无法通过 mongodb 中的过滤器 () 获取数据

Question

I am trying to find the tasks assigned to the user through this

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' })
  }
})

Specifically, this line should have found all the tasks that have an element corresponding to the user ID inside the listP field

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

But this causes an error, why? below is an excerpt from Mango

Answer 1

You can do like this

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' })
  }
})