text: // import models
  const Product = require('./Product');   /* requiring the correct file paths */
  const Category = require('./Category');
  const Tag = require('./Tag');
  const ProductTag = require('./ProductTag');
  
  // Products belongsTo Category
  
  Product.BelongsTo(Category, {   /* inputting foreign keys */
    foreignKey: 'category_id',
  });
  // Categories have many Products
  Category.hasMany(Product, {
    foreignKey: 'category_id',
  });
  // Products belongToMany Tags (through ProductTag)
  Product.BelongsToMany(Tag, {
    foreignKey: 'tag_id',
  });
  // Tags belongToMany Products (through ProductTag)
  Tag.BelongsToMany(Product, {
    foreignKey: 'tag_id',
  });
  
  module.exports = {    /* exporting the different models */
    Product,
    Category,
    Tag,
    ProductTag,
  };
  