mongodb中无法通过filter()获取数据

如何解决mongodb中无法通过filter()获取数据

我正在尝试通过此查找分配给用户的任务

router.get('/all',auth,async (req,res) => {
  try {
    const assignments_raw = await Assignment.find({listP: listP.indexOf(req.user.userId)})
    res.json(assignments_raw)
  } catch (e) {
    res.status(500).json({ message: 'Something went wrong,try again' })
  }
})

具体来说，这一行应该已经找到了所有在 listP 字段中具有与用户 ID 对应的元素的任务

 const assignments_raw = await Assignment.find({listP: listP.indexOf(req.user.userId)})

但这会导致错误，为什么？ 下面是摘自芒果

解决方法

你可以这样做

router.get('/all',auth,async (req,res) => {
  try {
    const assignments_raw = await Assignment.find()
    let assignments = []
    assignments_raw.map(assignment => {
          if (assignment.listP.indexOf(req.user.userId) !== -1) {
              assignments.push(assignment)
          }


        }
        )
    res.json(assignments)
  } catch (e) {
    res.status(500).json({ message: 'Something went wrong,try again' })
  }
})