feat(challenge_1): design database and gen model

code/.gitignore

+node_modules/
+.env
+dist/
+build/
+*.log
\ No newline at end of file

code/index.js

+const express = require('express')
+const app = express()
+const port = 3000
+
+app.get('/', (req, res) => {
+  res.send('Hello World!')
+})
+
+app.listen(port, () => {
+  console.log(`Example app listening on port ${port}`)
+})

code/models/classes.js

+const Sequelize = require('sequelize');
+module.exports = function(sequelize, DataTypes) {
+  return sequelize.define('classes', {
+    id: {
+      type: DataTypes.UUID,
+      allowNull: false,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    name: {
+      type: DataTypes.TEXT,
+      allowNull: true
+    },
+    description: {
+      type: DataTypes.TEXT,
+      allowNull: true
+    },
+    created_by: {
+      type: DataTypes.UUID,
+      allowNull: true
+    },
+    updated_by: {
+      type: DataTypes.UUID,
+      allowNull: true
+    },
+    course_id: {
+      type: DataTypes.UUID,
+      allowNull: true,
+      references: {
+        model: 'courses',
+        key: 'id'
+      }
+    },
+    status: {
+      type: DataTypes.STRING(50),
+      allowNull: true
+    }
+  }, {
+    sequelize,
+    tableName: 'classes',
+    schema: 'public',
+    timestamps: true,
+    indexes: [
+      {
+        name: "classes_pkey",
+        unique: true,
+        fields: [
+          { name: "id" },
+        ]
+      },
+    ]
+  });
+};

code/models/courses.js

+const Sequelize = require('sequelize');
+module.exports = function(sequelize, DataTypes) {
+  return sequelize.define('courses', {
+    id: {
+      type: DataTypes.UUID,
+      allowNull: false,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    name: {
+      type: DataTypes.TEXT,
+      allowNull: true
+    },
+    description: {
+      type: DataTypes.TEXT,
+      allowNull: true
+    },
+    created_by: {
+      type: DataTypes.UUID,
+      allowNull: true
+    },
+    status: {
+      type: DataTypes.STRING(50),
+      allowNull: true
+    }
+  }, {
+    sequelize,
+    tableName: 'courses',
+    schema: 'public',
+    timestamps: true,
+    indexes: [
+      {
+        name: "courses_pkey",
+        unique: true,
+        fields: [
+          { name: "id" },
+        ]
+      },
+    ]
+  });
+};

code/models/enrollments.js

+const Sequelize = require('sequelize');
+module.exports = function(sequelize, DataTypes) {
+  return sequelize.define('enrollments', {
+    id: {
+      type: DataTypes.UUID,
+      allowNull: false,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    user_id: {
+      type: DataTypes.UUID,
+      allowNull: true,
+      references: {
+        model: 'users',
+        key: 'id'
+      }
+    },
+    class_id: {
+      type: DataTypes.UUID,
+      allowNull: true,
+      references: {
+        model: 'classes',
+        key: 'id'
+      }
+    },
+    status: {
+      type: DataTypes.STRING(50),
+      allowNull: true
+    }
+  }, {
+    sequelize,
+    tableName: 'enrollments',
+    schema: 'public',
+    timestamps: true
+  });
+};

code/models/init-models.js

+var DataTypes = require("sequelize").DataTypes;
+var _classes = require("./classes");
+var _courses = require("./courses");
+var _enrollments = require("./enrollments");
+var _roles = require("./roles");
+var _user_auth = require("./user_auth");
+var _users = require("./users");
+
+function initModels(sequelize) {
+  var classes = _classes(sequelize, DataTypes);
+  var courses = _courses(sequelize, DataTypes);
+  var enrollments = _enrollments(sequelize, DataTypes);
+  var roles = _roles(sequelize, DataTypes);
+  var user_auth = _user_auth(sequelize, DataTypes);
+  var users = _users(sequelize, DataTypes);
+
+  enrollments.belongsTo(classes, { as: "class", foreignKey: "class_id"});
+  classes.hasMany(enrollments, { as: "enrollments", foreignKey: "class_id"});
+  classes.belongsTo(courses, { as: "course", foreignKey: "course_id"});
+  courses.hasMany(classes, { as: "classes", foreignKey: "course_id"});
+  users.belongsTo(roles, { as: "role", foreignKey: "role_id"});
+  roles.hasMany(users, { as: "users", foreignKey: "role_id"});
+  enrollments.belongsTo(users, { as: "user", foreignKey: "user_id"});
+  users.hasMany(enrollments, { as: "enrollments", foreignKey: "user_id"});
+  user_auth.belongsTo(users, { as: "user", foreignKey: "user_id"});
+  users.hasMany(user_auth, { as: "user_auths", foreignKey: "user_id"});
+
+  return {
+    classes,
+    courses,
+    enrollments,
+    roles,
+    user_auth,
+    users,
+  };
+}
+module.exports = initModels;
+module.exports.initModels = initModels;
+module.exports.default = initModels;

