1 files changed, 9 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/array/conversions.rb b/activesupport/lib/active_support/core_ext/array/conversions.rb
index b7d4434e85..c828e84112 100644
--- a/activesupport/lib/active_support/core_ext/array/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/array/conversions.rb
@@ -29,6 +29,15 @@ module ActiveSupport #:nodoc:
           join '/'
         end
 
+        # Converts an array into a string suitable for use as a URL query string, using the given <tt>key</tt> as the
+        # param name.
+        #
+        # ==== Example:
+        #   ['Rails', 'coding'].to_query('hobbies') => "hobbies%5B%5D=Rails&hobbies%5B%5D=coding"
+        def to_query(key)
+          collect { |value| value.to_query("#{key}[]") } * '&'
+        end
+
         def self.included(base) #:nodoc:
           base.class_eval do
             alias_method :to_default_s, :to_s