On 22 Dec 2008, at 19:09, Sarah Allen wrote:
I realize this is off-topic for the RSpec forum and cucumber tutorial,
but I'm hoping you'll enlighten me on this point which is, I guess,
more
of a Ruby language question...
My Task model is simply defined (by the generate scaffold script) as:
class Task < ActiveRecord::Base
end
How is it that I can call Task.create! which is a method of
ActiveRecord::Validations ?
ActiveRecord::Validations uses a trick that's used widely in rails,
and is arguably[1] becoming a Ruby idiom, apparently.
This is the interesting bit, around line #275:
def self.included(base) # :nodoc:
base.extend ClassMethods
So basically that means that when the class ActiveRecord::Base
includes the module ActiveRecord::Validations, that module extends the
thing which included it (in this case ActiveRecord::Base) with the
class methods defined in ActiveRecords::Validations::ClassMethods.
Does that make sense?
I highly recommend reading David A Black's 'Ruby for Rails' at this
point in your learnings. It did me a world of good when I was
similarly new to Ruby. It's a really good deep grounding in Ruby IMO.
[1]http://blog.jayfields.com/2006/12/ruby-instance-and-class-methods-from.html
Matt Wynne
http://blog.mattwynne.net
http://www.songkick.com
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