DataLoader for One-to-Many Relationships

data-loader-for-one-to-many-relationships.js

// om namah shivay

transformOneToMany(keys, rows, column) {
  const map = {};

  for (let i = 0; i < keys.length; i++) {
    map[keys[i]] = [];
  }

  for (let i = 0; i < rows.length; i++) {
    map[rows[i][column]].push(rows[i]);
  }

  return keys.map((key) => map[key]);
}