Merge pull request #4282 from edgecase/order_after_reorder

correctly handle order calls after a reorder

activerecord/lib/active_record/relation.rb

@@ -8,7 +8,7 @@ class Relation
     JoinOperation = Struct.new(:relation, :join_class, :on)
     ASSOCIATION_METHODS = [:includes, :eager_load, :preload]
     MULTI_VALUE_METHODS = [:select, :group, :order, :joins, :where, :having, :bind]
-    SINGLE_VALUE_METHODS = [:limit, :offset, :lock, :readonly, :from, :reorder, :reverse_order, :uniq]
+    SINGLE_VALUE_METHODS = [:limit, :offset, :lock, :readonly, :from, :reordering, :reverse_order, :uniq]
 
     include FinderMethods, Calculations, SpawnMethods, QueryMethods, Batches, Explain, Delegation
 

activerecord/lib/active_record/relation/finder_methods.rb

@@ -134,7 +134,7 @@ def first!
     def last(*args)
       if args.any?
         if args.first.kind_of?(Integer) || (loaded? && !args.first.kind_of?(Hash))
-          if order_values.empty? && reorder_value.nil?
+          if order_values.empty?
             order("#{primary_key} DESC").limit(*args).reverse
           else
             to_a.last(*args)
@@ -249,7 +249,7 @@ def apply_join_dependency(relation, join_dependency)
     end
 
     def construct_limited_ids_condition(relation)
-      orders = (relation.reorder_value || relation.order_values).map { |val| val.presence }.compact
+      orders = relation.order_values.map { |val| val.presence }.compact
       values = @klass.connection.distinct("#{@klass.connection.quote_table_name table_name}.#{primary_key}", orders)
 
       relation = relation.dup

activerecord/lib/active_record/relation/query_methods.rb

@@ -9,7 +9,7 @@ module QueryMethods
                   :select_values, :group_values, :order_values, :joins_values,
                   :where_values, :having_values, :bind_values,
                   :limit_value, :offset_value, :lock_value, :readonly_value, :create_with_value,
-                  :from_value, :reorder_value, :reverse_order_value,
+                  :from_value, :reordering_value, :reverse_order_value,
                   :uniq_value
 
     def includes(*args)
@@ -97,7 +97,8 @@ def reorder(*args)
       return self if args.blank?
 
       relation = clone
-      relation.reorder_value = args.flatten
+      relation.reordering_value = true
+      relation.order_values = args.flatten
       relation
     end
 
@@ -263,7 +264,7 @@ def build_arel
 
       arel.group(*@group_values.uniq.reject{|g| g.blank?}) unless @group_values.empty?
 
-      order = @reorder_value ? @reorder_value : @order_values
+      order = @order_values
       order = reverse_sql_order(order) if @reverse_order_value
       arel.order(*order.uniq.reject{|o| o.blank?}) unless order.empty?
 

activerecord/lib/active_record/relation/spawn_methods.rb

@@ -22,7 +22,7 @@ def merge(r)
         end
       end
 
-      (Relation::MULTI_VALUE_METHODS - [:joins, :where]).each do |method|
+      (Relation::MULTI_VALUE_METHODS - [:joins, :where, :order]).each do |method|
         value = r.send(:"#{method}_values")
         merged_relation.send(:"#{method}_values=", merged_relation.send(:"#{method}_values") + value) if value.present?
       end
@@ -48,7 +48,7 @@ def merge(r)
 
       merged_relation.where_values = merged_wheres
 
-      (Relation::SINGLE_VALUE_METHODS - [:lock, :create_with]).each do |method|
+      (Relation::SINGLE_VALUE_METHODS - [:lock, :create_with, :reordering]).each do |method|
         value = r.send(:"#{method}_value")
         merged_relation.send(:"#{method}_value=", value) unless value.nil?
       end
@@ -57,6 +57,15 @@ def merge(r)
 
       merged_relation = merged_relation.create_with(r.create_with_value) unless r.create_with_value.empty?
 
+      if (r.reordering_value)
+        # override any order specified in the original relation
+        merged_relation.reordering_value = true
+        merged_relation.order_values = r.order_values
+      else
+        # merge in order_values from r
+        merged_relation.order_values += r.order_values
+      end
+
       # Apply scope extension modules
       merged_relation.send :apply_modules, r.extensions
 

activerecord/test/cases/relation_scoping_test.rb

@@ -421,6 +421,12 @@ def test_reorder_overrides_default_scope_order
     assert_equal expected, received
   end
 
+  def test_order_after_reorder_combines_orders
+    expected = Developer.order('name DESC, id 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_nested_exclusive_scope
     expected = Developer.find(:all, :limit => 100).collect { |dev| dev.salary }
     received = DeveloperOrderedBySalary.send(:with_exclusive_scope, :find => { :limit => 100 }) do

activerecord/test/cases/relation_test.rb

@@ -20,7 +20,7 @@ def test_construction
     end
 
     def test_single_values
-      assert_equal [:limit, :offset, :lock, :readonly, :from, :reorder, :reverse_order, :uniq].map(&:to_s).sort,
+      assert_equal [:limit, :offset, :lock, :readonly, :from, :reordering, :reverse_order, :uniq].map(&:to_s).sort,
         Relation::SINGLE_VALUE_METHODS.map(&:to_s).sort
     end