add length to ActiveRecord::Result

activerecord/lib/active_record/result.rb

@@ -42,6 +42,10 @@ module ActiveRecord
       @column_types = column_types
     end
 
+    def length
+      @rows.length
+    end
+
     def each
       if block_given?
         hash_rows.each { |row| yield row }

activerecord/test/cases/result_test.rb

@@ -10,6 +10,10 @@ module ActiveRecord
       ])
     end
 
+    test "length" do
+      assert_equal 3, result.length
+    end
+
     test "to_hash returns row_hashes" do
       assert_equal [
         {'col_1' => 'row 1 col 1', 'col_2' => 'row 1 col 2'},