Old version of Algolia's Ruby Client delete_by_query method

old_algolia_delete_by_query.rb

#
# Delete all objects matching a query
#
# @param query the query string
# @param params the optional query parameters
#
def delete_by_query(query, params = nil)
  raise ArgumentError.new('query cannot be nil, use the `clear` method to wipe the entire index') if query.nil? && params.nil?
  params ||= {}
  params.delete(:hitsPerPage)
  params.delete('hitsPerPage')
  params.delete(:attributesToRetrieve)
  params.delete('attributesToRetrieve')

  params[:hitsPerPage] = 1000
  params[:attributesToRetrieve] = ['objectID']
  loop do
    res = search(query, params)
    break if res['hits'].empty?
    res = delete_objects(res['hits'].map { |h| h['objectID'] })
    wait_task res['taskID']
  end
end