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database.js
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database.js
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import { Sequelize, DataTypes, Model } from 'sequelize'
import db_config from './.database_config.js'
const sequelize = new Sequelize(db_config.name, db_config.user, db_config.pass, {
...db_config.options,
define: {
underscored: true,
}
})
class Course extends Model {
// can declare methods in here!!
}
Course.init({
id: {
type: DataTypes.INTEGER,
unique: true,
allowNull: false,
autoIncrement: true,
primaryKey: true,
},
code: {
type: DataTypes.STRING,
unique: true,
allowNull: false,
},
name: {
type: DataTypes.STRING,
allowNull: false,
},
credits: {
type: DataTypes.INTEGER,
allowNull: false,
},
requiredCredits: {
type: DataTypes.INTEGER,
allowNull: false,
},
department: {
type: DataTypes.STRING,
allowNull: false,
},
level: {
type: DataTypes.STRING,
allowNull: false,
},
}, { sequelize })
class Prerequisite extends Model {
// can declare methods in here!!
}
Prerequisite.init({
prerequisiteId: {
type: DataTypes.INTEGER,
allowNull: false,
references: {
model: Course,
key: 'id',
},
primaryKey: true,
},
courseId: {
type: DataTypes.INTEGER,
allowNull: false,
references: {
model: Course,
key: 'id',
},
primaryKey: true,
}
}, {
sequelize,
timestamps: false,
})
class CourseHistory extends Model {
// can declare methods in here!!
}
CourseHistory.init({
id: {
type: DataTypes.INTEGER,
unique: true,
allowNull: false,
autoIncrement: true,
primaryKey: true,
},
courseId: {
type: DataTypes.INTEGER,
allowNull: false,
references: {
model: Course,
key: 'id',
}
},
year: {
type: DataTypes.INTEGER,
allowNull: false,
},
first_semester_enrollment: {
type: DataTypes.INTEGER
},
second_semester_enrollment: {
type: DataTypes.INTEGER
},
}, {
sequelize,
timestamps: false,
})
async function initialize() {
try {
await sequelize.authenticate()
// Should be done with migrations
await sequelize.sync({ alter: true })
console.log('Database synchronized')
} catch (err) {
console.error(err)
}
}
initialize()