Bringing the Thunder with Thor Rails Generators for

Bringing the Thunder with Thor & Rails Generators for the Command Line *Boom*

Actual Summary • Thor (the ruby framework) • Rails Generators • Application Templates

What is Thor? *In practice, not so much.

Why Thor? • • You need a CLI options parser It’s already installed (Rails 3) Useful file and directory operations Creating a generator

Flavors of Code Gen ~/projects/myproject(master)$ rails g model Product name: string ~/projects$ rails new myproject -m stock_project. rb ~/projects/myproject(master)$ petstore upgrade

Key Resources • Thor: : Actions http: //rdoc. info/github/wycats/thor/master/Thor /Actions. html • Rails: : Generators http: //api. rubyonrails. org/classes/Rails/Gener ators/Actions. html • Writing/Overriding Generators http: //guides. rubyonrails. org/generators. html

Using Generators rails generate model Turtle name: string

Rolling your own rails g generator product

Product Generator

Templates

Key Points • All public methods are invoked in order of declaration • Private methods are available in the template • Can have inline or external templates • ‘working’ directory is always the root of the project

Thor: : Actions

Rails: : Generators: : Actions

Stupid Generator Tricks

Thor CLI Apps • Generating code can be done without a generator rails new MY_APP • Packaging as gem executable • Don’t need to clutter list of generators in projects • Example: A tool to upgrade to Rails 3