Revert "unpermitted params" exception -- it's just not going to work. See the...

Revert "unpermitted params" exception -- it's just not going to work. See the discussion on https://github.com/rails/strong_parameters/pull/75.

actionpack/lib/action_controller/metal/strong_parameters.rb

@@ -19,20 +19,6 @@ def initialize(param) # :nodoc:
     end
   end
 
-  # Raised when a supplied parameter is not permitted.
-  #
-  #   params = ActionController::Parameters.new(a: "123", b: "456")
-  #   params.permit(:c)
-  #   # => ActionController::UnpermittedParameters: found unpermitted keys: a, b
-  class UnpermittedParameters < IndexError
-    attr_reader :params # :nodoc:
-
-    def initialize(params) # :nodoc:
-      @params = params
-      super("found unpermitted keys: #{params.join(", ")}")
-    end
-  end
-
   # == Action Controller \Parameters
   #
   # Allows to choose which attributes should be whitelisted for mass updating
@@ -57,14 +43,10 @@ def initialize(params) # :nodoc:
   #   Person.first.update!(permitted)
   #   # => #<Person id: 1, name: "Francesco", age: 22, role: "user">
   #
-  # It provides two options that controls the top-level behavior of new instances:
-  #
-  # * +permit_all_parameters+ - If it's +true+, all the parameters will be
-  #   permitted by default. The default is +false+.
-  # * +raise_on_unpermitted_parameters+ - If it's +true+, it will raise an
-  #   ActionController::UnpermittedParameters exception if parameters that are not
-  #   explicitly permitted are found. The default value is +true+ in test and
-  #   development environments, +false+ otherwise.
+  # It provides a +permit_all_parameters+ option that controls the top-level
+  # behaviour of new instances. If it's +true+, all the parameters will be
+  # permitted by default. The default value for +permit_all_parameters+
+  # option is +false+.
   #
   #   params = ActionController::Parameters.new
   #   params.permitted? # => false
@@ -74,16 +56,6 @@ def initialize(params) # :nodoc:
   #   params = ActionController::Parameters.new
   #   params.permitted? # => true
   #
-  #   params = ActionController::Parameters.new(a: "123", b: "456")
-  #   params.permit(:c)
-  #   # => {}
-  #
-  #   ActionController::Parameters.raise_on_unpermitted_parameters = true
-  #
-  #   params = ActionController::Parameters.new(a: "123", b: "456")
-  #   params.permit(:c)
-  #   # => ActionController::UnpermittedParameters: found unpermitted keys: a, b
-  #
   # <tt>ActionController::Parameters</tt> is inherited from
   # <tt>ActiveSupport::HashWithIndifferentAccess</tt>, this means
   # that you can fetch values using either <tt>:key</tt> or <tt>"key"</tt>.
@@ -93,11 +65,6 @@ def initialize(params) # :nodoc:
   #   params["key"] # => "value"
   class Parameters < ActiveSupport::HashWithIndifferentAccess
     cattr_accessor :permit_all_parameters, instance_accessor: false
-    cattr_accessor :raise_on_unpermitted_parameters, instance_accessor: false
-
-    # Never raise an UnpermittedParameters exception because of these params
-    # are present. They are added by Rails and it's of no concern.
-    NEVER_UNPERMITTED_PARAMS = %w( controller action )
 
     # Returns a new instance of <tt>ActionController::Parameters</tt>.
     # Also, sets the +permitted+ attribute to the default value of
@@ -255,8 +222,6 @@ def permit(*filters)
         end
       end
 
-      raise_on_unpermitted_parameters!(params)
-
       params.permit!
     end
 
@@ -335,16 +300,6 @@ def each_element(object)
           yield object
         end
       end
-      
-      def raise_on_unpermitted_parameters!(params)
-        if self.class.raise_on_unpermitted_parameters && unpermitted_keys(params).any?
-          raise ActionController::UnpermittedParameters.new(unpermitted_keys(params))
-        end
-      end
-      
-      def unpermitted_keys(params)
-        self.keys - params.keys - NEVER_UNPERMITTED_PARAMS
-      end
   end
 
