Ensure Model#last doesn't affects order for another finders inside the same scope [#1499 state:resolved]

Signed-off-by: Pratik Naik <pratiknaik@gmail.com>

activerecord/lib/active_record/base.rb

@@ -1494,11 +1494,16 @@ module ActiveRecord #:nodoc:
           end
 
           if scoped?(:find, :order)
-            scoped_order = reverse_sql_order(scope(:find, :order))
-            scoped_methods.select { |s| s[:find].update(:order => scoped_order) }
+            scope = scope(:find)
+            original_scoped_order = scope[:order]
+            scope[:order] = reverse_sql_order(original_scoped_order)
           end
 
-          find_initial(options.merge({ :order => order }))
+          begin
+            find_initial(options.merge({ :order => order }))
+          ensure
+            scope[:order] = original_scoped_order if original_scoped_order
+          end
         end
 
         def reverse_sql_order(order_query)

activerecord/test/cases/method_scoping_test.rb

@@ -27,6 +27,24 @@ class MethodScopingTest < ActiveRecord::TestCase
     end
   end
 
+  def test_scoped_find_last
+    highest_salary = Developer.find(:first, :order => "salary DESC")
+
+    Developer.with_scope(:find => { :order => "salary" }) do
+      assert_equal highest_salary, Developer.last
+    end
+  end
+
+  def test_scoped_find_last_preserves_scope
+    lowest_salary = Developer.find(:first, :order => "salary ASC")
+    highest_salary = Developer.find(:first, :order => "salary DESC")
+
+    Developer.with_scope(:find => { :order => "salary" }) do
+      assert_equal highest_salary, Developer.last
+      assert_equal lowest_salary, Developer.first
+    end
+  end
+
   def test_scoped_find_combines_conditions
     Developer.with_scope(:find => { :conditions => "salary = 9000" }) do
       assert_equal developers(:poor_jamis), Developer.find(:first, :conditions => "name = 'Jamis'")