express school

app.js

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+'use strict'
+const express = require('express');
+const app = express();
+const bodyParser = require('body-parser');
+
+
+const index = require('./routes/index')
+const teacher = require('./routes/teacher')
+const student = require('./routes/student')
+const subject = require('./routes/subject')
+
+app.use(bodyParser.json()); 
+app.use(bodyParser.urlencoded({ extended: true })); 
+app.set('view engine', 'ejs');
+
+app.use('/',index)
+app.use('/teachers',teacher)
+app.use('/students',student)
+app.use('/subjects',subject)
+
+app.listen(3000, () => console.log('Example app listening on port 3000!'))

config/config.json

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+{
+  "development": {
+    "username": "postgres",
+    "password": "hari2018",
+    "database": "express_weekend",
+    "host": "127.0.0.1",
+    "dialect": "postgres"
+  },
+  "test": {
+    "username": "root",
+    "password": null,
+    "database": "database_test",
+    "host": "127.0.0.1",
+    "dialect": "mysql"
+  },
+  "production": {
+    "username": "root",
+    "password": null,
+    "database": "database_production",
+    "host": "127.0.0.1",
+    "dialect": "mysql"
+  }
+}

helpers/convertScore.js

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+const convertScore = function(value){
+  if(value >= 80){
+    return 'A'
+  }
+  else if (value >= 70){
+    return 'B'
+  }
+  else if(value >= 60){
+    return 'C'
+  }else{
+    return 'D'
+  }
+}
+
+module.exports = {convertScore}

migrations/20180223104959-create-teacher.js

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+'use strict';
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.createTable('Teachers', {
+      id: {
+        allowNull: false,
+        autoIncrement: true,
+        primaryKey: true,
+        type: Sequelize.INTEGER
+      },
+      first_name: {
+        type: Sequelize.STRING
+      },
+      last_name: {
+        type: Sequelize.STRING
+      },
+      createdAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      },
+      updatedAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      }
+    });
+  },
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.dropTable('Teachers');
+  }
+};

migrations/20180223105102-email.js

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+'use strict';
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    /*
+      Add altering commands here.
+      Return a promise to correctly handle asynchronicity.
+
+      Example:
+      return queryInterface.createTable('users', { id: Sequelize.INTEGER });
+    */
+   return queryInterface.addColumn('Teachers','email',Sequelize.STRING);
+  },
+
+  down: (queryInterface, Sequelize) => {
+    /*
+      Add reverting commands here.
+      Return a promise to correctly handle asynchronicity.
+
+      Example:
+      return queryInterface.dropTable('users');
+    */
+   return queryInterface.removeColumn('Teachers','email');
+  }
+};

migrations/20180223110346-create-subject.js

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+'use strict';
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.createTable('Subjects', {
+      id: {
+        allowNull: false,
+        autoIncrement: true,
+        primaryKey: true,
+        type: Sequelize.INTEGER
+      },
+      subject_name: {
+        type: Sequelize.STRING
+      },
+      createdAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      },
+      updatedAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      }
+    });
+  },
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.dropTable('Subjects');
+  }
+};

migrations/20180223110831-create-student.js

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+'use strict';
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.createTable('Students', {
+      id: {
+        allowNull: false,
+        autoIncrement: true,
+        primaryKey: true,
+        type: Sequelize.INTEGER
+      },
+      first_name: {
+        type: Sequelize.STRING
+      },
+      last_name: {
+        type: Sequelize.STRING
+      },
+      email: {
+        type: Sequelize.STRING
+      },
+      createdAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      },
+      updatedAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      }
+    });
+  },
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.dropTable('Students');
+  }
+};

migrations/20180225144044-id_subject.js

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+'use strict';
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    /*
+      Add altering commands here.
+      Return a promise to correctly handle asynchronicity.
+
+      Example:
+      return queryInterface.createTable('users', { id: Sequelize.INTEGER });
+    */
+   return queryInterface.addColumn('Teachers','id_subject',Sequelize.INTEGER);
+  },
+
+  down: (queryInterface, Sequelize) => {
+    /*
+      Add reverting commands here.
+      Return a promise to correctly handle asynchronicity.
+
+      Example:
+      return queryInterface.dropTable('users');
+    */
+   return queryInterface.removeColumn('Teachers','id_subject');
+  }
+};

migrations/20180225160722-create-student-subject.js

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+'use strict';
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.createTable('Student_subjects', {
+      id: {
+        allowNull: false,
+        autoIncrement: true,
+        primaryKey: true,
+        type: Sequelize.INTEGER
+      },
+      id_student: {
+        type: Sequelize.INTEGER
+      },
+      id_subject: {
+        type: Sequelize.INTEGER
+      },
+      createdAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      },
+      updatedAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      }
+    });
+  },
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.dropTable('Student_subjects');
+  }
+};

