Category model and controllers

models/associateModels.js

@@ -0,0 +1,13 @@
+const Category = require('./Category');
+const Bookmark = require('./Bookmark');
+
+const associateModels = () => {
+  // Category <> Bookmark
+  Bookmark.belongsTo(Category, { foreignKey: 'categoryId' });
+  Category.hasMany(Bookmark, {
+    as: 'bookmarks',
+    foreignKey: 'categoryId'
+  });
+}
+
+module.exports = associateModels;