TrainSet is a lightweight MVC framework inspired by Ruby on Rails. Also included is TapeDeck, a lightweight ORM inspired by ActiveRecord. TrainSet provides ControllerBase and Router, which provide a base controller class and basic routing capabilities respectively. TapeDeck provides TapeDeck which gives access to associations

Classes that inherit TapeDeck have access to a number of ORM functions.

• parameters can be passed into the initializer or update_attributes as an options hash

sol = OS.new(name: 'Solaris', vendor:'Sun', model:'proprietary',license:'CDDL')
sol.update_attributes(vendor:'Oracle',license:'OTN')

• Models can optionally override valid? to provide input validation before inserting or updating to DB. The overriden function must return either true or false. Error messages can also be shoveled into errors.

def valid?
    if name.empty?
      errors['name'] = "Name cannot be blank"
      return false
    end
    true
end

• The model.save method will automatically either INSERT or UPDATE as needed.
• The following relations are provided:
  • belongs_to
  • has_many
  • has_one_through
  • has_many_through

class OS < TapeDeck
    #every model must finalize!
    self.finalize!

    belongs_to :vendor
    belongs_to :OS_Family,
      foreign_key: :os_family_id
    has_many_through :similar_operating_systems,
      through: :OS_Family,
      source: :operating_systems
end

Models are stores in the $project_dir/models/ folder

• render(template name) : will render the template located in $project_dir/views/$controller_name/ directory
• render_content(content, type): Will render custom content, such as JSON

render_content(data.to_json, "application/json")

• redirect_to(url)
• session: stores key/value pairs in the browser cookie.
• flash and flash.now: stores single-session cookies and same-session data respectively.

class OSController < TrainSet

  def new
    @os = OS.new
    render :new
  end

  def create
    @os = OS.new(params['OS'])
    if @os.save
      redirect_to "/os/#{os.id}"
    else
      flash.now[:errors]=@os.errors
      render :new
    end
  end

end

Controllers are stored in the $project_dir/controllers/ folder using snake_case naming.

TrainSet includes a lightweight router that can handle custom routes.

get Regexp.new("^/os$"), OSController, :index
get Regexp.new('^/os/(?<id>\\d+)/edit$'), OSController, :edit
put Regexp.new('^/os/(?<id>\\d+)$'), OSController, :update
get Regexp.new('^/os/(?<id>\\d+)$'), OSController, :show
get Regexp.new("^/os/new$"), OSController, :new
post Regexp.new("^/os$"), OSController, :create

Routes are added to the router.draw do block in the $project_dir/config/routes.rb file

A static assets middleware is provided. It will serve out of the public folder. By default it will recognize txt, jpg, png, and zip files. Additional MIME types can be added by appending to the MIME_TYPES constant in static.rb

1. bundle install
2. ruby ./bin/server.rb
3. Visit http://localhost:3000