33797/backend/src/db/seeders/20231127130745-sample-data.js

const db = require('../models');
const Users = db.users;

const Skills = db.skills;

const Transactions = db.transactions;

const SkillsData = [
  {
    name: 'Web Development',

    description: 'Learn to build websites using HTML, CSS, and JavaScript.',

    // type code here for "relation_many" field

    // type code here for "relation_many" field
  },

  {
    name: 'Data Science',

    description: 'Introduction to data analysis and machine learning.',

    // type code here for "relation_many" field

    // type code here for "relation_many" field
  },

  {
    name: 'Graphic Design',

    description: 'Basics of design principles and Adobe tools.',

    // type code here for "relation_many" field

    // type code here for "relation_many" field
  },
];

const TransactionsData = [
  {
    // type code here for "relation_one" field

    // type code here for "relation_one" field

    // type code here for "relation_one" field

    start_date: new Date('2023-10-01T10:00:00Z'),

    end_date: new Date('2023-10-01T12:00:00Z'),

    amount: 50,
  },

  {
    // type code here for "relation_one" field

    // type code here for "relation_one" field

    // type code here for "relation_one" field

    start_date: new Date('2023-10-02T14:00:00Z'),

    end_date: new Date('2023-10-02T16:00:00Z'),

    amount: 75,
  },

  {
    // type code here for "relation_one" field

    // type code here for "relation_one" field

    // type code here for "relation_one" field

    start_date: new Date('2023-10-03T09:00:00Z'),

    end_date: new Date('2023-10-03T11:00:00Z'),

    amount: 60,
  },
];

// Similar logic for "relation_many"

// Similar logic for "relation_many"

// Similar logic for "relation_many"

async function associateTransactionWithLearner() {
  const relatedLearner0 = await Users.findOne({
    offset: Math.floor(Math.random() * (await Users.count())),
  });
  const Transaction0 = await Transactions.findOne({
    order: [['id', 'ASC']],
    offset: 0,
  });
  if (Transaction0?.setLearner) {
    await Transaction0.setLearner(relatedLearner0);
  }

  const relatedLearner1 = await Users.findOne({
    offset: Math.floor(Math.random() * (await Users.count())),
  });
  const Transaction1 = await Transactions.findOne({
    order: [['id', 'ASC']],
    offset: 1,
  });
  if (Transaction1?.setLearner) {
    await Transaction1.setLearner(relatedLearner1);
  }

  const relatedLearner2 = await Users.findOne({
    offset: Math.floor(Math.random() * (await Users.count())),
  });
  const Transaction2 = await Transactions.findOne({
    order: [['id', 'ASC']],
    offset: 2,
  });
  if (Transaction2?.setLearner) {
    await Transaction2.setLearner(relatedLearner2);
  }
}

async function associateTransactionWithInstructor() {
  const relatedInstructor0 = await Users.findOne({
    offset: Math.floor(Math.random() * (await Users.count())),
  });
  const Transaction0 = await Transactions.findOne({
    order: [['id', 'ASC']],
    offset: 0,
  });
  if (Transaction0?.setInstructor) {
    await Transaction0.setInstructor(relatedInstructor0);
  }

  const relatedInstructor1 = await Users.findOne({
    offset: Math.floor(Math.random() * (await Users.count())),
  });
  const Transaction1 = await Transactions.findOne({
    order: [['id', 'ASC']],
    offset: 1,
  });
  if (Transaction1?.setInstructor) {
    await Transaction1.setInstructor(relatedInstructor1);
  }

  const relatedInstructor2 = await Users.findOne({
    offset: Math.floor(Math.random() * (await Users.count())),
  });
  const Transaction2 = await Transactions.findOne({
    order: [['id', 'ASC']],
    offset: 2,
  });
  if (Transaction2?.setInstructor) {
    await Transaction2.setInstructor(relatedInstructor2);
  }
}

async function associateTransactionWithSkill() {
  const relatedSkill0 = await Skills.findOne({
    offset: Math.floor(Math.random() * (await Skills.count())),
  });
  const Transaction0 = await Transactions.findOne({
    order: [['id', 'ASC']],
    offset: 0,
  });
  if (Transaction0?.setSkill) {
    await Transaction0.setSkill(relatedSkill0);
  }

  const relatedSkill1 = await Skills.findOne({
    offset: Math.floor(Math.random() * (await Skills.count())),
  });
  const Transaction1 = await Transactions.findOne({
    order: [['id', 'ASC']],
    offset: 1,
  });
  if (Transaction1?.setSkill) {
    await Transaction1.setSkill(relatedSkill1);
  }

  const relatedSkill2 = await Skills.findOne({
    offset: Math.floor(Math.random() * (await Skills.count())),
  });
  const Transaction2 = await Transactions.findOne({
    order: [['id', 'ASC']],
    offset: 2,
  });
  if (Transaction2?.setSkill) {
    await Transaction2.setSkill(relatedSkill2);
  }
}

module.exports = {
  up: async (queryInterface, Sequelize) => {
    await Skills.bulkCreate(SkillsData);

    await Transactions.bulkCreate(TransactionsData);

    await Promise.all([
      // Similar logic for "relation_many"

      // Similar logic for "relation_many"

      // Similar logic for "relation_many"

      await associateTransactionWithLearner(),

      await associateTransactionWithInstructor(),

      await associateTransactionWithSkill(),
    ]);
  },

  down: async (queryInterface, Sequelize) => {
    await queryInterface.bulkDelete('skills', null, {});

    await queryInterface.bulkDelete('transactions', null, {});
  },
};