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: preview.rb
    path of file: ./repos/workarea/core/app/models/workarea/release
    
    the code of the file until where you have to start completion: module Workarea
  class Release
    class Preview
      attr_reader :release

      def initialize(release)
        @release = release
      end

      def releases

    
      def changesets_for(model)
        changesets.select do |changeset|
          # Check this way because loading the releasable will cause `load_release_changes`
          # to run this, resulting in a stack overflow.
          changeset.releasable_type == model.class.name &&
            changeset.releasable_id.to_s == model.id.to_s
        end
      end