corrected the relation condition on context_taggings and added tests.…

… tests fail given previous coditions.

lib/acts_as_taggable_on/acts_as_taggable_on/core.rb

@@ -21,7 +21,7 @@ def initialize_acts_as_taggable_on_core
 
           class_eval do
             has_many context_taggings, :as => :taggable, :dependent => :destroy, :include => :tag, :class_name => "ActsAsTaggableOn::Tagging",
-                     :conditions => ["#{ActsAsTaggableOn::Tagging.table_name}.tagger_id IS NULL AND #{ActsAsTaggableOn::Tagging.table_name}.context = ?", tags_type]
+            :conditions => ["#{ActsAsTaggableOn::Tagging.table_name}.tag_id = #{ActsAsTaggableOn::Tag.table_name}.id AND #{ActsAsTaggableOn::Tagging.table_name}.context = ?", tags_type]
             has_many context_tags, :through => context_taggings, :source => :tag, :class_name => "ActsAsTaggableOn::Tag"
           end
 
@@ -249,4 +249,4 @@ def save_tags
       end
     end
   end
-end
+end

spec/acts_as_taggable_on/taggable_spec.rb

@@ -4,6 +4,7 @@
   before(:each) do
     clean_database!
     @taggable = TaggableModel.new(:name => "Bob Jones")
+    @taggables = [@taggable, TaggableModel.new(:name => "John Doe")]
   end
 
   it "should have tag types" do
@@ -68,6 +69,22 @@
     @taggable.should have(2).skills
   end
 
+  it "should be able to select taggables by subset of tags using ActiveRelation methods" do
+    @taggables[0].tag_list = "bob"
+    @taggables[1].tag_list = "charlie"
+    @taggables[0].skill_list = "ruby"
+    @taggables[1].skill_list = "css"
+    @taggables.each{|taggable| taggable.save}
+
+    @found_taggables_by_tag = TaggableModel.joins(:tags).where(:tags => {:name => ["bob"]})
+    @found_taggables_by_skill = TaggableModel.joins(:skills).where(:tags => {:name => ["ruby"]})
+
+    @found_taggables_by_tag.should include @taggables[0]
+    @found_taggables_by_tag.should_not include @taggables[1]
+    @found_taggables_by_skill.should include @taggables[0]
+    @found_taggables_by_skill.should_not include @taggables[1]
+  end
+
   it "should be able to find by tag" do
     @taggable.skill_list = "ruby, rails, css"
     @taggable.save