Are `return` and `break` useless inside a Ruby block when used as a callback?
- by Skilldrick
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
