Sunspot rails search, deny creating facets by condition

Question

I use sunspot_rails gem in full text searching in Ruby on Rails,
I added boolean field ('show_facet') to my model Product, and to solr index
Then I want to do next:

• if 'show_facet' == true then show Product in search list and facets list
• if 'show_facet' == false then show Product only in search list

I read all docs, forums and api but I can't find answer to this question
Could I do this with sunspot?

Model Code
searchable do
    string  :keywords, multiple: true    
    string  :status
    boolean :show
    boolean :show_facet
    time    :updated_at
    text    :keyword_long, stored: true
    text    :jtitle, stored: true
    integer :id
    integer :company_id
  end


Controller

  def show
    @product_search = OpenStruct.new(params[:product_search])
    @search = search_plain
  end

  private

  def search_plain
    basic_search do |search|
      search.fulltext(@product_search.fulltext) do
        fields *(%w[jtitle keyword_long])
        highlight :keyword_long
        highlight :jtitle
      end
    end
  end

  def basic_search
    Product.solr_search do |search|
      yield search
      search.with(:show, true)
      search.order_by(:random)
      search.paginate page: params[:page], per_page: 10
      search.with(:keywords).all_of(@product_search.keywords)
      search.facet :keywords
    end
  end

I need include in facet(:keywords) only facets from product with show_facet = true, but show all products in search (with show_facet true or false)