refactored post search

test/unit/post_test.rb

@@ -830,6 +830,20 @@ class PostTest < ActiveSupport::TestCase
       relation = Post.tag_match("order:landscape")
       assert_equal(post3.id, relation.first.id)      
     end
+    
+    should "fail for exclusive tag searches with no other tag" do
+      post1 = Factory.create(:post, :rating => "s", :tag_string => "aaa")
+      assert_raise(::Post::SearchError) do
+        relation = Post.tag_match("-aaa")
+      end
+    end
+    
+    should "succeed for exclusive tag searches combined with a metatag" do
+      post1 = Factory.create(:post, :rating => "s", :tag_string => "aaa")
+      assert_nothing_raised do
+        relation = Post.tag_match("-aaa id:>0")
+      end
+    end
   end
 
   context "Voting:" do

test/unit/tag_alias_test.rb

@@ -31,6 +31,8 @@ class TagAliasTest < ActiveSupport::TestCase
       tag1 = Factory.create(:tag, :name => "aaa")
       tag2 = Factory.create(:tag, :name => "bbb")
       ta = FactoryGirl.create(:tag_alias, :antecedent_name => "aaa", :consequent_name => "bbb")
+      assert_nil(MEMCACHE.get("ta:aaa"))
+      ta.update_cache
       assert_equal("bbb", MEMCACHE.get("ta:aaa"))
       ta.destroy
       assert_nil(MEMCACHE.get("ta:aaa"))