Merge pull request #7176 from bogdan/reverse_order

AR::Relation#order: make new order prepend old one.

activerecord/CHANGELOG.md

 ## Rails 4.0.0 (unreleased) ##
 
+*   AR::Relation#order: make new order prepend old one.
+
+        User.order("name asc").order("created_at desc")
+        # SELECT * FROM users ORDER BY created_at desc, name asc
+
+    This also affects order defined in `default_scope` or any kind of associations.
+
+    *Bogdan Gusiev*
+
 *   `Model.all` now returns an `ActiveRecord::Relation`, rather than an
     array of records. Use `Model.to_a` or `Relation#to_a` if you really
     want an array.

activerecord/lib/active_record/relation/finder_methods.rb

@@ -311,7 +311,7 @@ def find_first
         @records.first
       else
         @first ||=
-          if order_values.empty? && primary_key
+          if with_default_scope.order_values.empty? && primary_key
             order(arel_table[primary_key].asc).limit(1).to_a.first
           else
             limit(1).to_a.first

activerecord/lib/active_record/relation/query_methods.rb

@@ -214,7 +214,7 @@ def order!(*args)
       references.map! { |arg| arg =~ /^([a-zA-Z]\w*)\.(\w+)/ && $1 }.compact!
       references!(references) if references.any?
 
-      self.order_values += args
+      self.order_values = args + self.order_values
       self
     end
 
@@ -226,7 +226,7 @@ def order!(*args)
     #
     #   User.order('email DESC').reorder('id ASC').order('name ASC')
     #
-    # generates a query with 'ORDER BY id ASC, name ASC'.
+    # generates a query with 'ORDER BY name ASC, id ASC'.
     def reorder(*args)
       args.blank? ? self : spawn.reorder!(*args)
     end

activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb

@@ -513,9 +513,9 @@ def test_dynamic_find_should_respect_association_order
     assert_equal high_id_jamis, projects(:active_record).developers.find_by_name('Jamis')
   end
 
-  def test_find_should_append_to_association_order
+  def test_find_should_prepend_to_association_order
     ordered_developers = projects(:active_record).developers.order('projects.id')
-    assert_equal ['developers.name desc, developers.id desc', 'projects.id'], ordered_developers.order_values
+    assert_equal ['projects.id', 'developers.name desc, developers.id desc'], ordered_developers.order_values
   end
 
   def test_dynamic_find_all_should_respect_readonly_access

activerecord/test/cases/associations/has_many_associations_test.rb

@@ -231,9 +231,9 @@ def test_find_many_with_merged_options
     assert_equal 2, companies(:first_firm).limited_clients.limit(nil).to_a.size
   end
 
-  def test_find_should_append_to_association_order
+  def test_find_should_prepend_to_association_order
     ordered_clients =  companies(:first_firm).clients_sorted_desc.order('companies.id')
-    assert_equal ['id DESC', 'companies.id'], ordered_clients.order_values
+    assert_equal ['companies.id', 'id DESC'], ordered_clients.order_values
   end
 
   def test_dynamic_find_should_respect_association_order

activerecord/test/cases/relation_scoping_test.rb

@@ -385,7 +385,7 @@ def test_default_scope_with_multiple_calls
   end
 
   def test_scope_overwrites_default
-    expected = Developer.all.merge!(:order => 'salary DESC, name DESC').to_a.collect { |dev| dev.name }
+    expected = Developer.all.merge!(:order => ' name DESC, salary DESC').to_a.collect { |dev| dev.name }
     received = DeveloperOrderedBySalary.by_name.to_a.collect { |dev| dev.name }
     assert_equal expected, received
   end
@@ -397,13 +397,13 @@ def test_reorder_overrides_default_scope_order
   end
 
   def test_order_after_reorder_combines_orders
-    expected = Developer.order('name DESC, id DESC').collect { |dev| [dev.name, dev.id] }
+    expected = Developer.order('id DESC, name DESC').collect { |dev| [dev.name, dev.id] }
     received = Developer.order('name ASC').reorder('name DESC').order('id DESC').collect { |dev| [dev.name, dev.id] }
     assert_equal expected, received
   end
 
