修改contest表中budget字段的属性，将integer改为string

app/models/contest.rb

@@ -24,7 +24,7 @@ class Contest < ActiveRecord::Base
   validates_length_of :description, :maximum => DESCRIPTION_LENGTH_LIMIT
   validates_presence_of :author_id, :name, :deadline
   validates_format_of :deadline, :with => /^[\d]{4}[-][\d]{1,2}[-][\d]{1,2}$/
-  validates_format_of :budget, :with => /^(\d+)$|^(\d+).([0-9]{2})|^(\d+).([0-9]{1})$/
+  # validates_format_of :budget, :with => /^(\d+)$|^(\d+).([0-9]{2})|^(\d+).([0-9]{1})$/
   validate :validate_user
   after_create :act_as_activity
 

db/migrate/20140327082704_change_created_at_of_contests_to_created_on.rb

@@ -1,10 +1,10 @@
 class ChangeCreatedAtOfContestsToCreatedOn < ActiveRecord::Migration
-  def self.up
+  def up
     rename_column :contests, :created_at, :created_on
     rename_column :contests, :updated_at, :updated_on
   end
 
-  def self.down
+  def down
     rename_column :contests, :created_on, :created_at
     rename_column :contests, :updated_on, :updated_at 
   end

db/migrate/20140424022002_remove_budget_from_contests.rb

@@ -0,0 +1,10 @@
+class RemoveBudgetFromContests < ActiveRecord::Migration
+  def self.up
+    change_column :contests, :budget, :string, :default => ""
+  end
+
+  def self.down
+    change_column :contests, :budget, :integer, :default => 0
+  end
+
+end