nifty rails 3.0 methods II

Daniel Willemse zo 27 jun 10

@Wijnand,
I have to agree with you, in that class methods you describe can do the same the scopes can. The only reason I can think of, is the one you would reject.

Now for the new methods I made a post on about a week ago.
I thought to myself, what would happen if i wrote a class method “order” and tried to use it on the class.
Here’s what I tried:

 
Class Invoice < ActiveRecord::Base
  def self.order
   return "new class method"
  end
end

Now, when I tried this in the console
with

>> Invoice.order

With

>> Invoice.order.where("id = ?", 1)

I got
NoMethodError: undefined method `where’ for new class method

Which was not unexpected.

However, when I tried Invoice.where(“id = ?”, 1).order
It returned the active record relation as if ignoring my own class method.

Keep this in mind when (for whatever reason you may have) overriding
certain class methods like order or where. Should you want to use your order method over the pre-defined rails one, you need to put that method first in line on your model like
Model.own_order_method.where(“arguments”)

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