Integrate versioning into AR touch method

lib/paper_trail/model_config.rb

@@ -116,6 +116,14 @@ def on_update
       @model_class.paper_trail_options[:on] << :update
     end
 
+    # Adds a callback that records a version after a "touch" event.
+    # @api public
+    def on_touch
+      @model_class.after_touch { |r|
+        r.paper_trail.record_update(force: true, in_after_callback: true)
+      }
+    end
+
     # Set up `@model_class` for PaperTrail. Installs callbacks, associations,
     # "class attributes", instance methods, and more.
     # @api private
@@ -196,6 +204,8 @@ def setup_callbacks_from_options(options_on = [])
       options_on.each do |event|
         public_send("on_#{event}")
       end
+
+      public_send("on_touch")
     end
 
     def setup_habtm_change_callbacks(assoc)

spec/models/widget_spec.rb

@@ -250,6 +250,14 @@
     end
   end
 
+  describe "touch", versioning: true do
+    it "creates a version" do
+      expect { widget.touch }.to change {
+        widget.versions.count
+      }.by(+1)
+    end
+  end
+
   describe ".paper_trail.update_columns", versioning: true do
     it "creates a version record" do
       widget = Widget.create

spec/paper_trail/model_spec.rb

@@ -56,15 +56,15 @@
     context "and then updated without any changes" do
       before { @widget.touch }
 
-      it "not have a new version" do
-        expect(@widget.versions.length).to(eq(1))
+      it "to have two previous versions" do
+        expect(@widget.versions.length).to(eq(2))
       end
     end
 
     context "and then updated with changes" do
       before { @widget.update_attributes(name: "Harry") }
 
-      it "have two previous versions" do
+      it "have three previous versions" do
         expect(@widget.versions.length).to(eq(2))
       end