
-    options: { done?: boolean, publish?: boolean, autosave?: boolean } = {}
+    options: {
+      done?: boolean,
+      publish?: boolean,
+      autosave?: boolean,
+    } = {}
   ) => {
     const { document } = this.props;
 
@@ -202,10 +232,14 @@ class DocumentScene extends React.Component<Props> {
     let isNew = !document.id;
     this.isSaving = true;
     this.isPublishing = !!options.publish;
-    const savedDocument = await document.save(options);
+
+    try {
+      const savedDocument = await document.save({
+        ...options,
+        lastRevision: this.lastRevision,
+      });
       this.isDirty = false;
-    this.isSaving = false;
-    this.isPublishing = false;
+      this.lastRevision = savedDocument.revision;
 
       if (options.done) {
         this.props.history.push(savedDocument.url);
@@ -214,6 +248,12 @@ class DocumentScene extends React.Component<Props> {
         this.props.history.push(documentEditUrl(savedDocument));
         this.props.ui.setActiveDocument(savedDocument);
       }
+    } catch (err) {
+      this.props.ui.showToast(err.message);
+    } finally {
+      this.isSaving = false;
+      this.isPublishing = false;
+    }
   };
 
   autosave = debounce(() => {