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The each iterator method for a hash passes two parameters into the code block: first, a key, and second, the value associated with that key. In this example, you assign them to variables called key and value and use string interpolation to display their contents on the screen.

In its initial, generated form, the migration is a blank canvas. But before we go any further, let s note a few important items. First, notice the class methods: up and down. For each migration, you define instructions for updating in the up method, and use the down method to roll back any changes. So, if you were to, say, create a new table in the up method, you would drop the table in the down method, thereby reversing your changes. In fact, that s exactly what the generator did for us already: The events table gets created on up and dropped on down. Pretty slick, isn t it

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Ch apt er 3 rUB Y S B U IL DING B L OC K S : Da t a , e X p r e S S I O N S , a N D F LO W C O N t r O L

Sometimes you have a lot of data that you need to keep track of maybe a list of students, users, or anything that you may keep in a collection. Ruby has two different types of container objects for storing collections: arrays and hashes. Arrays are part of almost every modern language. They keep information in order. You can ask for the first item or the last item, or put items in a certain order. You can think of an Array object as a long series of boxes in which you can put things. You define arrays by using the [] notation. Note that in Ruby, you always refer to the first element in an array as 0. Read carefully what happens here:

Note You can easily spot the difference between class and instance method definitions in a Ruby class

Sometimes you might not be interested in the values within a hash, but want to get a feel for what the hash contains. A great way to do this is to look at the keys. Ruby gives you an easy way to see the keys in any hash immediately, using the keys method: x = { "a" => 1, "b" => 2, "c" => 3 } p x.keys

["a", "b", "c"] keys returns an array of all the keys in the hash, and if you re ever in the mood, values will return an array of all the values in the hash, too. Generally, however, you ll look up values based on a key.

We ve gone ahead and filled out the details for you. Without having seen a migration before, you should be able to tell exactly what s going on by looking at Listing 3-3.

irb(main):001:0> array = ['Toronto', 'Miami', 'Paris'] => ["Toronto", "Miami", "Paris"] irb(main):002:0> => "Toronto" irb(main):003:0> => "New York" array[0] array[1]='New York'

Deleting hash elements is easy with the delete method. All you do is pass in a key as a parameter, and the element is removed: x = { "a" => 1, "b" => 2 } x.delete("a") p x

class CreateEvents < ActiveRecord::Migration def self.up create_table :events do |t| t.column :title, :string t.column :location, :string t.column :occurs_on, :date end end

{"b"=>2}

Let s say you want to delete any hash elements whose value is below a certain figure. Here s an example of how to do this: x = { "a" => 100, "b" => 20 } x.delete_if { |key, value| value < 25 } p x

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