[Rails3からRails5へ移行]StrongParamの設定について

Question

Rails3からRails5へアップデートの作業を行っています。
その際にストロングパラメータが有効になった影響でエラーが出てしまい、ネットで調べた解決方法ではエラーを治せなくこちらでご質問させてください。

Rails3でcreateメソッド登録する際に以下の実装にしていますが

def create
    @library = Library.new(params[:library])
    @library.translations = params[:library_translations]

    respond_to do |format|
      if @library.save
        format.html { redirect_to(admin_library_url(@library), :notice => t('controller.successfully_created', :model => t('activerecord.models.library'))) }
      else
        format.html { render :action => "new" }
      end
    end
  end

Rails5からマスアサインメントが有効になっているため以下のように修正しています。
(パラメータの指定の前に動作確認がしたいのでpermit!して全許可しようとしてます)

def create
    param.permit!
    @library = Library.new(params[:library])
    @library.translations = params[:library_translations]

    respond_to do |format|
      if @library.save
        format.html { redirect_to(admin_library_url(@library), :notice => t('controller.successfully_created', :model => t('activerecord.models.library'))) }
      else
        format.html { render :action => "new" }
      end
    end
  end

上記でpermitはスルー出来ると考えていたのですが、createにsubmitすると以下のようにエラーが出ます。

ActiveModel::ForbiddenAttributesError in Admin::LibrariesController#create
ActiveModel::ForbiddenAttributesError
Extracted source (around line #23):
21  def sanitize_for_mass_assignment(attributes)
22    if attributes.respond_to?(:permitted?)
23      raise ActiveModel::ForbiddenAttributesError if !attributes.permitted?
24      attributes.to_h
25    else
26      attributes

Application Trace | Framework Trace | Full Trace
vendor/bundle/ruby/2.6.0/gems/activemodel-5.2.0/lib/active_model/forbidden_attributes_protection.rb:23:in `sanitize_for_mass_assignment'
vendor/bundle/ruby/2.6.0/gems/activemodel-5.2.0/lib/active_model/attribute_assignment.rb:35:in `assign_attributes'
vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.0/lib/active_record/core.rb:314:in `initialize'
vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.0/lib/active_record/inheritance.rb:66:in `new'
vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.0/lib/active_record/inheritance.rb:66:in `new'
vendor/bundle/ruby/2.6.0/gems/cancancan-3.0.1/lib/cancan/controller_resource_builder.rb:8:in `build_resource'
vendor/bundle/ruby/2.6.0/gems/cancancan-3.0.1/lib/cancan/controller_resource_loader.rb:108:in `load_resource_instance'
vendor/bundle/ruby/2.6.0/gems/cancancan-3.0.1/lib/cancan/controller_resource_loader.rb:18:in `load_resource'
vendor/bundle/ruby/2.6.0/gems/cancancan-3.0.1/lib/cancan/controller_resource.rb:33:in `load_and_authorize_resource'
vendor/bundle/ruby/2.6.0/gems/cancancan-3.0.1/lib/cancan/controller_resource.rb:17:in `block in add_before_action'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:426:in `instance_exec'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:426:in `block in make_lambda'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:198:in `block (2 levels) in halting'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/abstract_controller/callbacks.rb:34:in `block (2 levels) in <module:Callbacks>'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:199:in `block in halting'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:513:in `block in invoke_before'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:513:in `each'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:513:in `invoke_before'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:131:in `run_callbacks'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/abstract_controller/callbacks.rb:41:in `process_action'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_controller/metal/rescue.rb:22:in `process_action'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_controller/metal/instrumentation.rb:34:in `block in process_action'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/notifications.rb:168:in `block in instrument'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/notifications/instrumenter.rb:23:in `instrument'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/notifications.rb:168:in `instrument'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_controller/metal/instrumentation.rb:32:in `process_action'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_controller/metal/params_wrapper.rb:256:in `process_action'
vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.0/lib/active_record/railties/controller_runtime.rb:24:in `process_action'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/abstract_controller/base.rb:134:in `process'
vendor/bundle/ruby/2.6.0/gems/actionview-5.2.0/lib/action_view/rendering.rb:32:in `process'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_controller/metal.rb:191:in `dispatch'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_controller/metal.rb:252:in `dispatch'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/routing/route_set.rb:52:in `dispatch'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/routing/route_set.rb:34:in `serve'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/journey/router.rb:52:in `block in serve'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/journey/router.rb:35:in `each'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/journey/router.rb:35:in `serve'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/routing/route_set.rb:840:in `call'
vendor/bundle/ruby/2.6.0/gems/warden-1.2.8/lib/warden/manager.rb:36:in `block in call'
vendor/bundle/ruby/2.6.0/gems/warden-1.2.8/lib/warden/manager.rb:34:in `catch'
vendor/bundle/ruby/2.6.0/gems/warden-1.2.8/lib/warden/manager.rb:34:in `call'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/tempfile_reaper.rb:15:in `call'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/etag.rb:25:in `call'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/conditional_get.rb:38:in `call'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/head.rb:12:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/http/content_security_policy.rb:18:in `call'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/session/abstract/id.rb:232:in `context'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/session/abstract/id.rb:226:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/cookies.rb:670:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:98:in `run_callbacks'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/executor.rb:14:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/debug_exceptions.rb:61:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
vendor/bundle/ruby/2.6.0/gems/railties-5.2.0/lib/rails/rack/logger.rb:38:in `call_app'
vendor/bundle/ruby/2.6.0/gems/railties-5.2.0/lib/rails/rack/logger.rb:26:in `block in call'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/tagged_logging.rb:71:in `block in tagged'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/tagged_logging.rb:28:in `tagged'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/tagged_logging.rb:71:in `tagged'
vendor/bundle/ruby/2.6.0/gems/railties-5.2.0/lib/rails/rack/logger.rb:26:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
vendor/bundle/ruby/2.6.0/gems/request_store-1.4.1/lib/request_store/middleware.rb:19:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/request_id.rb:27:in `call'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/method_override.rb:22:in `call'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/runtime.rb:22:in `call'
vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.0/lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/executor.rb:14:in `call'
vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.0/lib/action_dispatch/middleware/static.rb:127:in `call'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/sendfile.rb:111:in `call'
vendor/bundle/ruby/2.6.0/gems/railties-5.2.0/lib/rails/engine.rb:524:in `call'
vendor/bundle/ruby/2.6.0/gems/rack-2.0.7/lib/rack/handler/webrick.rb:86:in `service'
/usr/local/rbenv/versions/2.6.5/lib/ruby/2.6.0/webrick/httpserver.rb:140:in `service'
/usr/local/rbenv/versions/2.6.5/lib/ruby/2.6.0/webrick/httpserver.rb:96:in `run'
/usr/local/rbenv/versions/2.6.5/lib/ruby/2.6.0/webrick/server.rb:307:in `block in start_thread'

この場合createアクションにpermit!は間違っていますでしょうか？
解決策がわからず途方に暮れています。
ご教示いただけますと大変幸いです。

Answer 1

cancanを導入している環境だったため、パラメータのpermitは明示的に行わなければいけないようでした。
privateメソッドにコールバックメソッドを定義して明示的にpermitすることで解決できました。
https://github.com/CanCanCommunity/cancancan#33-strong-parameters

Answer 2

param.permit!
params.permit!