Fixed default sort and added migration for shop_id => Integer

app/components/bikes.rb

@@ -33,6 +33,10 @@ class Bikes < Netzke::Basepack::Grid
                                            }
       }
     ]
+
+    # Default the sorting to ASC on shop_id
+    c.data_store.sorters = [{ property: 'shop_id', direction: 'ASC' }]
+
     @bike = Bike.all
     c.prohibit_update = true if cannot? :update, @bike
     c.prohibit_create = true if cannot? :create, @bike

app/models/bike.rb

@@ -12,9 +12,7 @@ class Bike < ActiveRecord::Base
   belongs_to :bike_condition
   belongs_to :bike_purpose
 
-  default_scope order('shop_id ASC')
-
-  validates :shop_id, :presence => true, :uniqueness => true, :length => { :minimum => 3 }
+  validates :shop_id, :presence => true, :uniqueness => true, :numericality => { :only_integer => true }
   validates :serial_number, :length => { :minimum => 3 }
   validates :model, :length => { :maximum => 50 }
   validates :bike_brand_id, :presence => true