Fix default_scope to work in combination with named scopes

Signed-off-by: David Heinemeier Hansson <david@loudthinking.com>

activerecord/lib/active_record/base.rb

@@ -2027,7 +2027,7 @@ def subclasses #:nodoc:
         #     default_scope :find => { :order => 'last_name, first_name' }
         #   end
         def default_scope(options = {})
-          self.default_scoping << { :find => options, :create => options.is_a?(Hash) ?  options[:conditions] : {} }
+          self.default_scoping << { :find => options, :create => (options.is_a?(Hash) && options.has_key?(:conditions)) ? options[:conditions] : {} }
         end
 
         # Test whether the given method and optional key are scoped.

activerecord/test/cases/method_scoping_test.rb

@@ -532,22 +532,22 @@ def test_default_scope
   end
 
   def test_default_scoping_with_threads
-    scope = [{:create=>nil, :find=>{:order=>"salary DESC"}}]
+    scope = [{ :create => {}, :find => { :order => 'salary DESC' } }]
 
     2.times do
       Thread.new { assert_equal scope, DeveloperOrderedBySalary.send(:scoped_methods) }.join
     end
   end
 
   def test_default_scoping_with_inheritance
-    scope = [{:create=>nil, :find=>{:order=>"salary DESC"}}]
+    scope = [{ :create => {}, :find => { :order => 'salary DESC' } }]
 
     # Inherit a class having a default scope and define a new default scope
     klass = Class.new(DeveloperOrderedBySalary)
     klass.send :default_scope, {}
 
     # Scopes added on children should append to parent scope
-    expected_klass_scope = [{:create=>nil, :find=>{:order=>"salary DESC"}}, {:create=>nil, :find=>{}}]
+    expected_klass_scope = [{ :create => {}, :find => { :order => 'salary DESC' }}, { :create => {}, :find => {} }]
     assert_equal expected_klass_scope, klass.send(:scoped_methods)
 
     # Parent should still have the original scope
@@ -568,6 +568,12 @@ def test_nested_scope
     assert_equal expected, received
   end
 
+  def test_named_scope
+    expected = Developer.find(:all, :order => 'name DESC').collect { |dev| dev.salary }
+    received = DeveloperOrderedBySalary.by_name.find(:all).collect { |dev| dev.salary }
+    assert_equal expected, received
+  end
+
   def test_nested_exclusive_scope
     expected = Developer.find(:all, :limit => 100).collect { |dev| dev.salary }
     received = DeveloperOrderedBySalary.with_exclusive_scope(:find => { :limit => 100 }) do

activerecord/test/models/developer.rb

@@ -79,13 +79,13 @@ def raise_if_projects_empty!
 end
 
 class DeveloperOrderedBySalary < ActiveRecord::Base
-    self.table_name = 'developers'
-    default_scope :order => "salary DESC"
+  self.table_name = 'developers'
+  default_scope :order => 'salary DESC'
+  named_scope :by_name, :order => 'name DESC'
 
-    def self.all_ordered_by_name
-      with_scope(:find => { :order => "name DESC" }) do
-        find(:all)
-      end
+  def self.all_ordered_by_name
+    with_scope(:find => { :order => 'name DESC' }) do
+      find(:all)
     end
-
+  end
 end