MerbCamp 2008 - getting started guide

1. Damage Control
Brock Whitten (sintaxi)

2. if rails.is_ghetto?
merb = ????
end

3. choice => two kinds
1) pick your tools
ORM, JavaScript, Testing, Template Engine, Server
2) size it to fit
Cache, Helpers, Mailer, Database?

4. plugins/slices/gems

5. plugins/slices/gems
...are all gems

6. plugins/slices/gems
...are all gems. WTF?

7. freeze
> gem install RedCloth -i gems

8. freeze
> gem install RedCloth -i gems
/gems /bin
/cache
/doc
/gems
/RedCloth-4.0.4
/specifications

9. configuration
/config database.yml
dependencies.rb
init.rb
rack.rb
router.rb

10. dependencies.rb
dependency “RedCloth”, “4.0.4”
dependency “BlueCloth”, “1.0.0”
dependency “coderay”, “0.7.4”

11. init.rb
require 'config/dependencies.rb'
use_orm :datamapper
use_test :rspec
use_template_engine :erb
Merb::Config.use do |c|
c[:use_mutex] = false
c[:session_store] = 'datamapper'
c[:session_secret_key] = '1205346b9baa87cf8e31ac0971'
c[:session_id_key] = '_session_id'
end
Merb::BootLoader.before_app_loads do
# ...
end
Merb::BootLoader.after_app_loads do
# ...

12. an opinionated merb
helpers
datamapper
rspec
merb-auth
sqlite3
jquery.js

13. merb stack
> sudo gem install merb

14. merb stack
> sudo gem install merb
gems = [
[quot;merb-corequot;, quot;~> #{GEM_VERSION}quot;],
[quot;merb-morequot;, quot;~> #{GEM_VERSION}quot;],
[quot;dm-corequot;, quot;~> 0.9.6quot;],
[quot;do_sqlite3quot;, quot;~> 0.9.6quot;],
[quot;dm-timestampsquot;, quot;~> 0.9.6quot;],
[quot;dm-typesquot;, quot;~> 0.9.6quot;],
[quot;dm-aggregatesquot;, quot;~> 0.9.6quot;],
[quot;dm-migrationsquot;, quot;~> 0.9.6quot;],
[quot;dm-validationsquot;, quot;~> 0.9.6quot;],
[quot;dm-sweatshopquot;, quot;~> 0.9.6quot;]
]

15. merb stack
> merb-gen app my_blog
> merb-gen resource article
> rake db:automigrate
> merb

16. config/router.rb
Merb::Router.prepare do
resources :articles
default_routes
match('/').to(:controller => 'articles', :action =>'index')
end

17. models/user.rb
class User
include DataMapper::Resource
Merb::Authentication.user_class = self
property :id, Serial
property :login, String
end

18. controllers/articles.rb
class Article < Application
provides :xml, :yaml, :js
before :ensure_authenticated
def show
@article = Article.get(params[:id])
raise NotFound unless @article
display @article
end
end

19. DataMapper
# queries
Article.all
Article.first :order => [:created_at.desc]
Article.get(params[:id])
#validations
validates_present :title
validates_is_number :rating
#associations
has n, :comments
belongs_to :blog
has 1, :author

20. deploy
> merb -e production -c 4 -p 9000

21. OSIM!

22. tools
textmate bundle
git://github.com/drnic/merb-tmbundle.git
wiki
http://wiki.merbivore.com/
irc
http://irc.freenode.net/ #merb
http://irc.freenode.net/ #datamapper

23. gem install thor
http://merbunity.com/tutorials/18

24. questions?