arrays - 从 JSON 数组中的每个元素中删除一个键 - Ruby

Question

所以，我有一个 JSON 数组，我通过它循环并添加三个键及其值，我还想从数组中的每个元素中删除/删除一个键(subject_id)。

如何着手做这件事？

s=JSON.parse(subjects.to_json)
s.each do |j|
  j["total_classes"] = total_classes[i]
  j["attended_classes"] = attended_classes[i]
  j["subject_name"] = subject_name[i]
  j["subject_id"] #remove this key, how?
  i=i+1
end

render json: { attendances: s }

Answer 1

试试这个

j.delete("subject_id")