fixes #1863

app/models/post.rb

@@ -915,16 +915,39 @@ class Post < ActiveRecord::Base
   module VersionMethods
     def create_version(force = false)
       if new_record? || rating_changed? || source_changed? || parent_id_changed? || tag_string_changed? || force
-        CurrentUser.increment!(:post_update_count)
-        versions.create(
-          :rating => rating,
-          :source => source,
-          :tags => tag_string,
-          :parent_id => parent_id
-        )
+        if merge_version?
+          merge_version
+        else
+          create_new_version
+        end
       end
     end
 
+    def merge_version?
+      prev = versions.last
+      prev && prev.updater_id == CurrentUser.user.id && prev.updated_at > 1.hour.ago
+    end
+
+    def create_new_version
+      CurrentUser.increment!(:post_update_count)
+      versions.create(
+        :rating => rating,
+        :source => source,
+        :tags => tag_string,
+        :parent_id => parent_id
+      )
+    end
+
+    def merge_version
+      prev = versions.last
+      prev.update_attributes(
+        :rating => rating,
+        :source => source,
+        :tags => tag_string,
+        :parent_id => parent_id
+      )
+    end
+
     def revert_to(target)
       self.tag_string = target.tags
       self.rating = target.rating

test/unit/post_test.rb

@@ -566,8 +566,32 @@ class PostTest < ActiveSupport::TestCase
       end
 
       context "that has been updated" do
+        should "create a new version if it's the first version" do
+          assert_difference("PostVersion.count", 1) do
+            post = FactoryGirl.create(:post)
+          end
+        end
+
+        should "create a new version if it's been over an hour since the last update" do
+          post = FactoryGirl.create(:post)
+          Timecop.travel(6.hours.from_now) do
+            assert_difference("PostVersion.count", 1) do
+              post.update_attributes(:tag_string => "zzz")
+            end
+          end
+        end
+
+        should "merge with the previous version if the updater is the same user and it's been less than an hour" do
+          post = FactoryGirl.create(:post)
+          assert_difference("PostVersion.count", 0) do
+            post.update_attributes(:tag_string => "zzz")
+          end
+          assert_equal("zzz", post.versions.last.tags)
+        end
+
         should "increment the updater's post_update_count" do
           post = FactoryGirl.create(:post, :tag_string => "aaa bbb ccc")
+          post.stubs(:merge_version?).returns(false)
 
           assert_difference("CurrentUser.post_update_count", 1) do
             post.update_attributes(:tag_string => "zzz")
@@ -1200,6 +1224,7 @@ class PostTest < ActiveSupport::TestCase
     context "a post that has been updated" do
       setup do
         @post = FactoryGirl.create(:post, :rating => "q", :tag_string => "aaa")
+        @post.stubs(:merge_version?).returns(false)
         @post.update_attributes(:tag_string => "aaa bbb ccc ddd")
         @post.update_attributes(:tag_string => "bbb xxx yyy", :source => "xyz")
         @post.update_attributes(:tag_string => "bbb mmm yyy", :source => "abc")

test/unit/post_version_test.rb

@@ -17,6 +17,7 @@ class PostVersionTest < ActiveSupport::TestCase
     context "that has multiple versions: " do
       setup do
         @post = FactoryGirl.create(:post, :tag_string => "1")
+        @post.stubs(:merge_version?).returns(false)
         @post.update_attributes(:tag_string => "1 2")
         @post.update_attributes(:tag_string => "2 3")
       end
@@ -59,6 +60,7 @@ class PostVersionTest < ActiveSupport::TestCase
       setup do
         @parent = FactoryGirl.create(:post)
         @post = FactoryGirl.create(:post, :tag_string => "aaa bbb ccc", :rating => "q", :source => "xyz")
+        @post.stubs(:merge_version?).returns(false)
         @post.update_attributes(:tag_string => "bbb ccc xxx", :source => "")
       end
 

test/unit/tag_alias_test.rb

@@ -62,14 +62,20 @@ class TagAliasTest < ActiveSupport::TestCase
       end
     end
 
-    should "not push the antecedent's category to the consequent if the antecedent is general"
-
-    should "push the antecedent's category to the consequent" do
+    should "not push the antecedent's category to the consequent if the antecedent is general" do
       tag1 = FactoryGirl.create(:tag, :name => "aaa")
       tag2 = FactoryGirl.create(:tag, :name => "bbb", :category => 1)
       ta = FactoryGirl.create(:tag_alias, :antecedent_name => "aaa", :consequent_name => "bbb")
       tag2.reload
       assert_equal(1, tag2.category)
     end
+
+    should "push the antecedent's category to the consequent" do
+      tag1 = FactoryGirl.create(:tag, :name => "aaa", :category => 1)
+      tag2 = FactoryGirl.create(:tag, :name => "bbb")
+      ta = FactoryGirl.create(:tag_alias, :antecedent_name => "aaa", :consequent_name => "bbb")
+      tag2.reload
+      assert_equal(1, tag2.category)
+    end
   end
 end