[英]MongoDB findOneAndUpdate projection
I'm currently using MongoDB and using the findOneAndUpdate
method.我目前正在使用 MongoDB 并使用
findOneAndUpdate
方法。 I'm trying to use the projection however it doesn't seem to be working 100% successfully.我正在尝试使用投影,但它似乎没有 100% 成功。
Here is the projection:这是投影:
{
orderID: '$_id',
_id: false,
user: true,
guild: true,
order: true,
status: true,
orderExpiry: true,
priority: true,
sentAt: true
}
As you can see, I'm trying to set orderID
to the value of _id
however, it doesn't do anything.如您所见,我正在尝试将
orderID
设置为_id
的值,但是它没有做任何事情。
Here is the code I am executing for reference :这是我正在执行的代码以供参考:
await this.db.collection('orders').findOneAndUpdate(filter, { $set: { ...data } },
{ returnOriginal: false, projection: this.getProjectionFields() });
I hope someone can help me, thank you!希望有人能帮帮我,谢谢!
As far as I know projection with .find()
or similar .findOneAndUpdate()
does not support field transformations(adding new field out of existing) which $project
in aggregation is capable of doing.据我所知,使用
.find()
或类似的.findOneAndUpdate()
投影不支持聚合中的$project
能够执行的字段转换(从现有字段中添加新字段)。 So projection can be used just to include or exclude certain fields from result.因此,投影可以仅用于在结果中包含或排除某些字段。 Although this is true but up-to certain extent this is false, we can transform an array field using projection operators, Check : projection .
虽然这是真的,但在某种程度上这是错误的,我们可以使用投影运算符 Check : projection转换数组字段。
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