Active Record loves blocks

	#http://blog.plataformatec.com.br/page/3/
	#Active Record associations also love blocks
	#We talked about using blocks when building an Active Record object using new or create, but associations like belongs_to or #has_many also work with that, when calling build or create on them:
	class User < ActiveRecord::Base
	has_many :posts
	end
	class Post < ActiveRecord::Base
	belongs_to :user
	end
	# has_many
	user = User.first
	user.posts.build do |post|
	post.title = "Active Record <3 Blocks"
	post.body = "I can give tap a break! <3 <3 <3"
	end
	# belongs_to
	post = Post.first
	post.build_user do |user|
	user.name = "John Doe <3 blocks"
	user.username = "john.doe"
	user.password = "john123"
	end

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