add ability to globally disable/enable strong parameters

lib/action_controller/parameters.rb

@@ -1,6 +1,7 @@
 require 'active_support/concern'
 require 'active_support/core_ext/hash/indifferent_access'
 require 'action_controller'
+require 'strong_parameters/config'
 
 module ActionController
   class ParameterMissing < IndexError
@@ -32,7 +33,7 @@ def permit!
     end
 
     def require(key)
-      self[key].presence || raise(ActionController::ParameterMissing.new(key))
+      !::StrongParameters.enabled? || self[key].presence || raise(ActionController::ParameterMissing.new(key))
     end
 
     alias :required :require
@@ -73,7 +74,7 @@ def [](key)
     def fetch(key, *args)
       convert_hashes_to_parameters(key, super)
     rescue KeyError
-      raise ActionController::ParameterMissing.new(key)
+      raise ActionController::ParameterMissing.new(key) if ::StrongParameters.enabled?
     end
 
     def slice(*keys)

lib/active_model/forbidden_attributes_protection.rb

@@ -1,10 +1,12 @@
+require 'strong_parameters/config'
+
 module ActiveModel
   class ForbiddenAttributes < StandardError
   end
 
   module ForbiddenAttributesProtection
     def sanitize_for_mass_assignment(new_attributes, options = {})
-      if !new_attributes.respond_to?(:permitted?) || new_attributes.permitted?
+      if ::StrongParameters.enabled? && (!new_attributes.respond_to?(:permitted?) || new_attributes.permitted?)
         super
       else
         raise ActiveModel::ForbiddenAttributes

lib/strong_parameters.rb

@@ -1,3 +1,4 @@
 require 'action_controller/parameters'
 require 'active_model/forbidden_attributes_protection'
 require 'strong_parameters/railtie'
+require 'strong_parameters/config'

lib/strong_parameters/config.rb

@@ -0,0 +1,8 @@
+module StrongParameters
+  class << self
+    attr_accessor :enabled
+    def enabled?;!!enabled;end
+  end
+end
+
+StrongParameters.enabled = true

test/disabling_test.rb

@@ -0,0 +1,17 @@
+require 'test_helper'
+require 'action_controller/parameters'
+
+class DisablingTest < ActiveSupport::TestCase
+  test "should be able to disable and re-enable strong_parameters" do
+    # assume is enabled by default
+    assert_raises(ActionController::ParameterMissing) do
+      ActionController::Parameters.new(person: {}).require(:person)
+    end
+    StrongParameters.enabled = false
+    ActionController::Parameters.new(person: {}).require(:person)
+    StrongParameters.enabled = true
+    assert_raises(ActionController::ParameterMissing) do
+      ActionController::Parameters.new(person: {}).require(:person)
+    end
+  end
+end