fix: Cannot duplicate document with title close to max title length

closes #1610

app/scenes/Document/components/Editor.js

@@ -4,6 +4,7 @@ import { observer } from "mobx-react";
 import * as React from "react";
 import Textarea from "react-autosize-textarea";
 import styled from "styled-components";
+import { MAX_TITLE_LENGTH } from "shared/constants";
 import parseTitle from "shared/utils/parseTitle";
 import Document from "models/Document";
 import ClickablePadding from "components/ClickablePadding";
@@ -106,7 +107,7 @@ class DocumentEditor extends React.Component<Props> {
           readOnly={readOnly}
           disabled={readOnly}
           autoFocus={!title}
-          maxLength={100}
+          maxLength={MAX_TITLE_LENGTH}
         />
         <DocumentMetaWithViews
           isDraft={isDraft}

app/stores/DocumentsStore.js

@@ -2,6 +2,7 @@
 import invariant from "invariant";
 import { find, orderBy, filter, compact, omitBy } from "lodash";
 import { observable, action, computed, runInAction } from "mobx";
+import { MAX_TITLE_LENGTH } from "shared/constants";
 import naturalSort from "shared/utils/naturalSort";
 import BaseStore from "stores/BaseStore";
 import RootStore from "stores/RootStore";
@@ -445,12 +446,17 @@ export default class DocumentsStore extends BaseStore<Document> {
 
   @action
   duplicate = async (document: Document): * => {
+    const append = " (duplicate)";
+
     const res = await client.post("/documents.create", {
       publish: !!document.publishedAt,
       parentDocumentId: document.parentDocumentId,
       collectionId: document.collectionId,
       template: document.template,
-      title: `${document.title} (duplicate)`,
+      title: `${document.title.slice(
+        0,
+        MAX_TITLE_LENGTH - append.length
+      )}${append}`,
       text: document.text,
     });
     invariant(res && res.data, "Data should be available");

server/models/Document.js

@@ -5,6 +5,7 @@ import randomstring from "randomstring";
 import Sequelize, { Transaction } from "sequelize";
 import MarkdownSerializer from "slate-md-serializer";
 import isUUID from "validator/lib/isUUID";
+import { MAX_TITLE_LENGTH } from "../../shared/constants";
 import parseTitle from "../../shared/utils/parseTitle";
 import unescape from "../../shared/utils/unescape";
 import { Collection, User } from "../models";
@@ -90,8 +91,8 @@ const Document = sequelize.define(
       type: DataTypes.STRING,
       validate: {
         len: {
-          args: [0, 100],
+          args: [0, MAX_TITLE_LENGTH],
-          msg: "Document title must be less than 100 characters",
+          msg: `Document title must be less than ${MAX_TITLE_LENGTH} characters`,
         },
       },
     },

shared/constants.js

@@ -2,3 +2,4 @@
 
 export const USER_PRESENCE_INTERVAL = 5000;
 export const MAX_AVATAR_DISPLAY = 6;
+export const MAX_TITLE_LENGTH = 100;