javascript - Mongodb 位置运算符不起作用

Question

当我试图更新“标题”时，它工作正常，但如果我试图更新数组中的嵌套对象，它就不起作用。

数据: Data

工作:

const restaurant = await Restaurant.update(
    {_id: '60e6828e4992a2979fa0ba3e'},
    {$set: {title: "Hello}},
  );

不工作:

const restaurant = await Restaurant.update(
    {_id: '60e6828e4992a2979fa0ba3e', 'grades.grade': 85},
    {$set: {'grades.$.grade': 0}},
  );

Answer 1

演示 - https://mongoplayground.net/p/caFBz-lx8dQ

使用$[]

The filtered positional operator $[] identifies the array elements that match the arrayFilters conditions for an update operation

db.collection.update(
 {},
 { $set: { "grades.$[elem].grade": 0 }},
 { arrayFilters: [ {"elem.grade": 85 } ]}
)