class Admin::ResourceController

request parameter > declared by paginate_models > default set in config entry @admin.pagination.per_page@ > overall default of 50
the per_page figure can be set in several ways:
return a hash of page and per_page that can be used to build a will_paginate collection

def pagination_parameters
  pp = params[:pp] || TrustyCms.config['admin.pagination.per_page']
  pp = (self.class.default_per_page || 50) if pp.blank?
  {
    page: (params[:p] || 1).to_i,
    per_page: pp.to_i,
  }
end