BUGFIX/FEATURE: store topic changes in post revisions

History + edit notifications for title and category changes

spec/models/post_revision_spec.rb

@@ -3,7 +3,63 @@ require_dependency 'post_revision'
 
 describe PostRevision do
 
-  it { should belong_to :user }
-  it { should belong_to :post }
+  before do
+    @number = 1
+  end
+
+  def create_rev(modifications, post_id=1)
+    @number += 1
+    PostRevision.create!(post_id: post_id, user_id: 1, number: @number, modifications: modifications)
+  end
+
+  it "can grab history from current object" do
+    p = PostRevision.new(modifications: {"foo" => ["bar", "bar1"]})
+    p.previous("foo").should == "bar"
+    p.current("foo").should == "bar1"
+  end
+
+  it "can fallback to previous revisions if needed" do
+    create_rev("foo" => ["A", "B"])
+    r2 = create_rev("bar" => ["C", "D"])
+
+    r2.current("foo").should == "B"
+    r2.previous("foo").should == "B"
+  end
+
+  it "can fallback to post if needed" do
+    post = Fabricate(:post)
+    r = create_rev({"foo" => ["A", "B"]}, post.id)
+
+    r.current("raw").should == post.raw
+    r.previous("raw").should == post.raw
+    r.current("cooked").should == post.cooked
+    r.previous("cooked").should == post.cooked
+  end
+
+  it "can fallback to topic if needed" do
+    post = Fabricate(:post)
+    r = create_rev({"foo" => ["A", "B"]}, post.id)
+
+    r.current("title").should == post.topic.title
+    r.previous("title").should == post.topic.title
+  end
+
+  it "can find title changes" do
+    r = create_rev({"title" => ["hello", "frog"]})
+    r.title_changes[:inline].should =~ /frog.*hello/
+    r.title_changes[:side_by_side].should =~ /hello.*frog/
+  end
+
+  it "can find category changes" do
+    cat1 = Fabricate(:category, name: "cat1")
+    cat2 = Fabricate(:category, name: "cat2")
+
+    r = create_rev({"category_id" => [cat1.id, cat2.id]})
+
+    changes = r.category_changes
+    changes[:previous_category_id].should == cat1.id
+    changes[:current_category_id].should == cat2.id
+
+  end
 
 end