Fix basic style issues with rubocop

app/models/venue.rb

@@ -11,13 +11,17 @@ class Venue < ActiveRecord::Base
                                     content_type: [/jpg/, /jpeg/, /png/, /gif/],
                                     size: { in: 0..500.kilobytes }
   accepts_nested_attributes_for :lodgings, allow_destroy: true
+
   private
 
+  # TODO: create a module to be mixed into model to perform same operation
+  # event.rb has same functionality which can be shared
+  # TODO: rename guid to UUID as guid is specifically Microsoft term
   def generate_guid
-    begin
-      guid = SecureRandom.urlsafe_base64
-    end while Venue.where(:guid => guid).exists?
-    self.guid = guid
+    loop do
+      @guid = SecureRandom.urlsafe_base64
+      break if !Venue.where(:guid => guid).any?
+    end
+    self.guid = @guid
   end
-
 end