add multicorrect flag to questions

framework/serializers/questions.js

@@ -31,6 +31,7 @@ module.exports = function (included = [], type, config) {
       'difficulty',
       'positiveScore',
       'negativeScore',
+      'multicorrect',
       'user', 
       'choices', 
       'tags',

migrations/20200611143525-addMultipleCorrectFlag.js

@@ -0,0 +1,21 @@
+'use strict';
+
+module.exports = {
+  async up (queryInterface, Sequelize) {
+    await queryInterface.addColumn('questions', 'multicorrect', {
+      type: Sequelize.BOOLEAN,
+      allowNull: false,
+      defaultValue: false
+    })
+    // Migrate existing data
+    return queryInterface.query(`
+      update questions
+          set multicorrect = array_length("correctAnswers", 1) > 1
+      where array_length("correctAnswers", 1) is not null;
+    `)
+
+  },
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.removeColumn('questions', 'multicorrect')
+  }
+};

models/questions.js

@@ -32,6 +32,11 @@ module.exports = (sequelize, DataTypes) => {
       type: DataTypes.INTEGER,
       allowNull: false,
       defaultValue: 0
+    },
+    multicorrect: {
+      type: DataTypes.BOOLEAN,
+      allowNull: false,
+      defaultValue: false
     }
   }, {
     paranoid: true

routes/api/questions/controller.js

@@ -43,6 +43,16 @@ class QuestionsController extends BaseController {
     })
 
   }
+
+  async onAfterCreate(req, model) {
+    model.multicorrect = model.correctAnswers.length > 1 
+    return model.save()
+  }
+
+  async onAfterUpdate(req, model) {
+    model.multicorrect = model.correctAnswers.length > 1 || model.multicorrect
+    return model.save()
+  }
 
   async handleUpdateById(req, res) {
     const modelObj = await this.deserialize(req.body)