You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: guide_search.rb
    path of file: ./repos/OpenFarm/app/models
    
    the code of the file until where you have to start completion: class GuideSearch
  attr_reader :filter
  attr_reader :order
  attr_reader :query

  def initialize
    @filter = {}
 
    
  def for_crops(crops)
    filter[:crop_id] = Array(crops).map do |crop|
      crop.respond_to?(:id) ? crop.id : crop
    end

    self
  end