Change model style.

models/rating_calculation.js

@@ -26,13 +26,7 @@ const Contest = syzoj.model('contest');
 
 let model = db.define('rating_calculation', {
     id: { type: Sequelize.INTEGER, primaryKey: true, autoIncrement: true },
-    contest_id: {
-        type: Sequelize.INTEGER,
-        references: {
-            model: 'contest',
-            key: 'id'
-        }
-    }
+    contest_id: { type: Sequelize.INTEGER }
 }, {
         timestamps: false,
         tableName: 'rating_calculation',
@@ -45,13 +39,8 @@ let model = db.define('rating_calculation', {
 
 let Model = require('./common');
 class RatingCalculation extends Model {
-    static async create(contest_id, newRatingList) {
-        const newItem = await RatingCalculation.model.create({ contest_id: contest_id });
-        const RatingHistory = syzoj.model('rating_history');
-        for (const val of newRatingList) {
-            await RatingHistory.create(newItem.id, val.user_id, val.rating);
-        }
-        return newItem;
+    static async create(contest_id) {
+        return RatingCalculation.fromRecord(RatingCalculation.model.create({ contest_id: contest_id }));
     }
 
     async loadRelationships() {

models/rating_history.js

@@ -24,22 +24,8 @@ const User = syzoj.model('user');
 let db = syzoj.db;
 
 let model = db.define('rating_history', {
-    rating_calculation_id: {
-        type: Sequelize.INTEGER,
-        primaryKey: true,
-        references: {
-            model: 'rating_calculation',
-            key: 'id'
-        }
-    },
-    user_id: {
-        type: Sequelize.INTEGER,
-        primaryKey: true,
-        references: {
-            model: 'user',
-            key: 'id'
-        }
-    },
+    rating_calculation_id: { type: Sequelize.INTEGER, primaryKey: true },
+    user_id: { type: Sequelize.INTEGER, primaryKey: true },
     rating_after: { type: Sequelize.INTEGER },
 }, {
         timestamps: false,
@@ -57,15 +43,11 @@ let model = db.define('rating_history', {
 let Model = require('./common');
 class RatingHistory extends Model {
     static async create(rating_calculation_id, user_id, rating) {
-        const newRecord = await RatingHistory.model.create({
+        return RatingHistory.fromRecord(RatingHistory.model.build({
             rating_calculation_id: rating_calculation_id,
             user_id: user_id,
             rating_after: rating
-        });
-        await newRecord.loadRelationShips();
-        newRecord.user.rating = rating;
-        await newRecord.user.save();
-        return newRecord;
+        }));
     }
 
     async loadRelationships() {