在Loopback 4中，如何避免更新少数字段

import { repository } from '@loopback/repository';
import { post, param, requestBody } from '@loopback/rest';
import { MyModelRepository } from '../repositories';
import { MyModel } from '../models';

export class MyModelController {
  constructor(
    @repository(MyModelRepository)
    public myModelRepository: MyModelRepository,
  ) {}

  @post('/mymodels/{id}', {
    responses: {
      '204': {
        description: 'MyModel PATCH success',
      },
    },
  })
  async updateById(
    @param.path.number('id') id: number,
    @requestBody({
      content: {
        'application/json': {
          schema: {
            type: 'object',
            properties: {
              field1: { type: 'string' },
              field2: { type: 'number' },
            },
          },
        },
      },
    })
    myModel: Partial<MyModel>,
  ): Promise<void> {
    // 只选择需要更新的字段
    const updatedFields = pick(myModel, ['field1', 'field2']);

    await this.myModelRepository.updateById(id, updatedFields);
  }
}