reactjs-##NoMethodError （未定义的方法 'reject' 为 0:Integer

我的应用程序使用ruby 3.0和rails 7.0.2。当我尝试运行console或生成controller或迁移时，会出现以下错误：

NoMethodError (undefined method `reject' for 0:Integer Did you mean? rect):

if existing_problem_sets.present? 
  existing_problem_sets.each do |problem_set| 
    problem_set.update!(
      sat_question_id: problem_set.sat_question_id.reject{|x| x==self.id.to_s}, 
      sat_position: problem_set.sat_position.reject{|x| x[:sat_question_id] == self.id.to_s}) 
  end #do
end #if