Add code about stock & Add validation uniq of buyer in Cart

lib/shotengai/cart.rb

@@ -30,6 +30,7 @@ module Shotengai
     belongs_to :buyer, polymorphic: true, optional: true
 
     default_scope { where(status: 'cart') } 
+    validates_uniqueness_of :buyer_id, scope: [:buyer_type]
     
     #
     #  class Order < Shotengai::Order

lib/shotengai/controllers/customer/product_snapshots_controller.rb

@@ -2,47 +2,48 @@ module Shotengai
   module Controller
     module Customer
       class ProductSnapshotsController < Shotengai::Controller::Base
-        self.resources = ProductSnapshot
-        self.template_dir = 'shotengai/customer/snapshots/'
+        # self.resources = ProductSnapshot
+        # self.template_dir = 'shotengai/customer/snapshots/'
         
-        before_action :buyer_auth
-        before_action :edit_only_unpaid, except: [:index, :show, :create]
-        default_query do |resource, params|
-          # /orders/:order_id/snapshots
-          # /series/:series_id/snapshots
-          resource.where(
-              params[:order_id] && { shotengai_order_id: params[:order_id] }
-            ).where(
-              params[:series_id] && { shotengai_series_id: params[:series_id] }
-            )
-        end
+        # before_action :buyer_auth
+        # before_action :edit_only_unpaid, except: [:index, :show, :create]
+        # default_query do |resource, params|
+        #   # /orders/:order_id/snapshots
+        #   # /series/:series_id/snapshots
+        #   p 'come here'
+        #   resource.where(
+        #       params[:order_id] && { shotengai_order_id: params[:order_id] }
+        #     ).where(
+        #       params[:series_id] && { shotengai_series_id: params[:series_id] }
+        #     )
+        # end
 
-        index_query do |resource, params|
-          params[:in_cart] ? resource.in_cart : resource.in_order
-        end
+        # index_query do |resource, params|
+        #   params[:in_cart] ? resource.in_cart : resource.in_order
+        # end
 
-        # 不指定 order 时，默认创建在 cart 中
-        # TODO: WARNING: snapshots
-        def create
-          order_or_cart = Shotengai::Order.find_by_id(params[:order_id]) || @buyer.order_cart
-          @resource = order_or_cart.product_snapshots.create!(resource_params)
-          respond_with @resource, template: "#{@@template_dir}/show", status: 201
-        end
+        # # 不指定 order 时，默认创建在 cart 中
+        # # TODO: WARNING: snapshots
+        # def create
+        #   order_or_cart = Shotengai::Order.find_by_id(params[:order_id]) || @buyer.order_cart
+        #   @resource = order_or_cart.product_snapshots.create!(resource_params)
+        #   respond_with @resource, template: "#{@@template_dir}/show", status: 201
+        # end
 
-        private
-          def buyer_auth
-            @buyer = params[:buyer_type].constantize.find(params[:buyer_id])
-          end
+        # private
+        #   def buyer_auth
+        #     @buyer = params[:buyer_type].constantize.find(params[:buyer_id])
+        #   end
 
-          def resource_params
-            params.require(resource_key).permit(
-              :count, :shotengai_series_id
-            )
-          end
+        #   def resource_params
+        #     params.require(resource_key).permit(
+        #       :count, :shotengai_series_id
+        #     )
+        #   end
 
-          def edit_only_unpaid
-            raise Shotengai::WebError.new('订单已支付，不可修改。', '-1', 403) unless @resource.order.unpaid?
-          end
+        #   def edit_only_unpaid
+        #     raise Shotengai::WebError.new('订单已支付，不可修改。', '-1', 403) unless @resource.order.unpaid?
+        #   end
       end
     end
   end

lib/shotengai/order.rb

@@ -40,7 +40,7 @@ module Shotengai
       state :unpaid, initial: true
       state :paid, :delivering, :received, :canceled, :evaluated
       
-      event :pay, before: [:fill_snapshot, :set_pay_time] do
+      event :pay, before: [:fill_snapshot, :cut_stock, :set_pay_time] do
         transitions from: :unpaid, to: :paid 
       end
 
