In Rails, blocks can be used as callbacks, e.g.:

class User < ActiveRecord::Base
  validates_presence_of :login, :email

  before_create {|user| user.name = user.login.capitalize
    if user.name.blank?}
end

When a block is used like this, is there any use for break and return? I'm asking because normally in a block, break will break out of the loop, and return will return from the enclosing method. But in a callback context, I can't get my head round what that means.

The Ruby Programming Language suggests that return could cause a LocalJumpError but I haven't been able to reproduce this in a Rails callback.

Edit: with the following code I'd expect a LocalJumpError, but all the return does is stop the rest of the callback executing.

class User < ActiveRecord::Base
  validates_presence_of :login, :email

  before_create do |user|
    return
    user.name = user.login.capitalize
end