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: model.rb
    path of file: ./repos/padrino-framework/padrino-gen/lib/padrino-gen/generators
    
    the code of the file until where you have to start completion: module Padrino
  module Generators
    ##
    # Responsible for generating new models for the specified ORM component.
    #
    class Model < Thor::Group
      Padrino::Generators.add_generator(:model, self)

      def self.source_root; File.expand_path(File.dirname(__FILE__)); end
      def self.banner; "padrino-gen model [name] [fields]"; end

      include Thor::Actions
      include Padrino::Generators::Actions
      include Padrino::Generators::Components::Actions

      desc "Description:\n\n\tpadrino-gen model generates a new model and migration files"

      argument :name,               :desc => 'The name of your padrino model'
      argument :fields,             :desc => 'The fields for the model',                                     :default => [],    :type => :array
      class_option :root,           :desc => 'The root destination',                       :aliases => '-r', :default => '.',   :type => :string
      class_option :app,            :desc => 'The application destination path',           :aliases => '-a', :default => '.',   :type => :string
      class_option :destroy,                                                               :aliases => '-d', :default => false, :type => :boolean
      class_option :skip_migration,                                                        :aliases => '-s', :default => false, :type => :boolean
      class_option :force,          :desc => 'Generate model files if app already exists', :aliases => '-f', :default => false, :type => :boolean

      # Show help if no ARGV given.
      require_arguments!

      # Execute the model generation.
      #
      def create_model
        app = options[:app]
        return unless valid_model_for?(app)

        include_component_module_for(:test)
        migration_name = "create_#{name.pluralize.underscore}"
        apply_default_fields fields
        create_model_file(name, :fields => fields, :app => app)
        generate_model_test(name) if test?
        create_model_migration(migration_name, name, fields) unless options[:skip_migration]
      end

      private

      ##
      # Validate model characteristics
      # Alert if the model name is being used
      #
      def valid_model_for?(app)
        self.destination_root = options[:root]
        return false unless correct_path?

        check_app_existence(app)

        if options[:destroy]
          self.behavior = :revoke
        else
          unless options[:force]
            say "#{@camel_name} already exists."
            say "Please, change the name."
            return false
          end
        end if model_name_already_exists?

        return false if 
    
      def self.source_root; File.expand_path(File.dirname(__FILE__)); end
      def self.banner; "padrino-gen model [name] [fields]"; end

      include Thor::Actions
      include Padrino::Generators::Actions
      include Padrino::Generators::Components::Actions

      desc "Description:\n\n\tpadrino-gen model generates a new model and migration files"

      argument :name,               :desc => 'The name of your padrino model'
      argument :fields,             :desc => 'The fields for the model',                                     :default => [],    :type => :array
      class_option :root,           :desc => 'The root destination',                       :aliases => '-r', :default => '.',   :type => :string
      class_option :app,            :desc => 'The application destination path',           :aliases => '-a', :default => '.',   :type => :string
      class_option :destroy,                                                               :aliases => '-d', :default => false, :type => :boolean
      class_option :skip_migration,                                                        :aliases => '-s', :default => false, :type => :boolean
      class_option :force,          :desc => 'Generate model files if app already exists', :aliases => '-f', :default => false, :type => :boolean

      # Show help if no ARGV given.
      require_arguments!

      # Execute the model generation.
      #
      def create_model
        app = options[:app]
        return unless valid_model_for?(app)

        include_component_module_for(:test)
        migration_name = "create_#{name.pluralize.underscore}"
        apply_default_fields fields
        create_model_file(name, :fields => fields, :app => app)
        generate_model_test(name) if test?
        create_model_migration(migration_name, name, fields) unless options[:skip_migration]
      end

      private

      ##
      # Validate model characteristics
      # Alert if the model name is being used
      #
      def valid_model_for?(app)
        self.destination_root = options[:root]
        return false unless correct_path?

        check_app_existence(app)

        if options[:destroy]
          self.behavior = :revoke
        else
          unless options[:force]
            say "#{@camel_name} already exists."
            say "Please, change the name."
            return false
          end
        end if model_name_already_exists?

        return false if has_invalid_fields?

        check_orm
      end

      ##
      # Return false if the model name is being used
      #
      def model_name_already_exists?
        @camel_name = name.to_s.underscore.camelize

        @project_name = ""
        @project_name = fetch_project_name

        return false unless already_exists?(@camel_name, @project_name)
        true
      end

      ##
      # Alert if there is not an ORM Adapter
      #
      def check_orm
        return true if include_component_module_for(:orm)

        say "<= You need an ORM adapter for run this generator. Sorry!"
        raise SystemExit
      end

      ##
      # Check app path
      #
      def correct_path?
        return true if in_app_root?
        say 'You are not at the root of a Padrino application! (config/boot.rb not found)'
        false
      end

      ##
      # Check if the fields are valid
      #
      def has_invalid_fields?
        if invalids = invalid_fields(fields)
          say 'Invalid field name:', :red
          say " #{invalids.join(", ")}"
        end
      end