Agrha

app.js

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+const express = require('express')
+const body = require('body-parser')
+const app = express()
+
+let index = require('./routers/index')
+let teacher = require ('./routers/teachers')
+let student = require ('./routers/students')
+let subject = require ('./routers/subject')
+
+app.set('views', './views')
+app.set('view engine', 'ejs')
+app.use(body.json())
+app.use(body.urlencoded({ extended: false }))
+
+app.use('/teachers',teacher)
+app.use('/students',student)
+app.use('/subjects',subject)
+app.use('/',index)
+
+
+
+
+
+
+
+app.listen(3000, function(){
+  console.log('AYE AYE CAPT:3000');
+})

config/config.json

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+{
+  "development": {
+    "username": "postgres",
+    "password": "postgres",
+    "database": "express_from_scratch",
+    "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"
+  }
+}

migrations/20180223105542-create-teachers.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
+      },
+      email: {
+        type: Sequelize.STRING
+      },
+      createdAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      },
+      updatedAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      }
+    });
+  },
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.dropTable('Teachers');
+  }
+};

migrations/20180225222846-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
+      },
+      name: {
+        type: Sequelize.STRING
+      },
+      createdAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      },
+      updatedAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      }
+    });
+  },
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.dropTable('Subjects');
+  }
+};

migrations/20180225223023-create-score.js

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+'use strict';
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.createTable('Scores', {
+      id: {
+        allowNull: false,
+        autoIncrement: true,
+        primaryKey: true,
+        type: Sequelize.INTEGER
+      },
+      score: {
+        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('Scores');
+  }
+};

migrations/20180225223223-create-students.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
+      },
+      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/20180225223310-addColumn.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');
+  }
+};

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/score.js

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

models/students.js

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+'use strict';
+module.exports = (sequelize, DataTypes) => {
+  var Students = sequelize.define('Students', {
+    name: DataTypes.STRING,
+    email: DataTypes.STRING
+  }, {});
+  Students.associate = models=>{
+    Students.belongsToMany(models.Subject,{
+      through:'Score',
+      foreignKey:'id_student'
+    })
+  }
+  return Students;
+};

models/subject.js

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+'use strict';
+module.exports = (sequelize, DataTypes) => {
+  var Subject = sequelize.define('Subject', {
+    name: DataTypes.STRING
+  }, {});
+  Subject.associate = function (models) {
+    Subject.hasMany(models.Teachers,{
+      foreignKey:'id_subject'
+    })
+    Subject.belongsToMany(models.Students,{
+      through:'Score',
+      foreignKey:'id_subject'
+    })
+  };
+  return Subject;
+};

models/teachers.js

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