ensured that new users can sign up with other new users invite codes

app/models/user.rb

@@ -28,12 +28,7 @@ class User < ActiveRecord::Base
   validates_uniqueness_of :name # done by devise
   validates_uniqueness_of :email # done by devise
 
-  if ActiveRecord::Base.connection.table_exists? 'users' 
-    codes =  ActiveRecord::Base.connection.execute("SELECT code FROM users").map {|user| user["code"] }
-  else 
-    codes = []
-  end
-  validates :joinedwithcode, :presence => true, :inclusion => { :in => codes, :message => "%{value} is not valid" }, :on => :create
+  validates :joinedwithcode, :presence => true, :inclusion => { :in => $codes, :message => "%{value} is not valid" }, :on => :create
     
   # This method associates the attribute ":image" with a file attachment
   has_attached_file :image, :styles => {
@@ -55,6 +50,8 @@ class User < ActiveRecord::Base
     #generate a random 8 letter/digit code that they can use to invite people
 	  self.code = rand(36**8).to_s(36)
 
+    $codes.push(self.code)
+
     self.generation = self.get_generation
   end
 

config/initializers/access_codes.rb

@@ -0,0 +1,4 @@
+ $codes = []
+ if ActiveRecord::Base.connection.table_exists? 'users' 
+ 	$codes =  ActiveRecord::Base.connection.execute("SELECT code FROM users").map {|user| user["code"] }
+ end