selective_searchable.rb

# A naive approach to implement a picky search
module SelectiveSearchable

  def searchable_on(*attrs)
    search_attrs = attrs.map { |attr| "#{attr}_cont".to_sym }
    define_singleton_method(:picky_search) do |query, page = 0, limit = 10|
      if query.try(:empty?)
        sentence = Proc.new { self.all }
      else
        q = search_attrs.reduce({}) {|dict, attr| dict.merge({attr => query}) }
        sentence = Proc.new { self.ransack(q).result(distinct: true) }
      end
      sentence.call.page(page).per(limit)
    end

  end

end