Add methods about buy product with order to Buyer & Improve README about it

README.md

@@ -74,15 +74,34 @@ This will copy shotengai example views to your application under 'app/views/shot
 
 ## Methods
 
-### Order
-Add snapshots into order:
-``` ruby
+### Buy Product with Order
+Use methods in buyer model with series_id:
+    Add into cart:
+    ``` ruby
+        # snapshot_params = params.require(:snapshot).permit(
+        #   :shotengai_series_id, :count, # .. and so on
+        # )
+        @user.add_to_order_cart(snapshot_params)
+    ```
+    Create order by series_id immediately:
+    ```
+        @user.buy_it_immediately(snapshot_params, order_params)
+    ```
+    You can also use methods in order model here by adding params like 
+    ``` ruby
+    { incr_snapshot_ids: [1, 2, 3] } 
+    ```
+
+Or use methods in order model with snapshot_id
+    Add snapshots into order:
+    ``` ruby
     Order.create.incr_snapshot_ids= [ some_snapshot_ids ]
-```
-Add snapshot into cart (a new snapshot or a snapshot in order):
-``` ruby
+    ```
+    Add snapshots into cart (a new snapshot or snapshots in order unpaid):
+    ``` ruby
     Order.create.gone_snapshot_ids= [ some_snapshot_ids ]
-```
+    ```
+
 
 ## Development
 

lib/shotengai/buyer.rb

@@ -19,12 +19,30 @@ module Shotengai
         has_one cart_name.to_sym, class_name: klass.cart_class.name, as: :buyer
         # User.new Cart 相关
         class_eval("
+          after_create :create_#{cart_name}
+          
           def #{cart_name}
             super || create_#{cart_name}
           end
           
-          def add_to_#{cart_name} snapshot
-            snapshot.update!(test_order_cart: self.#{cart_name})
+          def add_to_#{cart_name} snapshot_params
+            Shotengai::Series.find(snapshot_params[:shotengai_series_id]).snapshots.create!(
+                snapshot_params.merge({
+                  shotengai_order_id: self.#{cart_name}.id,
+                })
+              )
+          end
+
+          def buy_it_immediately snapshot_params, order_params
+            ActiveRecord::Base.transaction do
+              order = self.#{collection_name}.create!(order_params)
+              Shotengai::Series.find(snapshot_params[:shotengai_series_id]).snapshots.create!(
+                  snapshot_params.merge({ 
+                    shotengai_order: order 
+                  })
+                )
+              order
+            end
           end
         ")
       end

lib/shotengai/controllers/customer/orders_controller.rb

@@ -25,18 +25,12 @@ module Shotengai
         end
 
         def add_to_cart
-          snapshot = @buyer.order_cart.product_snapshots.create!(snapshot_params)
+          snapshot = @buyer.add_to_order_cart(snapshot_params) 
           respond_with @resource = snapshot, template: 'shotengai/customer/snapshots/show', status: 201
         end
 
         def create_directly # using :series_id & :count
-          ActiveRecord::Base.transaction do
-            @resource = @buyer.orders.create!(resource_params)
-            Shotengai::Series.find(snapshot_params[:shotengai_series_id]).snapshots.create!(
-                count: snapshot_params[:count],
-                shotengai_order: @resource
-              )
-          end
+          @resource = @buyer.buy_it_immediately(snapshot_params, resource_params)
           respond_with @resource, template: "#{@@template_dir}/show", status: 201
         end
 

lib/shotengai/order.rb

@@ -102,7 +102,8 @@ module Shotengai
       ActiveRecord::Base.transaction do
         ids.each { |id| 
           # using update(shotengai_order_id: id) can not get self.id before save
-          Shotengai::Snapshot.find(id).update!(shotengai_order: self)
+          Shotengai::Snapshot.find(id).update!(shotengai_order_id: self.id)
+          
         }
       end
     end