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: find_or_create_by_query.rb
    path of file: ./repos/forem/app/queries/consumer_apps
    
    the code of the file until where you have to start completion: module ConsumerApps
  class FindOrCreateByQuery
    def self.call(app_bund
    
    def call
      # This guard clause handles the Forem app special case
      return forem_consumer_app if @app_bundle == ConsumerApp::FOREM_BUNDLE

      # All other ConsumerApp are simply fetched as usual
      relation.find_by(app_bundle: @app_bundle)
    end