HIECHAT/backend/src/database/migrations/20200730153237-remove-user-association-from-messages.ts

import { QueryInterface, DataTypes } from "sequelize";

module.exports = {
  up: (queryInterface: QueryInterface) => {
    return queryInterface.removeColumn("Messages", "userId");
  },

  down: (queryInterface: QueryInterface) => {
    return queryInterface.addColumn("Messages", "userId", {
      type: DataTypes.INTEGER,
      references: { model: "Users", key: "id" },
      onUpdate: "CASCADE",
      onDelete: "SET NULL"
    });
  }
};