allow_blank on serial_id

app/models/host.rb

@@ -7,7 +7,7 @@ class Host < ActiveRecord::Base
   validates :name,        presence: true, uniqueness: true, length: { maximum:  100 }, format: { with: /\A[^\/]+\Z/ }
   validates :ip_address,  format: { with: /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/ }, allow_blank: true
   validates :description, length: { maximum: 255 }
-  validates :serial_id,   uniqueness: true, length: { maximum:  128 }, format: { with: /\A[^\/]*\Z/ }
+  validates :serial_id,   allow_blank: true, uniqueness: true, length: { maximum:  128 }, format: { with: /\A[^\/]*\Z/ }
 
   has_many :host_relations, dependent: :delete_all
   has_many :services, through: :host_relations

db/migrate/20130305171636_remove_serial_id_index_on_host.rb

@@ -0,0 +1,5 @@
+class RemoveSerialIdIndexOnHost < ActiveRecord::Migration
+  def change
+    remove_index :hosts, :serial_id
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20121210144811) do
+ActiveRecord::Schema.define(version: 20130305171636) do
 
   create_table "activities", force: true do |t|
     t.integer  "user_id"
@@ -53,7 +53,6 @@
   end
 
   add_index "hosts", ["name"], name: "index_hosts_on_name", unique: true
-  add_index "hosts", ["serial_id"], name: "index_hosts_on_serial_id", unique: true
 
   create_table "roles", force: true do |t|
     t.string   "name"