* Refactored post history. Each post now has a single history record. This history record has multiple revisions, serialized as JSON in a text field.

test/unit/post_history_test.rb

@@ -7,6 +7,7 @@ class PostHistoryTest < ActiveSupport::TestCase
       CurrentUser.user = @user
       CurrentUser.ip_addr = "127.0.0.1"
       MEMCACHE.flush_all
+      PostHistory.stubs(:revision_time).returns("TIME")
     end
     
     teardown do
@@ -15,19 +16,48 @@ class PostHistoryTest < ActiveSupport::TestCase
     end
 
     should "create a revision after creation" do
-      PostHistory.stubs(:revision_time).returns("TIME")
       post = Factory.create(:post, :tag_string => "aaa bbb ccc")
       assert_equal(1, post.revisions.size)
-      assert_equal({"source"=>nil, "rating"=>"q", "tag_string"=>"aaa bbb ccc", "parent_id"=>nil, "user_id"=>1, "ip_addr"=>"127.0.0.1", "updated_at"=>"TIME"}, post.revisions.last)
+      assert_equal({"source"=>nil, "rating"=>"q", "tag_string"=>"aaa bbb ccc", "parent_id"=>nil, "user_id"=>@user.id, "ip_addr"=>"127.0.0.1", "updated_at"=>"TIME"}, post.revisions.last)
     end
 
     should "create additional revisions after updating" do
-      PostHistory.stubs(:revision_time).returns("TIME")
       post = Factory.create(:post, :tag_string => "aaa bbb ccc")
       post.update_attributes(:tag_string => "bbb ccc ddd")
       post.reload
       assert_equal(2, post.revisions.size)
-      assert_equal({"source"=>nil, "rating"=>"q", "tag_string"=>"bbb ccc ddd", "parent_id"=>nil, "user_id"=>3, "ip_addr"=>"127.0.0.1", "updated_at"=>"TIME"}, post.revisions.last)
+      assert_equal({"source"=>nil, "rating"=>"q", "tag_string"=>"bbb ccc ddd", "parent_id"=>nil, "user_id"=>@user.id, "ip_addr"=>"127.0.0.1", "updated_at"=>"TIME"}, post.revisions.last)
+    end
+    
+    context "history" do
+      setup do
+        @post = Factory.create(:post, :tag_string => "aaa bbb ccc", :source => "xyz", :rating => "q")
+        @post.update_attributes(:tag_string => "bbb ccc ddd", :source => "abc", :rating => "s")
+        @post.update_attributes(:tag_string => "ccc ddd eee")
+        @revisions = []
+        @post.history.each_revision do |revision|
+          @revisions << revision
+        end
+      end
+      
+      should "link revisions together" do
+        assert_nil(@revisions[0].prev)
+        assert_equal(@revisions[0], @revisions[1].prev)
+        assert_equal(@revisions[1], @revisions[2].prev)
+      end
+      
+      should "iterate over its revisions" do
+        assert_equal(3, @revisions.size)
+        assert_equal(%w(aaa bbb ccc), @revisions[0].tag_array)
+        assert_equal(%w(bbb ccc ddd), @revisions[1].tag_array)
+        assert_equal(%w(ccc ddd eee), @revisions[2].tag_array)
+      end
+      
+      should "create a diff for each revision detailing what changed" do
+        assert_equal({:add=>["aaa", "bbb", "ccc"], :del=>[], :rating=>"q", :source=>"xyz", :parent_id=>nil}, @revisions[0].diff)
+        assert_equal({:del=>["aaa"], :add=>["ddd"], :rating=>"s", :source=>"abc"}, @revisions[1].diff)
+        assert_equal({:del=>["bbb"], :add=>["eee"]}, @revisions[2].diff)
+      end
     end
   end
 end