Node.js Mongoose从数组中删除子文档

权重模式：

const userSchema = new Schema({
    googleId: String,
    weights: [Weight]
});

您可以使用以下功能执行此操作：

const weightSchema = new Schema({
    date: String,
    weight: Number
});

可能重复的

const weightSchema = new Schema({
    date: String,
    weight: Number
});

  // Get the user from database
  const user = await User.findById(req.user._id);

  // Use the function filter to remove every user
  // matching the date in weightInstance
  user.weights = user.weights.filter(x => x.date !== weightInstance.date);

  // Save the modified user
  await user.save();