Question

我有一个has_many：通过关联如下

Customer->
has_many :customer_materials, :dependent => :destroy
has_many :materials, :through => :customer_materials

CustomerMaterial -> #This is the lookout table for a price attribute
belongs_to :customer
belongs_to :material

Material ->
has_many :customer_materials, :dependent => :destroy
has_many :customers, :through => :customer_materials

并非所有客户都通过查找表获得此类自定义定价。只有在检查了客户的custom_price布尔值时才使用查找表。如果custom_price布尔值为false，我使用Material表中price属性跟踪的默认价格。

当我编辑客户并取消选中custom_price复选框时，我想继续并在查找表上触发级联删除。这是我的控制器更新方法。如何根据custom_price属性修改方法以进行条件更新？

def update
  @customer = Customer.find(params[:id])
  if @customer.update_attributes(customer_params)
    flash[:success] = "Record Updated Successfully"
    redirect_to customers_url
  else
    flash.now[:error] = @customer.errors.full_messages.to_sentence
    render 'edit'
  end
end

Answer 1

class Customer < ActiveRecord::Base
  after_save :delete_custom_prices, :unless => Proc.new {|model| model.custom_price? }

  def delete_custom_prices
    customer_materials.delete_all
  end
end

Rails 4 has_many：通过基于复选框值的级联删除

1 个答案: