Fix dup mounter cache behavior

lib/carrierwave/orm/activerecord.rb

@@ -43,8 +43,8 @@ def reload(*)
         # Reset cached mounter on record dup
         def initialize_dup(other)
           old_uploaders = _mounter(:"#{column}").uploaders
-          @_mounters[:"#{column}"] = nil
           super
+          @_mounters[:"#{column}"] = nil
           # The attribute needs to be cleared to prevent it from picked up as identifier
           write_attribute(_mounter(:#{column}).serialization_column, nil)
           _mounter(:"#{column}").cache(old_uploaders)

spec/orm/activerecord_spec.rb

@@ -1919,6 +1919,10 @@ def reload(*)
       Event.mount_uploader(:image, @uploader)
     end
 
+    after do
+      FileUtils.rm_rf(public_path("uploads"))
+    end
+
     it "caches the existing file into the new model" do
       @event.image = stub_file('test.jpeg')
       @event.save
@@ -1956,6 +1960,15 @@ def reload(*)
       expect { @event.dup }.not_to change { @event[:image] }
     end
 
+    it "can upload a file" do
+      @event.image = stub_file('test.jpeg')
+      @event.dup
+
+      expect(@event.save).to be_truthy
+      expect(@event.image.path).to eq public_path('uploads/test.jpeg')
+      expect(File.exist?(@event.image.path)).to be_truthy
+    end
+
     context "with more than one mount" do
       before do
         @uploader1 = Class.new(CarrierWave::Uploader::Base)
@@ -2013,6 +2026,20 @@ def store_dir
         expect(@event.save).to be_truthy
         expect(@event.image.current_path).to eq public_path("uploads/event/image/#{@event.id}/test.jpeg")
       end
+
+      it "upload files to appropriate paths" do
+        @event.image = stub_file('test.jpeg')
+        new_event = @event.dup
+        expect(new_event).not_to be @event
+
+        expect(@event.save).to be_truthy
+        expect(@event.image.path).to eq public_path("uploads/event/image/#{@event.id}/test.jpeg")
+        expect(File.exist?(@event.image.path)).to be_truthy
+
+        expect(new_event.save).to be_truthy
+        expect(new_event.image.path).to eq public_path("uploads/event/image/#{new_event.id}/test.jpeg")
+        expect(File.exist?(new_event.image.path)).to be_truthy
+      end
     end
 
     context 'when #initialize_dup is overridden in the model' do