code/models/roles.js

+const Sequelize = require('sequelize');
+module.exports = function(sequelize, DataTypes) {
+  return sequelize.define('roles', {
+    id: {
+      type: DataTypes.UUID,
+      allowNull: false,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    name: {
+      type: DataTypes.TEXT,
+      allowNull: false
+    },
+    description: {
+      type: DataTypes.TEXT,
+      allowNull: true
+    },
+    created_by: {
+      type: DataTypes.UUID,
+      allowNull: true
+    }
+  }, {
+    sequelize,
+    tableName: 'roles',
+    schema: 'public',
+    timestamps: true,
+    indexes: [
+      {
+        name: "roles_pkey",
+        unique: true,
+        fields: [
+          { name: "id" },
+        ]
+      },
+    ]
+  });
+};

code/models/user_auth.js

+const Sequelize = require('sequelize');
+module.exports = function(sequelize, DataTypes) {
+  return sequelize.define('user_auth', {
+    id: {
+      type: DataTypes.UUID,
+      allowNull: false,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    user_id: {
+      type: DataTypes.UUID,
+      allowNull: true,
+      references: {
+        model: 'users',
+        key: 'id'
+      }
+    },
+    password_hash: {
+      type: DataTypes.TEXT,
+      allowNull: true
+    }
+  }, {
+    sequelize,
+    tableName: 'user_auth',
+    schema: 'public',
+    timestamps: true,
+    indexes: [
+      {
+        name: "user_auth_pkey",
+        unique: true,
+        fields: [
+          { name: "id" },
+        ]
+      },
+    ]
+  });
+};

code/models/users.js

+const Sequelize = require('sequelize');
+module.exports = function(sequelize, DataTypes) {
+  return sequelize.define('users', {
+    id: {
+      type: DataTypes.UUID,
+      allowNull: false,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    name: {
+      type: DataTypes.TEXT,
+      allowNull: false
+    },
+    date_of_birth: {
+      type: DataTypes.DATE,
+      allowNull: true
+    },
+    phone: {
+      type: DataTypes.TEXT,
+      allowNull: true
+    },
+    email: {
+      type: DataTypes.STRING(255),
+      allowNull: true
+    },
+    address: {
+      type: DataTypes.TEXT,
+      allowNull: true
+    },
+    role_id: {
+      type: DataTypes.UUID,
+      allowNull: true,
+      references: {
+        model: 'roles',
+        key: 'id'
+      }
+    }
+  }, {
+    sequelize,
+    tableName: 'users',
+    schema: 'public',
+    timestamps: true,
+    indexes: [
+      {
+        name: "users_pkey",
+        unique: true,
+        fields: [
+          { name: "id" },
+        ]
+      },
+    ]
+  });
+};

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+      "license": "ISC",
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+}

code/package.json

+{
+  "name": "code",
+  "version": "1.0.0",
+  "description": "",
+  "license": "ISC",
+  "author": "",
+  "type": "commonjs",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "dependencies": {
+    "express": "^5.2.1",
+    "pg": "^8.20.0",
+    "pg-hstore": "^2.3.4",
+    "sequelize": "^6.37.8",
+    "sequelize-auto": "^0.8.8"
+  }
+}

docker-compose.yml

+version: '3.5'
+
+services:
+  app:
+    container_name: db-challenge
+    image: postgres:17
+    restart: always
+
+    environment:  
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: 123456
+      POSTGRES_DB: challenge_db
+
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+
+    ports:
+      - "2550:5432"
+
+volumes:
+  postgres_data:
\ No newline at end of file

erd.drawio

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+            <mxPoint x="-460" y="750" as="targetPoint" />
+          </mxGeometry>
+        </mxCell>
+        <mxCell id="6W2G5BJYrON_X3-Y-d_I-120" edge="1" parent="1" source="6W2G5BJYrON_X3-Y-d_I-101" style="edgeStyle=entityRelationEdgeStyle;endArrow=ERzeroToMany;startArrow=ERone;endFill=1;startFill=0;entryX=1;entryY=0.5;entryDx=0;entryDy=0;exitX=0;exitY=0.5;exitDx=0;exitDy=0;" target="C-vyLk0tnHw3VtMMgP7b-14" value="">
+          <mxGeometry height="100" relative="1" width="100" as="geometry">
+            <mxPoint x="480" y="360" as="sourcePoint" />
+            <mxPoint x="330" y="500" as="targetPoint" />
+          </mxGeometry>
+        </mxCell>
+      </root>
+    </mxGraphModel>
+  </diagram>
+</mxfile>

