Mongoose find 查询返回json数据处理方式

  /**
   * 根据id查询数据模型
   * @param id 数据模型id
   */
  async findById(id: string | string[]) {
    let res
    try {
      if (Array.isArray(id)) {
        res = await this.dataModel.find({ _id: { $in: id } })
      } else {
        res = await this.dataModel.findById(id)
      }
    } catch (error) {
      throw new HttpException(error, HttpStatus.INTERNAL_SERVER_ERROR)
    }
    return res;
  }
 
/**
   * 复制数据模型
   * @param dataModel 数据模型
   */
  async copyDataModal(dataModel: CopyDataModelDto) {
    let res
    try {
      const { id } = dataModel
      const modalData = await this.findById(id)
      if (modalData) {
        modalData.props = (modalData.props || []).map((ele: any) => {
          return dataMasking(ele, ['_id'])
        })
        const addData = dataMasking({ ...modalData, ...dataModel }, ['_id', 'id', '__v'])
        // res = await this.add(addData)
        res=addData
      }
      
 
    } catch (error) {
      throw new HttpException(error, HttpStatus.INTERNAL_SERVER_ERROR)
    }
    return res
  }

return res?res.toObject():res
return res?res.toJSON():res

async findById(id: string | string[]) {
    let res
    try {
      if (Array.isArray(id)) {
        res = await this.dataModel.find({ _id: { $in: id } }).lean().exec()
      } else {
        res = await this.dataModel.findById(id).lean().exec()
      }
    } catch (error) {
      throw new HttpException(error, HttpStatus.INTERNAL_SERVER_ERROR)
    }
    return res
  }