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Rails is Just Ruby
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Jesse Wolgamott
April 29, 2013
Programming
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Rails is Just Ruby
RailsConf 2013 - Intro Track
Jesse Wolgamott
April 29, 2013
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Transcript
Ruby is Just Rails A Guide to Procrastination and Happiness
Stu Rails makes insanely easy Seemingly Magical
Protect entire system from unauthorized requests Seemingly Magical
Log every page load Seemingly Magical
Update full-text search engine every time a record is added
Seemingly Magical
it’s not magic Magic It’s not magic (maybe at first)
http:/ /lotr.wikia.com/wiki/File:Gandalf-2.jpg
http:/ /www.ibeta.eu/blog/darth-vader-on-tedxeutropolis/
Wizard Like Powers Business People consider us wizards with our
ability to create business value
Rails Helps us Along Rails helps us along
Rails Helps us Along Blocks
Rails Helps us Along Before Filters
Rails Helps us Along Callbacks
Rails Helps us Along Inheritance
Rails Helps us Along It all starts with a block
The Block
10.times do puts "YOLO" end
None
@users.each do |user| <%= user.email %> end
User.create do |u| u.name = 'jwo' end
@users.map {|u| u.total_due }.sum
Rails Helps us Along code that gets delayed and executed
later
Block Rules Every Ruby method can receive a block
Block Rules The method has to yield to the block
to be e ective
Block Rules Can take parameters and won’t scream if you
send in too few
args.each do |key,value| end
Advanced Blocks Advanced Block Tips
Block Rules Don’t use ‘return’ in a block
Block Rules Use Ruby’s implicit returns instead
Advanced Blocks Add retries for volatile actions
10.times.retry do SomeNetworkCommunicationThingyHere.new end https://github.com/schneems/rrrretry
Before Filters
Before Filters Used in Controllers
Before Filters Rails actions are your interactions with users (get/post
data)
Before Filters Can be before or after
Before Filters If your before filter returns, or redirects the
action won’t happen
before_filter do |controller| unless controller.send(:logged_in?) redirect_to new_login_url end end
class ApplicationController before_filter :authenticate_user def authenticate_user unless logged_in? redirect_to new_login_url
end end end
class PostsController < AppController # already secured end
class PublicPostsController < AppController skip_before_filter :authenticate_user end
Callbacks
About Callbacks Code you can define to run later works
in Models too
About Callbacks It’s like HollaBack, but not
Callback Example Stack Overflow Example: Downcasing email
class User < ActiveRecord::Base before_validation do |user| user.email = user.email.downcase
end end
Callback Example Real World Example: Full Text Searching (websolr)
class Post < ActiveRecord::Base searchable do text :title, :body end
end https://github.com/sunspot/sunspot
Post.search do fulltext 'best pizza' end https://github.com/sunspot/sunspot
after_destroy do |searchable| searchable.remove_from_index end https://github.com/sunspot/sunspot/blob/master/ sunspot_rails/lib/sunspot/rails/searchable.rb
Workshop Time
Workshop Create a beeper alert program
Workshop Criteria if alarm is critical, send SMS
Workshop Criteria if alarm is warning, send email
I’m JWo Thanks! @jwo Jesse Wolgamott.com