1 files changed, 18 insertions, 4 deletions
diff --git a/activesupport/lib/active_support/ordered_hash.rb b/activesupport/lib/active_support/ordered_hash.rb
index 8d1c0f5160..4324e40cbb 100644
--- a/activesupport/lib/active_support/ordered_hash.rb
+++ b/activesupport/lib/active_support/ordered_hash.rb
@@ -12,11 +12,25 @@ module ActiveSupport
 
       def self.[](*args)
         ordered_hash = new
-        args.each_with_index { |val,ind|
-          # Only every second value is a key.
-          next if ind % 2 != 0
+
+        if (args.length == 1 && args.first.is_a?(Array))
+          args.first.each do |key_value_pair|
+            next unless (key_value_pair.is_a?(Array))
+            ordered_hash[key_value_pair[0]] = key_value_pair[1]
+          end
+
+          return ordered_hash
+        end
+
+        unless (args.size % 2 == 0)
+          raise ArgumentError.new("odd number of arguments for Hash")
+        end
+
+        args.each_with_index do |val, ind|
+          next if (ind % 2 != 0)
           ordered_hash[val] = args[ind + 1]
-        }
+        end
+
         ordered_hash
       end