   # == Strong \Parameters

actionpack/lib/action_controller/railtie.rb

@@ -20,25 +20,22 @@ class Railtie < Rails::Railtie #:nodoc:
     end
 
     initializer "action_controller.parameters_config" do |app|
-      options = app.config.action_controller
-
-      ActionController::Parameters.permit_all_parameters = options.delete(:permit_all_parameters) { false }
-      ActionController::Parameters.raise_on_unpermitted_parameters = options.delete(:raise_on_unpermitted_parameters) { Rails.env.test? || Rails.env.development? }
+      ActionController::Parameters.permit_all_parameters = app.config.action_controller.delete(:permit_all_parameters) { false }
     end
 
     initializer "action_controller.set_configs" do |app|
       paths   = app.config.paths
       options = app.config.action_controller
 
-      options.logger            ||= Rails.logger
-      options.cache_store       ||= Rails.cache
+      options.logger               ||= Rails.logger
+      options.cache_store          ||= Rails.cache
 
-      options.javascripts_dir   ||= paths["public/javascripts"].first
-      options.stylesheets_dir   ||= paths["public/stylesheets"].first
+      options.javascripts_dir      ||= paths["public/javascripts"].first
+      options.stylesheets_dir      ||= paths["public/stylesheets"].first
 
       # Ensure readers methods get compiled
-      options.asset_host        ||= app.config.asset_host
-      options.relative_url_root ||= app.config.relative_url_root
+      options.asset_host           ||= app.config.asset_host
+      options.relative_url_root    ||= app.config.relative_url_root
 
       ActiveSupport.on_load(:action_controller) do
         include app.routes.mounted_helpers

actionpack/test/controller/parameters/raise_on_unpermitted_parameters_test.rb

-require 'abstract_unit'
-require 'action_controller/metal/strong_parameters'
-
-class RaiseOnUnpermittedParametersTest < ActiveSupport::TestCase
-  def setup
-    ActionController::Parameters.raise_on_unpermitted_parameters = true
-  end
-
-  def teardown
-    ActionController::Parameters.raise_on_unpermitted_parameters = false
-  end
-
-  test "raises on unexpected params" do
-    params = ActionController::Parameters.new({
-      book: { pages: 65 },
-      fishing: "Turnips"
-    })
-
-    assert_raises(ActionController::UnpermittedParameters) do
-      params.permit(book: [:pages])
-    end
-  end
-
-  test "raises on unexpected nested params" do
-    params = ActionController::Parameters.new({
-      book: { pages: 65, title: "Green Cats and where to find then." }
-    })
-
-    assert_raises(ActionController::UnpermittedParameters) do
-      params.permit(book: [:pages])
-    end
-  end
-  
-  test "action and controller keys are safe to ignore" do
-    params = ActionController::Parameters.new({
-      action: 'index', controller: 'stuff', book: { pages: 65 }
-    })
-
-    assert_nothing_raised do
-      params.permit(book: [:pages])
-    end
-  end
-end

railties/test/application/configuration_test.rb

@@ -577,54 +577,6 @@ def create
       assert_equal 'permitted', last_response.body
     end
 
-    test "config.action_controller.raise_on_unpermitted_parameters = true" do
-      app_file 'app/controllers/posts_controller.rb', <<-RUBY
-      class PostsController < ActionController::Base
-        def create
-          render text: params.require(:post).permit(:name)
-        end
-      end
-      RUBY
-
-      add_to_config <<-RUBY
-        routes.prepend do
-          resources :posts
-        end
-        config.action_controller.raise_on_unpermitted_parameters = true
-      RUBY
-
-      require "#{app_path}/config/environment"
-
-      assert_equal true, ActionController::Parameters.raise_on_unpermitted_parameters
-
-      post "/posts", {post: {"title" =>"zomg"}}
-      assert_match "We're sorry, but something went wrong", last_response.body
-    end
-
-    test "config.action_controller.raise_on_unpermitted_parameters is true by default on development" do
-      ENV["RAILS_ENV"] = "development"
-
-      require "#{app_path}/config/environment"
-
-      assert_equal true, ActionController::Parameters.raise_on_unpermitted_parameters
-    end
-
-    test "config.action_controller.raise_on_unpermitted_parameters is true by defaul on test" do
-      ENV["RAILS_ENV"] = "test"
-
-      require "#{app_path}/config/environment"
-
-      assert_equal true, ActionController::Parameters.raise_on_unpermitted_parameters
-    end
-
-    test "config.action_controller.raise_on_unpermitted_parameters is false by default on production" do
-      ENV["RAILS_ENV"] = "production"
-
-      require "#{app_path}/config/environment"
-
-      assert_equal false, ActionController::Parameters.raise_on_unpermitted_parameters
-    end
-
     test "config.action_dispatch.ignore_accept_header" do
       make_basic_app do |app|
         app.config.action_dispatch.ignore_accept_header = true