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/migrations/20210716064654-introduce-previousTitles.js

@@ -0,0 +1,13 @@
+'use strict';
+
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+   await queryInterface.addColumn("documents","previousTitles",{
+     type: Sequelize.ARRAY(Sequelize.STRING)
+   })
+  },
+
+  down: async (queryInterface, Sequelize) => {
+    await queryInterface.removeColumn("documents", "previousTitles");
+  }
+};

server/migrations/20210716071454-search-index-previousTitles.js

@@ -0,0 +1,33 @@
+'use strict';
+
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+    const searchDocument = `
+    CREATE OR REPLACE FUNCTION documents_search_trigger() RETURNS trigger AS $$
+    begin
+      new."searchVector" :=
+        setweight(to_tsvector('english', coalesce(new.title, '')),'A') ||
+        setweight(to_tsvector('english', coalesce(array_to_string(new."previousTitles", ' , '),'')),'C') ||
+        setweight(to_tsvector('english', coalesce(new.text, '')), 'B');
+      return new;
+    end
+    $$ LANGUAGE plpgsql;
+        `;
+    await queryInterface.sequelize.query(searchDocument);
+  },
+
+  down: async (queryInterface, Sequelize) => {
+    const searchDocument = `
+    CREATE OR REPLACE FUNCTION documents_search_trigger() RETURNS trigger AS $$
+    begin
+      new."searchVector" :=
+        setweight(to_tsvector('english', coalesce(new.title, '')),'A') ||
+        setweight(to_tsvector('english', coalesce(new.text, '')), 'C');
+      return new;
+    end
+    $$ LANGUAGE plpgsql;
+        `;
+    await queryInterface.sequelize.query(searchDocument);
+
+  }
+};