Add way to get ordered deadlines in lab

app/models/lab.rb

@@ -63,4 +63,10 @@ def method_missing(meth, *args, &blk)
   def numbered_name
     "Lab #{number}"
   end
+
+  # Return all deadlines in ascending order
+  def ordered_deadlines
+    # So far we rely on the dd model to have default scope
+    default_deadlines.all
+  end
 end

spec/models/lab_spec.rb

@@ -96,6 +96,15 @@
     it "should have a list of deadlines" do
       build(:lab, default_deadlines: [create(:default_deadline)]).should have(1).default_deadlines
     end
+
+    it "should have a ascending list of deadlines" do
+      snd = build(:default_deadline_without_lab, at: 50.days.from_now)
+      fst = build(:default_deadline_without_lab, at: 20.days.from_now)
+
+      lab = create(:lab, default_deadlines: [snd, fst])
+      lab.should have(2).default_deadlines
+      lab.ordered_deadlines.first.should eq fst
+    end
   end
 
   describe "#active" do