From: Cliff Kachinske <cjkske@...>
Date: 2011-01-07T13:22:17+09:00
Subject: Re: Block variable - How is it read in English?

If you are running OSX/*n*x you can learn more by opening a terminal 
session and issuing this:

ri ActiveRecord::Migration

It will pull up a very helpful document.

I don't recall if ri is bundled with the distribution for Ruby < 1.9.

But if you are following the rails tutorial, you already know how to use 
gems to install it.


SW Engineer wrote in post #972878:
> Following the "Ruby on Rails Tutorial", and under section "6.1.1
> Database migrations"
> http://railstutorial.org/chapters/modeling-and-viewing-users-one#top
>
> There is the following migration:
>
> class CreateUsers < ActiveRecord::Migration
>   def self.up
>     create_table :users do |t|
>       t.string :name
>       t.string :email
> .
> .
> .
>
> How do we read this line in English?
>
> create_table :users do |t|
>
> Why should we write the following line with "t."?
>
> t.string :name
>
> I know that block variables are used to pass parameters, but what is it
> trying to tell us here?
>
> So the "do |t|" part is actually the part that is confusing me.
>
> Any clarifications would be appreciated.
>
> Thanks.

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