You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: commit_controller.rb
    path of file: ./repos/gitlabhq/app/controllers/projects
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Controller for a
    
  def append_info_to_payload(payload)
    super

    return unless action_name == 'show' && @diffs.present?

    payload[:metadata] ||= {}
    payload[:metadata]['meta.diffs_files_count'] = @diffs.size
  end