@@ -77,6 +77,12 @@ module Shotengai
       }
     end
 
+    def cut_stock
+      ActiveRecord::Base.transaction {
+        self.snapshots.each(&:cut_stock)
+      }
+    end
+
     def set_pay_time
       self.update!(pay_time: Time.now)
     end

lib/shotengai/series.rb

@@ -6,7 +6,7 @@ module Shotengai
   #  id                    :integer          not null, primary key
   #  original_price        :decimal(9, 2)
   #  price                 :decimal(9, 2)
-  #  stock                 :integer
+  #  stock                 :integer          default(-1)
   #  spec                  :json
   #  type                  :string(255)
   #  meta                  :json
@@ -32,10 +32,13 @@ module Shotengai
     
     # where(spec->'$.\"颜色\"' = ?  and spec->'$.\"大小\"' = ? ,红色,S)
     scope :query_spec_with_product, ->(val, product) { 
-      return none unless val.keys.sort == product.spec.keys.sort 
+      if val.keys.sort == product.spec.keys.sort 
         keys = []; values = []
         val.map { |k, v| keys << "spec->'$.\"#{k}\"' = ? "; values << v }
         where(keys.join(' and '), *values)
+      else
+        self.none 
+      end
     }
 
     class << self
@@ -56,8 +59,7 @@ module Shotengai
     end
 
     def cut_stock count
-      self.stock -= count
-      self.save!
+      self.stock.eql?(-1) || self.update!(stock: self.stock - count)
     end
 
     private 
@@ -71,7 +73,9 @@ module Shotengai
       end
 
       def uniq_spec
-        errors.add(:spec, 'Non uniq spec for the product.') if self.class.query_spec_with_product(self.spec, self.product).any?
+        if self.class.query_spec_with_product(self.spec, self.product).where.not(id: self.id).any?
+          errors.add(:spec, 'Non uniq spec for the product.') 
+        end
       end
 
       def validate_stock

lib/shotengai/snapshot.rb

@@ -72,6 +72,7 @@ module Shotengai
 
     # 订单支付后 存储当时信息快照
     def copy_info
+      # cut_stock
       self.update!(
         original_price: series.original_price,
         price: series.price,
@@ -83,6 +84,10 @@ module Shotengai
       )
     end
 
+    def cut_stock
+      self.series.cut_stock
+    end
+
     def meta
       read_attribute(:meta) || series.product.meta.merge(series.meta)
     end

spec/factories/shotengai_series.rb

@@ -5,7 +5,7 @@
 #  id                    :integer          not null, primary key
 #  original_price        :decimal(9, 2)
 #  price                 :decimal(9, 2)
-#  stock                 :integer
+#  stock                 :integer          default(-1)
 #  spec                  :json
 #  type                  :string(255)
 #  meta                  :json
@@ -18,7 +18,7 @@ FactoryGirl.define do
   factory :test_series, class: 'TestGoodSeries' do
     original_price 100
     price 80
-    stock 10
+    # stock 10
     spec {
       {
         "颜色" => "红色",
@@ -41,7 +41,7 @@ FactoryGirl.define do
     spec {
       {
         "颜色" => "红色",
-        "大小" => "S",
+        "大小" => "L",
       }
     }
     # type 

spec/shotengai/models_spec.rb

@@ -67,20 +67,36 @@ RSpec.describe 'Shotengai Models' do
       it 'validate' do
         expect(@series.spec.class).to eq(Hash)
         # 非法关键字
-        expect{
+        expect {
           @series.update!(spec: {"颜色" => "红色", "大小" => 1111 })
         }.to raise_error(ActiveRecord::RecordInvalid)
         # 关键字缺失
+        # require 'irb'
+        # binding.irb
         expect{ 
           @series.update!(spec: {"颜色" => "红色"})
         }.to raise_error(ActiveRecord::RecordInvalid)
         # uniq validate about spec
+        expect {
           TestGoodSeries.create!(
-          FactoryGirl.attribute_for(:test_series).merge(
+            FactoryGirl.attributes_for(:test_series).merge(
               {test_good: @good}
             )
           )
+        }.to raise_error(ActiveRecord::RecordInvalid)
+      end
 
+      it 'About Stock' do
+        # 默认为 -1 （无限库存）
+        @series.cut_stock(1000)
+        expect(@series.reload.stock).to eq(-1)
+        # 非无限库存
+        @series.update!(stock: 10)
+        @series.cut_stock(10)
+        expect(@series.reload.stock).to eq(0)
+        expect { 
+          @series.cut_stock(20)
+        }.to raise_error(ActiveRecord::RecordInvalid)
       end
 
       it 'Associations' do