Ensure source file autoload call only triggered on create

app/models/dunlop/source_file_model.rb

@@ -34,7 +34,7 @@ module Dunlop::SourceFileModel
       event(:failed)    { transition  any                 => :failed    }
     end
 
-    after_commit { autoload! }
+    after_commit(on: :create) { autoload! }
 
     self::Job = Class.new "#{name.deconstantize}::ApplicationJob".constantize do
       def perform(source_file_id)

spec/dummy/app/jobs/application_job.rb

@@ -0,0 +1,3 @@
+class ApplicationJob < ActiveJob::Base
+
+end

spec/models/dunlop/source_file_model_spec.rb

@@ -4,6 +4,14 @@ describe SourceFile::MySource do
   subject { create('source_file/my_source', original_file: fixture_file("source_files/my_source_1.csv") ) }
   let(:model) { SourceRecord::MySource }
 
+  describe '#autoload!' do
+    it 'calls on create, not on update' do
+      expect_any_instance_of(described_class).to receive(:autoload!).once
+      subject # create
+      subject.update(state: 'loading')
+      subject.update(state: 'pending')
+    end
+  end
   describe "#first_line" do
     it "returns the first line" do
       subject.first_line(subject.original_file.path).should eq "my_date,my_var,My count,my_num,my_truth"