如何在mongoose模式中包含灵活的对象？

const mongoose = require('mongoose');

const flexibleObjectSchema = new mongoose.Schema({
  name: String,
  data: mongoose.Schema.Types.Mixed
});

const FlexibleObject = mongoose.model('FlexibleObject', flexibleObjectSchema);

const flexibleDoc = new FlexibleObject({
  name: 'Flexible Document',
  data: {
    key1: 'value1',
    key2: 123,
    key3: ['item1', 'item2'],
    key4: {
      nestedKey: 'nestedValue'
    }
  }
});

flexibleDoc.save()
  .then(() => {
    console.log('Flexible document saved successfully');
  })
  .catch((error) => {
    console.error('Error saving flexible document:', error);
  });