Fix unintuitive behavior with multiple order and group clauses

[#4545 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

activerecord/lib/active_record/relation/calculations.rb

@@ -195,7 +195,7 @@ def execute_grouped_calculation(operation, column_name) #:nodoc:
 
       select_statement <<  ", #{group_field} AS #{group_alias}"
 
-      relation = select(select_statement).group(group)
+      relation = except(:group).select(select_statement).group(group)
 
       calculated_data = @klass.connection.select_all(relation.to_sql)
 

activerecord/lib/active_record/relation/query_methods.rb

@@ -162,13 +162,9 @@ def build_arel
       arel = arel.take(@limit_value) if @limit_value.present?
       arel = arel.skip(@offset_value) if @offset_value.present?
 
-      @group_values.uniq.each do |g|
-        arel = arel.group(g) if g.present?
-      end
+      arel = arel.group(*@group_values.uniq.select{|g| g.present?})
 
-      @order_values.uniq.each do |o|
-        arel = arel.order(Arel::SqlLiteral.new(o.to_s)) if o.present?
-      end
+      arel = arel.order(*@order_values.uniq.select{|o| o.present?}.map(&:to_s))
 
       selects = @select_values.uniq
 

activerecord/lib/active_record/relation/spawn_methods.rb

@@ -80,10 +80,15 @@ def apply_finder_options(options)
 
       options.assert_valid_keys(VALID_FIND_OPTIONS)
 
-      [:joins, :select, :group, :having, :order, :limit, :offset, :from, :lock, :readonly].each do |finder|
+      [:joins, :select, :group, :having, :limit, :offset, :from, :lock, :readonly].each do |finder|
         relation = relation.send(finder, options[finder]) if options.has_key?(finder)
       end
 
+      # Give precedence to newly-applied orders and groups to play nicely with with_scope
+      [:group, :order].each do |finder|
+        relation.send("#{finder}_values=", Array.wrap(options[finder]) + relation.send("#{finder}_values")) if options.has_key?(finder)
+      end
+
       relation = relation.where(options[:conditions]) if options.has_key?(:conditions)
       relation = relation.includes(options[:include]) if options.has_key?(:include)
       relation = relation.extending(options[:extend]) if options.has_key?(:extend)

activerecord/test/cases/base_test.rb

@@ -1994,6 +1994,16 @@ def test_find_multiple_ordered_last
     assert_equal last, Developer.find(:all, :order => 'developers.name, developers.salary DESC').last
   end
 
+  def test_find_keeps_multiple_order_values
+    combined = Developer.find(:all, :order => 'developers.name, developers.salary')
+    assert_equal combined, Developer.find(:all, :order => ['developers.name', 'developers.salary'])
+  end
+
+  def test_find_keeps_multiple_group_values
+    combined = Developer.find(:all, :group => 'developers.name, developers.salary, developers.id, developers.created_at, developers.updated_at')
+    assert_equal combined, Developer.find(:all, :group => ['developers.name', 'developers.salary', 'developers.id', 'developers.created_at', 'developers.updated_at'])
+  end
+
   def test_find_symbol_ordered_last
     last  = Developer.find :last, :order => :salary
     assert_equal last, Developer.find(:all, :order => :salary).last