meta_tags_cell.rb

class Frontend::MetaTagsCell < Cell::ViewModel
  include MetaTags::ViewHelper

  def set
    translate = ['seo', controller.controller_name, controller.action_name]
    set_meta_tags %i(title description).map { |m| [m, (I18n.translate!(m, scope: translate) rescue nil)] }.to_h

    alternate = []
    params = request.path_parameters
    params[:locale] = I18n.default_locale

    alternate << {
      href: url_for(params),
      rel: "alternate",
      hreflang: "x-default"
    }

    I18n.available_locales.each do |l|
      params[:locale] = l

      tmp = {}
      tmp[:href] = url_for(params)
      tmp[:rel] = "alternate"

      if I18n.locale == l
        tmp[:rel] = "canonical"
      else
        tmp[:hreflang] = l
      end
      alternate << tmp
    end

    set_meta_tags alternate: alternate



    render
  end

end