Nested attributes on Transactions isn't working so well

app/components/transactions.rb

@@ -13,5 +13,55 @@ class Transactions < Netzke::Basepack::Grid
                                            }
       }
     ]
+    
+  end
+
+  def default_fields_for_forms
+    bike_store = Bike.all.map { |b| [b.id, b.serial_number] }
+    user_store = User.all.map { |u| [u.id, u.to_s] }
+    [
+      :amount,
+      :item,
+      { :name => :for_bike, :checkboxName => :bike_item, :inputValue => true, :title => "Selling a bike?",
+        :xtype => 'fieldset', :checkboxToggle => true, :collapsed => true, :items => [
+          {:xtype => 'combo', :no_binding => true, :name => :bike_id, :title => 'Bike', :fieldLabel => 'Bike', :store => bike_store}
+        ]
+      },
+      {
+        xtype: 'fieldcontainer',
+        fieldLabel: 'Customer Type',
+        defaultType: 'radiofield',
+        defaults: {
+          flex: 1
+        },
+        layout: 'hbox',
+        items: [
+          {
+            no_binding: true,
+            boxLabel: 'Customer',
+            name: 'customer_type',
+            inputValue: 'Customer',
+            id: 'customer_radio'
+          },
+          {
+            no_binding: true,
+            boxLabel: 'User',
+            name: 'customer_type',
+            inputValue: 'User',
+            id: 'user_radio'
+          }
+        ]
+      },
+      { :name => :for_user, :checkboxName => :customer_type, :inputValue => true, :title => "Customer a User?",
+        :xtype => 'fieldset', :collapsible => true, :collapsed => true, :items => [
+          {:xtype => 'combo', :no_binding => true, :name => :customer_id, :title => 'User', :fieldLabel => 'User', :store => user_store}
+        ]
+      },
+      { :name => :for_customer, :checkboxName => :customer_type, :inputValue => true, :title => "New Customer?",
+        :xtype => 'fieldset', :collapsible => true, :collapsed => true, :items => [
+          { :xtype => 'textfield', :no_binding => true, :name => 'customer[first_name]'},
+        ]
+      }
+    ]
   end
 end

app/models/transaction.rb

@@ -1,8 +1,24 @@
 class Transaction < ActiveRecord::Base
   acts_as_loggable
-  attr_accessible :vendor_id, :customer_id, :customer_type, :bike_id, :amount, :item
+
+  attr_accessible :vendor_id, :customer_id, :customer_type, :bike_id, :amount, :item,
+    :customer_attributes
 
   belongs_to :vendor, :class_name => 'User', :foreign_key => 'vendor_id'
   belongs_to :bike
+  belongs_to :customer
+
+  accepts_nested_attributes_for :customer, allow_destroy: false
+
+  before_save :check_customer_type
 
+  def check_customer_type
+    puts "_________------------_________------------_________------------"
+    puts self.inspect
+    puts "_________------------_________------------_________------------"
+  end
+
+  def to_s
+    "#{amount} #{item} #{bike_id}"
+  end
 end