init.sql

+CREATE TABLE classes (
+    id uuid DEFAULT gen_random_uuid() NOT NULL,
+    name text,
+    description text,
+    created_at timestamp with time zone DEFAULT now(),
+    created_by uuid,
+    updated_at timestamp with time zone,
+    updated_by uuid,
+    course_id uuid,
+    status character varying(50)
+);
+
+CREATE TABLE courses (
+    id uuid DEFAULT gen_random_uuid() NOT NULL,
+    name text,
+    description text,
+    created_at timestamp with time zone DEFAULT now(),
+    created_by uuid,
+    status character varying(50)
+);
+
+CREATE TABLE enrollments (
+    id uuid DEFAULT gen_random_uuid() NOT NULL,
+    user_id uuid,
+    class_id uuid,
+    created_at timestamp with time zone DEFAULT now(),
+    status character varying(50)
+);
+
+CREATE TABLE roles (
+    id uuid DEFAULT gen_random_uuid() NOT NULL,
+    name text NOT NULL,
+    description text,
+    created_at timestamp with time zone DEFAULT now(),
+    created_by uuid
+);
+
+CREATE TABLE user_auth (
+    id uuid DEFAULT gen_random_uuid() NOT NULL,
+    user_id uuid,
+    password_hash text,
+    created_at timestamp with time zone DEFAULT now()
+);
+
+CREATE TABLE users (
+    id uuid DEFAULT gen_random_uuid() NOT NULL,
+    name text NOT NULL,
+    date_of_birth timestamp without time zone,
+    phone text,
+    email character varying(255),
+    address text,
+    created_at timestamp with time zone DEFAULT now(),
+    role_id uuid
+);
+
+
+ALTER TABLE classes
+ADD CONSTRAINT classes_pkey 
+PRIMARY KEY (id);
+
+ALTER TABLE courses
+ADD CONSTRAINT courses_pkey 
+PRIMARY KEY (id);
+
+ALTER TABLE roles
+ADD CONSTRAINT roles_pkey 
+PRIMARY KEY (id);
+
+ALTER TABLE user_auth
+ADD CONSTRAINT user_auth_pkey 
+PRIMARY KEY (id);
+
+ALTER TABLE users
+ADD CONSTRAINT users_pkey
+PRIMARY KEY (id);
+
+ALTER TABLE enrollments
+ADD CONSTRAINT enrollment_user 
+FOREIGN KEY (user_id) 
+REFERENCES users(id);
+
+ALTER TABLE classes
+ADD CONSTRAINT fk_classes_course 
+FOREIGN KEY (course_id) 
+REFERENCES courses(id);
+
+ALTER TABLE enrollments
+ADD CONSTRAINT fk_enrollment_class 
+FOREIGN KEY (class_id) 
+REFERENCES classes(id);
+
+ALTER TABLE user_auth
+ADD CONSTRAINT fk_user 
+FOREIGN KEY (user_id) 
+REFERENCES users(id);
+
+ALTER TABLE users
+ADD CONSTRAINT users_role 
+FOREIGN KEY (role_id) 
+REFERENCES roles(id);
\ No newline at end of file

sample_data.sql

+-- 1. Thêm 10 Role mẫu (Cần có Role trước để gán cho User)
+INSERT INTO roles (id, name, description, created_at)
+SELECT 
+    gen_random_uuid(), 
+    'Role Name ' || i, 
+    'Description for role ' || i, 
+    NOW()
+FROM generate_series(1, 10) AS i;
+
+-- 2. Thêm 10 User mẫu (Lấy ngẫu nhiên role_id từ bảng roles)
+INSERT INTO users (id, name, date_of_birth, phone, email, address, role_id, created_at)
+SELECT 
+    gen_random_uuid(), 
+    'User Name ' || i, 
+    '1990-01-01'::timestamptz + (i || ' months')::interval,
+    '090123456' || (i-1),
+    'user' || i || '@example.com',
+    'Address ' || i,
+    (SELECT id FROM roles ORDER BY random() LIMIT 1), -- Lấy ngẫu nhiên 1 role
+    NOW()
+FROM generate_series(1, 10) AS i;
+
+-- 3. Thêm 10 Auth mẫu (Liên kết 1-1 hoặc 1-n với Users)
+INSERT INTO user_auth (id, user_id, password_hash, created_at)
+SELECT 
+    gen_random_uuid(), 
+    u.id, 
+    'hash_password_sample_' || row_number() OVER (), 
+    NOW()
+FROM (SELECT id FROM users LIMIT 10) u;
+
+-- 4. Thêm 10 Course mẫu
+INSERT INTO courses (id, name, description, status, created_at)
+SELECT 
+    gen_random_uuid(), 
+    'Course ' || i, 
+    'Description for course ' || i, 
+    'active', 
+    NOW()
+FROM generate_series(1, 10) AS i;
+
+-- 5. Thêm 10 Class mẫu (Liên kết với Courses)
+INSERT INTO classes (id, name, description, course_id, status, created_at)
+SELECT 
+    gen_random_uuid(), 
+    'Class ' || i, 
+    'Description for class ' || i, 
+    (SELECT id FROM courses ORDER BY random() LIMIT 1),
+    'opened',
+    NOW()
+FROM generate_series(1, 10) AS i;
+
+-- 6. Thêm 10 Enrollment mẫu (Kết nối User và Class)
+INSERT INTO enrollments (id, user_id, class_id, created_at)
+SELECT 
+    gen_random_uuid(), 
+    (SELECT id FROM users ORDER BY random() LIMIT 1),
+    (SELECT id FROM classes ORDER BY random() LIMIT 1),
+    NOW()
+FROM generate_series(1, 10) AS i;
\ No newline at end of file