如何使用循环删除特定记录的所有关联记录？ （不使用依赖）

Question

如何使用循环删除特定记录的所有关联记录？ 比如当我删除一个特定的卖家时，他们的相关记录应该被删除。 例如。当一个卖家被删除时，他们的产品、客户、SellerMarketplace 应该被删除。（而不是 Marketplace 应该被删除。）

class Seller < ActiveRecord::Base
    has_many :products
    has_many :customers
    has_many :seller_marketplaces
    has_many :marketplaces through: :seller_marketplaces
end

Answer 1

您的模型应该是：-

class Seller < ActiveRecord::Base
    has_many :products
    has_many :customers
    has_many :seller_marketplaces
    has_many :marketplaces through: :seller_marketplaces
end

假设您有一个卖家

  def destroy
    seller = Seller.find(params[:id])
    products = seller.products
    customers =  seller.customers
    seller_marketplaces = seller.seller_marketplaces
    if seller.destroy
      #delete products
      products.each do |product|
        product.destroy
      end
      #delete customers
      customers.each do |customer|
        customer.destroy
      end
      #delete seller_marketplaces
      seller_marketplaces.each do |mp|
        mp.destroy
      end
    end
  end

Answer 2

您可以使用after_destroy回调

class Seller < ActiveRecord::Base
 has_many :products
 has_many :customers
 has_many :seller_marketplaces
 has_many :marketplaces through: :seller_marketplaces
 after_destroy :destroy_related_records

 def destroy_related_records
  #delete products
  products.each do |product|
    product.destroy
  end

  #delete customers
  customers.each do |customer|
    customer.destroy
  end

  #delete seller_marketplaces
  seller_marketplaces.each do |seller_marketplace|
    seller_marketplace.destroy
  end
 end
end