fixes #889

app/models/tag_subscription.rb

@@ -6,7 +6,7 @@ class TagSubscription < ActiveRecord::Base
   before_save :limit_tag_count
   attr_accessible :name, :tag_query, :post_ids, :is_public, :is_visible_on_profile
   validates_presence_of :name, :tag_query, :creator_id
-  validates_format_of :tag_query, :with => /\A(?:[^\r\n]*(?:\r?\n)*){1,20}\Z/, :message => "can have up to 20 queries"
+  validate :validate_number_of_queries
   validate :creator_can_create_subscriptions, :on => :create
 
   def normalize_name
@@ -38,6 +38,15 @@ class TagSubscription < ActiveRecord::Base
     end
   end
 
+  def validate_number_of_queries
+    if tag_query_array.size > 20 || tag_query_array.size < 1
+      self.errors.add(:tag_query, "can have up to 20 queries")
+      return false
+    else
+      return true
+    end
+  end
+
   def tag_query_array
     tag_query.scan(/[^\r\n]+/).map(&:strip)
   end