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-rw-r--r--actionpack/lib/action_controller/metal/strong_parameters.rb19
1 files changed, 19 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb
index 26794c67b7..98624ba103 100644
--- a/actionpack/lib/action_controller/metal/strong_parameters.rb
+++ b/actionpack/lib/action_controller/metal/strong_parameters.rb
@@ -7,6 +7,12 @@ require 'action_dispatch/http/upload'
require 'rack/test'
require 'stringio'
require 'set'
+require 'yaml'
+
+# Wire up YAML format compatibility with Rails 4.2. Makes the YAML parser call
+# `init_with` when it encounters `!ruby/hash-with-ivars:ActionController::Parameters`,
+# instead of trying to parse it as a regular hash subclass.
+YAML.load_tags['!ruby/hash-with-ivars:ActionController::Parameters'] = 'ActionController::Parameters'
module ActionController
# Raised when a required parameter is missing.
@@ -591,6 +597,19 @@ module ActionController
"<#{self.class} #{@parameters} permitted: #{@permitted}>"
end
+ def init_with(coder) # :nodoc:
+ if coder.map['elements']
+ # YAML's Hash subclass format from Rails 4.2, where keys and values
+ # were stored under an elements hash and `permitted` within an ivars hash.
+ @parameters = coder.map['elements'].with_indifferent_access
+ @permitted = coder.map['ivars'][:@permitted]
+ else
+ # YAML's Object format. Only needed because of the format
+ # backwardscompability above, otherwise equivalent to YAML's initialization.
+ @parameters, @permitted = coder.map['parameters'], coder.map['permitted']
+ end
+ end
+
def method_missing(method_sym, *args, &block)
if @parameters.respond_to?(method_sym)
message = <<-DEPRECATE.squish