猫鼬中的虚拟填充不起作用？

Question

即使我已在我的模式中激活toJSON和toObject {virtuals：true}属性，我的虚拟填充区仍遇到问题。

我有一个这样的旅行模型，我想要所有评论

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']
      // validate: [validator.isAlpha, 'Tour name must only contain characters']
    },
    slug: String,
    duration: {
      type: Number,
      required: [true, 'A tour must have a duration']
    },
    maxGroupSize: {
      type: Number,
      required: [true, 'A tour must have a group size']
    },
    difficulty: {
      type: String,
      required: [true, 'A tour must have a difficulty'],
      enum: {
        values: ['easy', 'medium', 'difficult'],
        message: 'Difficulty is either: easy, medium, difficult'
      }
    },
    ratingsAverage: {
      type: Number,
      default: 4.5,
      min: [1, 'Rating must be above 1.0'],
      max: [5, 'Rating must be below 5.0'],
      set: val => Math.round(val * 10) / 10 // 4.666666, 46.6666, 47, 4.7
    },
    ratingsQuantity: {
      type: Number,
      default: 0
    },
    price: {
      type: Number,
      required: [true, 'A tour must have a price']
    },
    guides: [
      {
        type: mongoose.Schema.ObjectId,
        ref: 'User'
      }
    ]
  }
  // ,
  // {
  //   toJSON: { virtuals: true },
  //   toObject: { virtuals: true }
  // }
);
tourSchema.set('toObject', { virtuals: true });
tourSchema.set('toJSON', { virtuals: true });

// Virtual Populate
tourSchema.virtual('reviews', {
  ref: 'Review',
  foreignField: 'tour',
  localField: '_id'
});

const Tour = mongoose.model('Tour', tourSchema);

module.exports = Tour;

这是reviewsModel

const reviewsSchema = new mongoose.Schema(
  {
    review: {
      type: String,
      required: [true, 'Review cannot be empty !']
    },
    rating: {
      type: Number,
      min: 1,
      max: 5
    },
    createdAt: {
      type: Date,
      default: Date.now
    },
    tour: {
      type: mongoose.Schema.ObjectId,
      ref: 'Tour',
      required: [true, 'A Review must belong to a tour !']
    },
    user: {
      type: mongoose.Schema.ObjectId,
      ref: 'User',
      required: [true, 'A Review must belong to a User !']
    }
  },
  {
    toJSON: { virtuals: true },
    toObject: { virtuals: true }
  }
);

const Review = mongoose.model('Review', reviewsSchema);

plz帮我，我已经在stackOverflow上观看了有关此问题的所有问题，但他们都说添加到JSON和toObject，一切都会好起来的。但是我的项目仍然不行...