node.js - 更新引用文档数组时 mongoose 中的 DivergentArrayError

Question

我在 mongoose 中定义了一个模式，如下所示:

var VolunteerSchema = new Schema ({
......
other fields
.....
preferLocations:[{
        type: Schema.ObjectId,
        ref: 'Location'
    }]
.....
});

我正在使用 volunteer.save() 方法来更新模型。

更新到 volunteer 模型时，出现如下错误:

{ [DivergentArrayError: For your own good, using `document.save()` to update an
array which was selected using an $elemMatch projection OR populated using skip,
 limit, query conditions, or exclusion of the _id field when the operation resul
ts in a $pop or $set of the entire array is not supported. The following path(s)
 would have been modified unsafely:
  preferLocations
Use Model.update() to update these arrays instead.]
  message: 'For your own good, using `document.save()` to update an array which
was selected using an $elemMatch projection OR populated using skip, limit, quer
y conditions, or exclusion of the _id field when the operation results in a $pop
 or $set of the entire array is not supported. The following path(s) would have
been modified unsafely:\n  preferLocations\nUse Model.update() to update these a
rrays instead.',
  name: 'DivergentArrayError' }

在更新位置时，我收集数组中的 _ids 字段并分配给 preferLocations，如下所示:

volunteer.preferLocations = locationIdsArray;

删除此行时我没有收到错误。我做错了什么？

Answer 1

在投影中使用 $elemMatch 时，请勿使用 document.save()。相反，使用 Model.update() 手动更新您的文档。在你的情况下，你应该尝试

 volunteer.findOneAndUpdate(
  {
    _id: ObjectId("567452bae5b25d6e6c1a0f7e"),
    localization: { '$elemMatch': { language: 'de' } }
  },
  {
    $set: { 'localization.$.name' : "Neuer Name" }
  }).exec(//...
});

click这里有更多细节