migrations/20180225173115-score.js

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+'use strict';
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    /*
+      Add altering commands here.
+      Return a promise to correctly handle asynchronicity.
+
+      Example:
+      return queryInterface.createTable('users', { id: Sequelize.INTEGER });
+    */
+   return queryInterface.addColumn('Student_subjects','score',Sequelize.INTEGER);
+  },
+
+  down: (queryInterface, Sequelize) => {
+    /*
+      Add reverting commands here.
+      Return a promise to correctly handle asynchronicity.
+
+      Example:
+      return queryInterface.dropTable('users');
+    */
+   return queryInterface.removeColumn('Student_subjects','score');
+  }
+};

models/index.js

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+'use strict';
+
+var fs        = require('fs');
+var path      = require('path');
+var Sequelize = require('sequelize');
+var basename  = path.basename(__filename);
+var env       = process.env.NODE_ENV || 'development';
+var config    = require(__dirname + '/../config/config.json')[env];
+var db        = {};
+
+if (config.use_env_variable) {
+  var sequelize = new Sequelize(process.env[config.use_env_variable], config);
+} else {
+  var sequelize = new Sequelize(config.database, config.username, config.password, config);
+}
+
+fs
+  .readdirSync(__dirname)
+  .filter(file => {
+    return (file.indexOf('.') !== 0) && (file !== basename) && (file.slice(-3) === '.js');
+  })
+  .forEach(file => {
+    var model = sequelize['import'](path.join(__dirname, file));
+    db[model.name] = model;
+  });
+
+Object.keys(db).forEach(modelName => {
+  if (db[modelName].associate) {
+    db[modelName].associate(db);
+  }
+});
+
+db.sequelize = sequelize;
+db.Sequelize = Sequelize;
+
+module.exports = db;

models/student.js

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+'use strict';
+const Op = require('sequelize').Op
+module.exports = (sequelize, DataTypes) => {
+  var Student = sequelize.define('Student', {
+    first_name: DataTypes.STRING,
+    last_name: DataTypes.STRING,
+    email: {
+      type:DataTypes.STRING,
+      validate:{
+        isEmail:{args:true,
+        msg:'Email format is incorrect!'},
+        isUnique :((value,next)=>{
+          Student.findAll({where:{
+            email:value,
+            id:{[Op.ne]: this.id}}})
+            .then(data=>{
+            if(data.length === 0){
+              next()
+            }else{
+              next('Email address already in used'); 
+            }
+          }).catch(err=>{
+            console.log(err)
+          })
+        })
+      }
+    }
+  });
+
+  Student.associate = function(models){
+    Student.belongsToMany(models.Subject,{through :models.Student_subject,foreignKey: 'id_student'})
+  };
+  Student.prototype.getFullname = function () {
+    return `${this.first_name} ${this.last_name}`
+  }
+  return Student;
+};

models/student_subject.js

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+'use strict';
+module.exports = (sequelize, DataTypes) => {
+  var Student_subject = sequelize.define('Student_subject', {
+    id_student: DataTypes.INTEGER,
+    id_subject: DataTypes.INTEGER,
+    score: DataTypes.INTEGER
+  });
+
+  Student_subject.associate = function(models){
+    Student_subject.belongsTo(models.Student,{foreignKey: 'id_student'})
+    Student_subject.belongsTo(models.Subject,{foreignKey: 'id_subject'})
+  };
+  return Student_subject;
+};

models/subject.js

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+'use strict';
+module.exports = (sequelize, DataTypes) => {
+  var Subject = sequelize.define('Subject', {
+    subject_name: DataTypes.STRING
+  });
+
+  Subject.associate = function(models){
+    Subject.hasMany(models.Teacher,{foreignKey: 'id_subject'})
+    Subject.belongsToMany(models.Student,{through :models.Student_subject,foreignKey: 'id_subject'})
+  };
+
+
+  return Subject;
+};

models/teacher.js

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+'use strict';
+module.exports = (sequelize, DataTypes) => {
+  var Teacher = sequelize.define('Teacher', {
+    first_name: DataTypes.STRING,
+    last_name: DataTypes.STRING,
+    email:DataTypes.STRING,
+    id_subject: DataTypes.INTEGER
+  });
+
+  Teacher.associate = function(models){
+    Teacher.belongsTo(models.Subject,{foreignKey: 'id_subject'})
+  };
+
+  return Teacher;
+};