1 files changed, 3 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/to_param.rb b/activesupport/lib/active_support/core_ext/object/to_param.rb
index f2e7c2351e..3a18e2a121 100644
--- a/activesupport/lib/active_support/core_ext/object/to_param.rb
+++ b/activesupport/lib/active_support/core_ext/object/to_param.rb
@@ -35,7 +35,8 @@ end
 
 class Hash
   # Converts a hash into a string suitable for use as a URL query string. An optional <tt>namespace</tt> can be
-  # passed to enclose the param names (see example below).
+  # passed to enclose the param names (see example below). The keys in the query string are sorted lexicographically
+  # in ascending order.
   #
   # ==== Examples
   #   { :name => 'David', :nationality => 'Danish' }.to_param # => "name=David&nationality=Danish"
@@ -44,6 +45,6 @@ class Hash
   def to_param(namespace = nil)
     collect do |key, value|
       value.to_query(namespace ? "#{namespace}[#{key}]" : key)
-    end * '&'
+    end.sort * '&'
   end
 end