1. Section led by Ivan Lee Reachable at ivan period lee at cs period stanford period edu 1

2. { :action => “train" } do |f| %> Name: 2

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4. In your controller… Access using params[:ninjaTurtle][:name] Ex: If params[:ninjaTurtle][:name] == ‘turtle’ flash[:warning] = “Your turtle needs a better name!” # see how “flash” is displayed a few slides down end 4

5. {:action => :photoPost}, :html => { :multipart => true }) do |form| %> 5

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7. You can treat it as a global variable session["login_id"] = user.id; If session["login_id"] == nil… Can store all sorts of fun stuff in the session But when you’re all done, clean up! reset_session 7

8. Usage if (dont_want_to_reload_page) render(:controller => turtles, :action => :attack) end Note: “:action” renders the view with the same name as the action 8

9. From the Rails book, pg. 397 Many forms require a user to enter some piece of information twice, the second copy acting as a confirmation that the first was not mistyped. If you use the naming convention that the second field has the name of the attribute with _confirmation appended, you can use validates_confirmation_of to check that the two fields have the same value. The second field need not be stored in the database. 9

10. Ex (if you really wanted to ensure the Ninja Turtle’s favorite color): class Turtle < ActiveRecord::Base validates_confirmation_of :color end 10

11. if (there_is_a_post_error) @errorMessage = “You can’t do that!” render(:action => previousAction) return end 11

12. To look something up in the database by multiple fields, use Model.find(:first, :conditions => { … } ) Write out a map of what redirects where Last part: basically don’t use self.method Def method NOT Def MyClass.method or def self.method Make your layouts prettier – this helps with frustration when debugging “but it still looks so nice!” 12

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