Rails电商后台实战 #

# app/models/product.rb
class Product < ApplicationRecord
  has_many :order_items
  has_many :orders, through: :order_items
  
  validates :name, presence: true
  validates :price, numericality: { greater_than: 0 }
  validates :stock, numericality: { greater_than_or_equal_to: 0 }
end

# app/models/order.rb
class Order < ApplicationRecord
  belongs_to :user
  has_many :order_items
  has_many :products, through: :order_items
  
  enum status: { pending: 0, paid: 1, shipped: 2, completed: 3, cancelled: 4 }
  
  def total_amount
    order_items.sum { |item| item.quantity * item.price }
  end
end

# app/controllers/admin/products_controller.rb
module Admin
  class ProductsController < BaseController
    def index
      @products = Product.all
    end
    
    def create
      @product = Product.new(product_params)
      
      if @product.save
        redirect_to @product, notice: '商品创建成功'
      end
    end
    
    private
    
    def product_params
      params.require(:product).permit(:name, :description, :price, :stock)
    end
  end
end