我有这个迁移和模型的订单和order_detail与cocoon gem。
class CreateOrders < ActiveRecord::Migration[5.0]
def change
create_table :orders do |t|
t.integer :total_price
t.timestamps
end
end
end
class CreateOrderDetails < ActiveRecord::Migration[5.0]
def change
create_table :order_details do |t|
t.integer :subtotal_price
t.integer :unit_price
t.integer :quantity
t.references :order, foreign_key: true
t.timestamps
end
end
end
class Order < ApplicationRecord
has_many :order_details, inverse_of: :order, dependent: :destroy
before_validation :calculate_order_price
accepts_nested_attributes_for :order_details, :reject_if => :all_blank, :allow_destroy => true
def calculate_order_price
order_details.each(&:calculate_order_detail_price)
self.total_price = order_details.map(&:subtotal_price).sum
end
end
class OrderDetail < ApplicationRecord
belongs_to :order
def calculate_order_detail_price
self.subtotal_price = unit_price * quantity
end
end
当我在添加或编辑嵌套字段后保存记录时,它运行良好。但是,如果我编辑以降低嵌套字段,则calculate_order_price不起作用。
如果有人知道这件事,请告诉我。
有一个选项:touch
,它将确保在更新时父项设置updated_at
(或其他字段),但它不会运行验证。然而,还有一个选项:validate
(但不完全确定它会在销毁时调用):
belongs_to :order, validate: true
否则,如果那些不起作用,你可以做类似的事情
class OrderDetail < ApplicationRecord
belongs_to :order
after_destroy :trigger_parent_validation
def trigger_parent_validation
if order.present?
order.validate
end
end
end