README

Products_categories(商品の中間テーブル)

Column	Type	Options
ID
product_id	references	null: false, foreign_key: true
category_id	references	null: false, foreign_key: true

Association

• belongs_to :product
• belongs_to :category

Categoriesテーブル

Column	Type	Options
ID
name	string	null: false
ancestry	string	null: false, index: true

Association

• has_many :products, through: :products_categories
• has_many :products_categories

Likesテーブル

Column	Type	Options
ID
user_id	references	null: false, foreign_key: true
product_id	references	null: false, foreign_key: true

Association

• belongs_to :user
• belongs_to :product