I have a scope that I want to take the first element from, then iterate over the rest of its contents.

I would expect calling #shift would return the current element and skip to the next one in the collection, but it does not skip to the next element.

describe "#shift" do

1. PASSES
   it "returns the current value" do
   @person.addresses.criteria.shift.number.should == 1
   end

1. FAILS
   it "skips to the next value" do
   @person.addresses.criteria.shift
   @person.addresses.criteria.first.number.should == 2
   end

end