Mongoose 편의 기능 정리
아래에서 사용할 Tour 스키마 예시 const tourSchema = new mongoose.Schema( { name: { type: String, required: [true, 'A tour must have a name'], unique: true, trim: true, maxlength: [40, 'A tour name must have less or equal then 40 characters'], minlength: [10, 'A tour name must have more or equal then 10 characters'], }, slug: String, duration: { type: Number, required: [true, 'A t..