未定义的方法`each`为nil：NilClass

Question

我有以下代码并收到"undefined method each' for nil:NilClass"

的错误

@loan_ids = params[:moredata].split(",").map { |s| s.to_i }
@loans_ids.each do |number|
  puts number
end

Answer 1

其@loan_ids.each而非@loans_ids.each

Answer 2

@loan_ids=params[:moredata].split(",").map{|s| s.to_i }
@loan_ids.each do |number|
   puts number
end

你拼错了它

Answer 3

@loan_ids.each而不是@loans_ids.each。当没有这样定义时，你有一个复数“贷款”。