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Note It won t be immediately useful to you, but it s worth noting that both keys and values can be objects

If you look at the lines that start with create, you ll see that the generator created an event model, an event test, an events fixture (which is a textual representation of table data that you can use for testing), and a migration named 001_create_events.rb. With that, our model is generated.

of any type. Therefore, it s possible to use an array (or even another hash) as a key. This might come in useful when you re dealing with more complex data structures in the future.

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We need to create a table in the database. We could do this with a database administration tool, or even manually using SQL, but Rails provides a much more efficient facility for table creation and maintenance called migrations. It s called a migration because it allows you to evolve, or migrate, your schema over time. (If you re not familiar with databases, tables, and SQL, consult Appendix B for the basics.) Schema is the term given to the properties that make up a table: the table s name, its columns, and column types, as well as any default values a column is to have. And what s the best part about migrations You get to define your schema in pure Ruby. This is all part of the Rails philosophy that you should stick to one language when developing. It helps eliminate context switching and results in higher productivity. As you can see from the output of the model generator, it created a new file in db/ migrate called 001_create_events.rb. Notice that migrations are named with a numeric prefix, starting at 001. Since migrations are run sequentially, this number represents their position in the queue. Let s open this file and take a peek. It s shown in Listing 3-2.

With arrays, you can use the each method to iterate through each element of the array. You can do the same with hashes: x = { "a" => 1, "b" => 2 } x.each { |key, value| puts "#{key} equals #{value}" }

Symbols aren t a common feature in most languages. However, as you learn when reading this book, they re extremely useful. Symbol is a data type that starts with a colon, like :controller. You can think of symbols as little named pointers (if you re a C programmer). They re used to point at some data that isn t a traditional String object, in a human-readable format. In fact, they re almost like strings, except you can t modify them: irb(main):001:0> => :my_symbol :my_symbol

Note In Ruby 1.8, there is no guarantee that elements will be returned in a specific order. In Ruby 1.9,

class CreateEvents < ActiveRecord::Migration def self.up create_table :events do |t| end end def self.down drop_table :events end end

however, the order in which the elements were inserted into the hash will be remembered, and each will return them in that order.

irb(main):002:0> :my_symbol + :second NoMethodError: undefined method `+' for :my_symbol:Symbol from (irb):2 from /usr/bin/irb:15:in `<main>' irb(main):003:0> "my_string" + "second" => "my_stringsecond" In computer science, we refer to this condition as being immutable, which is a fancy way of saying you can t modify something. Use symbols when you want to name something nicely, and you don t want it changed at all for example, by having something appended to the end of it. You can even use symbols in method calls, as Rails does frequently. Because Ruby allows you to omit the braces when passing hashes as method arguments (as long as the hash is either the only argument or the last argument), this has the effect of creating what look like named arguments: has_many :users, :class_name => "Person" Here, you use the :users and :class_name symbols to point at some data. Specifically, you re using them to tell ActiveRecord::Base.has_many what type of relationship it should have with the Person class.

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