-  def test_order_in_default_scope_should_prevail
-    expected = Developer.all.merge!(:order => 'salary desc').to_a.collect { |dev| dev.salary }
+  def test_order_in_default_scope_should_not_prevail
+    expected = Developer.all.merge!(:order => 'salary').to_a.collect { |dev| dev.salary }
     received = DeveloperOrderedBySalary.all.merge!(:order => 'salary').to_a.collect { |dev| dev.salary }
     assert_equal expected, received
   end

activerecord/test/cases/relations_test.rb

@@ -165,7 +165,7 @@ def test_finding_last_with_arel_order
   end
 
   def test_finding_with_order_concatenated
-    topics = Topic.order('author_name').order('title')
+    topics = Topic.order('title').order('author_name')
     assert_equal 4, topics.to_a.size
     assert_equal topics(:fourth).title, topics.first.title
   end
@@ -1068,20 +1068,20 @@ def test_order_by_relation_attribute
   end
 
   def test_default_scope_order_with_scope_order
-    assert_equal 'zyke', CoolCar.order_using_new_style.limit(1).first.name
-    assert_equal 'zyke', FastCar.order_using_new_style.limit(1).first.name
+    assert_equal 'honda', CoolCar.order_using_new_style.limit(1).first.name
+    assert_equal 'honda', FastCar.order_using_new_style.limit(1).first.name
   end
 
   def test_order_using_scoping
     car1 = CoolCar.order('id DESC').scoping do
       CoolCar.all.merge!(:order => 'id asc').first
     end
-    assert_equal 'zyke', car1.name
+    assert_equal 'honda', car1.name
 
     car2 = FastCar.order('id DESC').scoping do
       FastCar.all.merge!(:order => 'id asc').first
     end
-    assert_equal 'zyke', car2.name
+    assert_equal 'honda', car2.name
   end
 
   def test_unscoped_block_style

guides/source/active_record_querying.textile

@@ -492,7 +492,7 @@ This code will generate SQL like this:
 SELECT * FROM clients WHERE (clients.orders_count IN (1,3,5))
 </sql>
 
-h3. Ordering
+h3(#ordering). Ordering
 
 To retrieve records from the database in a specific order, you can use the +order+ method.
 
@@ -518,6 +518,13 @@ Client.order("orders_count ASC, created_at DESC")
 Client.order("orders_count ASC", "created_at DESC")
 </ruby>
 
+If you want to call +order+ multiple times e.g. in different context, new order will prepend previous one
+
+<ruby>
+Client.order("orders_count ASC").order("created_at DESC")
+# SELECT * FROM clients ORDER BY created_at DESC, orders_count ASC
+</ruby>
+
 h3. Selecting Specific Fields
 
 By default, <tt>Model.find</tt> selects all the fields from the result set using +select *+.

guides/source/upgrading_ruby_on_rails.textile

@@ -42,6 +42,8 @@ h4(#active_record4_0). Active Record
 
 The <tt>delete</tt> method in collection associations can now receive <tt>Fixnum</tt> or <tt>String</tt> arguments as record ids, besides records, pretty much like the <tt>destroy</tt> method does. Previously it raised <tt>ActiveRecord::AssociationTypeMismatch</tt> for such arguments. From Rails 4.0 on <tt>delete</tt> automatically tries to find the records matching the given ids before deleting them.
 
+Rails 4.0 has changed how orders get stacked in +ActiveRecord::Relation+. In previous versions of rails new order was applied after previous defined order. But this is no long true. Check "ActiveRecord Query guide":active_record_querying.html#ordering for more information.
+
 h4(#active_model4_0). Active Model
 
 Rails 4.0 has changed how errors attach with the <tt>ActiveModel::Validations::ConfirmationValidator</tt>. Now when confirmation validations fail the error will be attached to <tt>:#{attribute}_confirmation</tt> instead of <tt>attribute</tt>.