字段, 其类型为 Date。...{ type: String, required: true },
answerer: {
type: Schema.Types.ObjectId,
ref: "User...",
required: true,
select: false
},
questionId: { type: String, required: true },...类型
required: 布尔值或函数,如果为 true,则为此属性添加必须的验证。...answerer: {
type: Schema.Types.ObjectId,
ref: "User",
required: true,
select