From 96070595697477676ea051c19c2c951901302bed Mon Sep 17 00:00:00 2001 From: Tim Rogers Date: Fri, 8 Jul 2016 17:48:21 +0100 Subject: Trust `Object#dup` in `ActionController::Parameters`, using `#initialize_copy` to manually duplicate the underlying parameters hash It looks like `ActionController::Parameters#dup` is leftover from when the class inherited from `Hash`. We can just trust `#dup`, which already copies the `@permitted` instance variable (confirmed by tests). We still define a `#initialize_copy` to make `@parameters` a copy that can be mutated without affecting the original instance. --- .../lib/action_controller/metal/strong_parameters.rb | 16 +--------------- actionpack/test/controller/parameters/dup_test.rb | 20 +++++++++++++++++++- 2 files changed, 20 insertions(+), 16 deletions(-) diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb index fea04d98e0..26794c67b7 100644 --- a/actionpack/lib/action_controller/metal/strong_parameters.rb +++ b/actionpack/lib/action_controller/metal/strong_parameters.rb @@ -572,20 +572,6 @@ module ActionController convert_value_to_parameters(@parameters.values_at(*keys)) end - # Returns an exact copy of the ActionController::Parameters - # instance. +permitted+ state is kept on the duped object. - # - # params = ActionController::Parameters.new(a: 1) - # params.permit! - # params.permitted? # => true - # copy_params = params.dup # => 1} permitted: true> - # copy_params.permitted? # => true - def dup - super.tap do |duplicate| - duplicate.permitted = @permitted - end - end - # Returns a new ActionController::Parameters with all keys from # +other_hash+ merges into current hash. def merge(other_hash) @@ -786,7 +772,7 @@ module ActionController def initialize_copy(source) super - @parameters = source.instance_variable_get(:@parameters).dup + @parameters = @parameters.dup end end diff --git a/actionpack/test/controller/parameters/dup_test.rb b/actionpack/test/controller/parameters/dup_test.rb index cf273933bd..ac5a9d94d0 100644 --- a/actionpack/test/controller/parameters/dup_test.rb +++ b/actionpack/test/controller/parameters/dup_test.rb @@ -17,9 +17,27 @@ class ParametersDupTest < ActiveSupport::TestCase ) end - test "changes on a duplicate do not affect the original" do + test "a duplicate maintains the original's permitted status" do + @params.permit! + dupped_params = @params.dup + assert dupped_params.permitted? + end + + test "a duplicate maintains the original's parameters" do + @params.permit! + dupped_params = @params.dup + assert_equal @params.to_h, dupped_params.to_h + end + + test "changes to a duplicate's parameters do not affect the original" do dupped_params = @params.dup dupped_params.delete(:person) assert_not_equal @params, dupped_params end + + test "changes tp a duplicate's permitted status do not affect the original" do + dupped_params = @params.dup + dupped_params.permit! + assert_not_equal @params, dupped_params + end end -- cgit v1.2.3