Fix Datatables

Using `def_delegator` needs Forwardable

app/controllers/admin/registrations_controller.rb

@@ -20,7 +20,7 @@ module Admin
       respond_to do |format|
         format.html
         format.json do
-          render json: RegistrationDatatable.new(view_context, conference: @conference)
+          render json: RegistrationDatatable.new(view_context: view_context, conference: @conference)
         end
         format.pdf { render 'index', layout: false }
         format.xlsx do

app/controllers/admin/users_controller.rb

@@ -23,7 +23,7 @@ module Admin
       respond_to do |format|
         format.html
         format.json do
-          render json: UserDatatable.new(view_context)
+          render json: UserDatatable.new(view_context: view_context)
         end
       end
     end

app/datatables/registration_datatable.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class RegistrationDatatable < AjaxDatatablesRails::Base
+  extend Forwardable
+
   def_delegator :@view, :edit_admin_conference_registration_path
 
   def view_columns

app/datatables/user_datatable.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class UserDatatable < AjaxDatatablesRails::Base
+  extend Forwardable
+
   def_delegator :@view, :show_roles
   def_delegator :@view, :admin_user_path
   def_delegator :@view, :edit_admin_user_path