模型 - Purchaseorder，Purchaseorderadjustments，Productvariant，Location，Locationinventory
我将库存存储在Locationinventory中，该库存存有location_id，productvariant_id和数量。
当我想创建一个购买订单时，就会出现这种情况。我使用purchaseorderadjustments作为购买订单的嵌套属性。购买订单has_many purchaseorderadjustments存储productvariant_id和数量。
我在使用过滤器之前创建，更新和销毁相关的locationinventory记录。现在一切都运行良好，除了你可以从没有它们的位置删除项目，数量只是负数。我想验证“From Location”是否有足够的库存产品变量转移到“To Location”。
我做错了吗？谢谢！
Rails 3.2.14
Purchaseorder.rb
class Purchaseorder < ActiveRecord::Base
attr_accessible :fromlocation_id, :status_id, :tolocation_id, :user_id, :purchaseorderadjustments_attributes
belongs_to :user
belongs_to :status
belongs_to :fromlocation, :class_name => "Location", :foreign_key => :fromlocation_id
belongs_to :tolocation, :class_name => "Location", :foreign_key => :tolocation_id
has_many :purchaseorderadjustments, :dependent => :destroy
accepts_nested_attributes_for :purchaseorderadjustments, allow_destroy: true
end
Purchaseorderadjustment.rb
class Purchaseorderadjustment < ActiveRecord::Base
attr_accessible :adjustmenttype_id, :productvariant_id, :purchaseorder_id, :quantity
belongs_to :purchaseorder
belongs_to :productvariant
belongs_to :adjustmenttype
validates_presence_of :quantity, :message => "You need a quantity for each product."
# On creation of a purchaseorderadjustment go ahead and create the record for locationinventory
before_create :create_locationinventory
def create_locationinventory
# Get some info before updating the locationinventory
if fromlocationinventory = Locationinventory.find(:first, conditions: { :location_id => purchaseorder.fromlocation_id, :productvariant_id => productvariant_id })
fromlocation_current_quantity = fromlocationinventory.quantity
end
if tolocationinventory = Locationinventory.find(:first, conditions: { :location_id => purchaseorder.tolocation_id, :productvariant_id => productvariant_id })
tolocation_current_quantity = tolocationinventory.quantity
end
# Create or update the from locationinventory
unless fromlocationinventory.nil?
fromlocationinventory.quantity = fromlocation_current_quantity - quantity
fromlocationinventory.save
else
new_fromlocationinventory = Locationinventory.new({ location_id: purchaseorder.fromlocation_id, productvariant_id: productvariant_id, quantity: 0 - quantity })
new_fromlocationinventory.save
end
# Create or update the to locationinventory
unless tolocationinventory.nil?
tolocationinventory.quantity = tolocation_current_quantity + quantity
tolocationinventory.save
else
new_tolocationinventory = Locationinventory.new({ location_id: purchaseorder.tolocation_id, productvariant_id: productvariant_id, quantity: quantity })
new_tolocationinventory.save
end
end
#On update of purchaseorderadjustment
before_update :update_locationinventory
def update_locationinventory
# Get some info before updating the locationinventory
fromlocationinventory = Locationinventory.find(:first, conditions: { :location_id => purchaseorder.fromlocation_id, :productvariant_id => productvariant_id })
tolocationinventory = Locationinventory.find(:first, conditions: { :location_id => purchaseorder.tolocation_id, :productvariant_id => productvariant_id })
fromlocation_current_quantity = fromlocationinventory.quantity
tolocation_current_quantity = tolocationinventory.quantity
fromlocationinventory.quantity = fromlocation_current_quantity - quantity + self.quantity_was
fromlocationinventory.save
tolocationinventory.quantity = tolocation_current_quantity + quantity - self.quantity_was
tolocationinventory.save
end
#On destroy of purchaseorderadjustment
before_destroy :destroy_locationinventory
def destroy_locationinventory
# Get some info before updating the locationinventory
fromlocationinventory = Locationinventory.find(:first, conditions: { :location_id => purchaseorder.fromlocation_id, :productvariant_id => productvariant_id })
tolocationinventory = Locationinventory.find(:first, conditions: { :location_id => purchaseorder.tolocation_id, :productvariant_id => productvariant_id })
fromlocation_current_quantity = fromlocationinventory.quantity
tolocation_current_quantity = tolocationinventory.quantity
fromlocationinventory.quantity = fromlocation_current_quantity + quantity
fromlocationinventory.save
tolocationinventory.quantity = tolocation_current_quantity - quantity
tolocationinventory.save
end
end
productvariant.rb
class Productvariant < ActiveRecord::Base
attr_accessible :barcode, :compare_at_price, :fulfillment_service, :grams,
:inventory_management, :inventory_policy, :inventory_quantity,
:option1, :option2, :option3, :position, :price, :product_id,
:requires_shipping, :shopify_id, :sku, :taxable, :title, :shopify_product_id, :product_title
belongs_to :product, primary_key: "shopify_id", foreign_key: "shopify_product_id"
has_many :purchaseorderadjustments
has_many :locationinventories
def product_plus_variant
"#{self.product.title} - #{self.title}"
end
end
locationinventory.rb
class Locationinventory < ActiveRecord::Base
attr_accessible :location_id, :productvariant_id, :quantity
belongs_to :productvariant
belongs_to :location
end
答案 0 :(得分：1)
我会写这个答案，因为我觉得你提供了这么多代码，你可能会害怕一些回答者！
我们的经验如下：
<强>嵌套
您可以通过多种不同方式验证嵌套模型
您的问题与在accepts_nested_attributes_for中传递数据有关 - 您可以直接验证：
#app/models/purchase.rb
Class Purchase < ActiveRecord::Base
has_many :purchase_items
accepts_nested_attributes_for :purchase_items
end
#app/models/purchase_item.rb
Class PurchaseItem < ActiveRecord::Base
belongs_to :purchase
validates :name,
presence: { message: "Your Purchase Needs Items!" } #Returns to initial form with this error
end
标准
如果您想基于其他模型conditionally validate，则必须使用inverse_of:在整个数据交易中保持对象可用：
#app/models/purchase.rb
Class Purchase < ActiveRecord::Base
has_many :purchase_items, inverse_of: :purchase
accepts_nested_attributes_for :purchase_items
end
#app/models/purchase_item.rb
Class PurchaseItem < ActiveRecord::Base
belongs_to :purchase, inverse_of: :purchase_items
validates :name,
presence: { message: "Your Purchase Needs Items!" },
if: :paid_with_card?
private
def paid_with_card?
self.purchase.payment_method == "card"
end
end