A Rails helper for using render_to_string with will_paginate

will_paginate_helper.rb

module WillPaginateHelper
  class StringLinkRenderer < WillPaginate::ActionView::LinkRenderer
    protected

    def url(page)
      @base_url_params ||= begin
        url_params = merge_get_params(default_url_params)
        url_params[:only_path] = true
        merge_optional_params(url_params)
      end

      url_params = @base_url_params.dup
      add_current_page_param(url_params, page)

      if @options[:url_builder]
        @options[:url_builder].call(url_params)
      else
        @template.url_for(url_params)
      end
    end
  end

  def will_paginate_string(collection = nil, options = {}, request = nil)
    params = {
      :host => request[:host],
      :controller => request[:controller],
      :action => request[:action]
    }

    unless request.query_parameters.empty?
      request.query_parameters.each do |k, v|
        params[k] = v
      end
    end

    options.merge!(
      :renderer => WillPaginateHelper::StringLinkRenderer,
      :url_builder => ->(params) { Rails.application.routes.url_for(params) },
      :params => params
    )

    will_paginate(collection, options)
  end
end