Merge pull request #2007 from amatsuda/having_vargs_nomethoderror_fix

having() raises NoMethodError: undefined method `empty?' when the given argument does not respond to empty?

activerecord/lib/active_record/relation/query_methods.rb

@@ -96,11 +96,11 @@ def where(opts, *rest)
       relation
     end
 
-    def having(*args)
-      return self if args.blank?
+    def having(opts, *rest)
+      return self if opts.blank?
 
       relation = clone
-      relation.having_values += build_where(*args)
+      relation.having_values += build_where(opts, rest)
       relation
     end
 

activerecord/test/cases/finder_test.rb

@@ -140,23 +140,30 @@ def test_find_all_with_limit_and_offset_and_multiple_order_clauses
 
 
   def test_find_with_group
-    developers =  Developer.find(:all, :group => "salary", :select => "salary")
+    developers = Developer.find(:all, :group => "salary", :select => "salary")
     assert_equal 4, developers.size
     assert_equal 4, developers.map(&:salary).uniq.size
   end
 
   def test_find_with_group_and_having
-    developers =  Developer.find(:all, :group => "salary", :having => "sum(salary) >  10000", :select => "salary")
+    developers = Developer.find(:all, :group => "salary", :having => "sum(salary) > 10000", :select => "salary")
     assert_equal 3, developers.size
     assert_equal 3, developers.map(&:salary).uniq.size
-    assert developers.all? { |developer|  developer.salary > 10000 }
+    assert developers.all? { |developer| developer.salary > 10000 }
   end
 
   def test_find_with_group_and_sanitized_having
-    developers =  Developer.find(:all, :group => "salary", :having => ["sum(salary) > ?", 10000], :select => "salary")
+    developers = Developer.find(:all, :group => "salary", :having => ["sum(salary) > ?", 10000], :select => "salary")
     assert_equal 3, developers.size
     assert_equal 3, developers.map(&:salary).uniq.size
-    assert developers.all? { |developer|  developer.salary > 10000 }
+    assert developers.all? { |developer| developer.salary > 10000 }
+  end
+
+  def test_find_with_group_and_sanitized_having_method
+    developers = Developer.group(:salary).having("sum(salary) > ?", 10000).select('salary').all
+    assert_equal 3, developers.size
+    assert_equal 3, developers.map(&:salary).uniq.size
+    assert developers.all? { |developer| developer.salary > 10000 }
   end
 
   def test_find_with_entire_select_statement