text: // import models
  const Product = require('./Product');
  const Category = require('./Category');
  const Tag = require('./Tag');
  const ProductTag = require('./ProductTag');
  
  // Products belongsTo Category
  Product.belongsTo(Category, {
    foreignKey: 'categoryID', // sets relationship/association link using category id
  });
  // Categories have many Products
  Category.hasMany(Product, {
    foreignKey: 'categoryID', // sets relationship/association link using category id
  });
  // Products belongToMany Tags (through ProductTag)
  Product.belongsToMany(Tag, {
    through: ProductTag,
    foreignKey: 'productID', // sets relationship/association link using product id
  });
  // Tags belongToMany Products (through ProductTag)
  Tag.belongsToMany(Product, {
    through: ProductTag,
    foreignKey: 'tagID', // sets relationship/association link using tagID
  });
  module.exports = {
    Product,
    Category,
    Tag,
    ProductTag,
  };
  