fix: Allow searching of previous document titles (#2326)

* Add migrations

* Handle previousTitles when titles is updated

* Add necessary test cases

* Use previous title while searching

* Rewrite logic to update previousTitles in beforeSave hook

* Update weights

* Update test to match new rank order

* Add tooltip to inform user on document

* Add code comment

* Remove previous title tooltip

* fix: Remove unused string, add model tests

Co-authored-by: Tom Moor <tom.moor@gmail.com>

server/models/Document.js

@@ -39,6 +39,11 @@ const beforeSave = async (doc) => {
   // ensure documents have a title
   doc.title = doc.title || "";
 
+  if (doc.previous("title") && doc.previous("title") !== doc.title) {
+    if (!doc.previousTitles) doc.previousTitles = [];
+    doc.previousTitles = uniq(doc.previousTitles.concat(doc.previous("title")));
+  }
+
   // add the current user as a collaborator on this doc
   if (!doc.collaboratorIds) doc.collaboratorIds = [];
   doc.collaboratorIds = uniq(doc.collaboratorIds.concat(doc.lastModifiedById));
@@ -70,6 +75,7 @@ const Document = sequelize.define(
         },
       },
     },
+    previousTitles: DataTypes.ARRAY(DataTypes.STRING),
     version: DataTypes.SMALLINT,
     template: DataTypes.BOOLEAN,
     editorVersion: DataTypes.STRING,