report.rb

class Report
  # ENGINEERING MACHINATIONS
  machine(:status, :field_name => "status") do

    # we are waiting for someone to upload a file
    state :file_pending do
      event :upload_file, :to => :file_uploaded
    end

    # we've got a file, but it's not approved by a hu-man
    state :file_uploaded do
      # requires :uploaded_file
      event :approve_file, :to => :file_approved
      event :reject_file, :to => :file_rejected
    end
    
    # the file is shit and needs to be re-uploaded
    state :file_rejected do
      # on_entry :deliver_rejection_notification
      # requires :rejection_reason
      event :upload_file, :to => :file_uploaded
    end
    
    # we like the file. let's start the extraction.
    state :file_approved do
      # on_entry :deliver_approval_notification
      event :process, :to => :being_processed
    end
end

report_spec.rb

it "should follow our stateful path quite nicely" do

  @report = Report.make

  @report.status.name.should eql(:file_pending)

  @report.upload_file!
  @report.status.name.should eql(:file_uploaded)

  @report.reject_file!
  @report.status.name.should eql(:file_rejected)

  @report.upload_file!
  @report.status.name.should eql(:file_uploaded)

  @report.approve_file!
  @report.status.name.should eql(:file_approved)

end