acts_as_taggable_on_steroids.diff

diff --git vendor/plugins/acts_as_taggable_on_steroids/lib/acts_as_taggable.rb vendor/plugins/acts_as_taggable_on_steroids/lib/acts_as_taggable.rb
index 7a96ef0..adaaeba 100644
--- vendor/plugins/acts_as_taggable_on_steroids/lib/acts_as_taggable.rb
+++ vendor/plugins/acts_as_taggable_on_steroids/lib/acts_as_taggable.rb
@@ -9,7 +9,8 @@ module ActiveRecord #:nodoc:
         def acts_as_taggable
           has_many :taggings, :as => :taggable, :dependent => :destroy, :include => :tag
           has_many :tags, :through => :taggings
-          
+
+          validate :validate_tags
           before_save :save_cached_tag_list
           
           after_create :save_tags
@@ -181,6 +182,21 @@ module ActiveRecord #:nodoc:
         def tag_list=(value)
           @tag_list = TagList.from(value)
         end
+
+        def validate_tags
+          error_messages = []
+          new_tag_names = @tag_list - tags.map(&:name)
+
+          new_tag_names.each do |new_tag_name|
+            tag = Tag.find_or_initialize_with_like_by_name(new_tag_name)
+            error_messages << tag.errors.on(:name) unless tag.valid?
+          end
+          error_messages.flatten!
+
+          error_messages.uniq.each do |msg|
+            errors.add :tag_list, msg
+          end
+        end
         
         def save_cached_tag_list
           if self.class.caching_tag_list?
diff --git vendor/plugins/acts_as_taggable_on_steroids/lib/tag.rb vendor/plugins/acts_as_taggable_on_steroids/lib/tag.rb
index 4ac6a24..115f8a3 100644
--- vendor/plugins/acts_as_taggable_on_steroids/lib/tag.rb
+++ vendor/plugins/acts_as_taggable_on_steroids/lib/tag.rb
@@ -16,6 +16,10 @@ class Tag < ActiveRecord::Base
   def self.find_or_create_with_like_by_name(name)
     find(:first, :conditions => ["name LIKE ?", name]) || create(:name => name)
   end
+
+  def self.find_or_initialize_with_like_by_name(name)
+    find(:first, :conditions => ["name LIKE ?", name]) || new(:name => name)
+  end
   
   def ==(object)
     super || (object.is_a?(Tag) && name == object.name)

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