Extract ActionDispatch::Request#deep_munge

ActionDispatch::Request#deep_munge was introduced as a private method,
but was turned into a public one for the use of
ActionDispatch::ParamsParser.

I have extracted it into ActionDispatch::Request::Utils, so it does not
get mixed up with the Request public methods.

1 files changed, 24 insertions, 0 deletions

diff --git a/actionpack/lib/action_dispatch/request/utils.rb b/actionpack/lib/action_dispatch/request/utils.rb
new file mode 100644
index 0000000000..8b43cdada8
--- /dev/null
+++ b/actionpack/lib/action_dispatch/request/utils.rb
@@ -0,0 +1,24 @@
+module ActionDispatch
+  class Request < Rack::Request
+    class Utils # :nodoc:
+      class << self
+        # Remove nils from the params hash
+        def deep_munge(hash)
+          hash.each do |k, v|
+            case v
+            when Array
+              v.grep(Hash) { |x| deep_munge(x) }
+              v.compact!
+              hash[k] = nil if v.empty?
+            when Hash
+              deep_munge(v)
+            end
+          end
+
+          hash
+        end
+      end
+    end
+  end
+end
+