如何在填充函数中使用$ elemMatch

Question

嗨，我该如何在填充中使用elemMatch？

picture.findById(pictureId).populate(
{
        path: 'comments',
        $elemMatch: { "likes": user.id },
        populate: {
            path: "user",
            select: ["username", "thumbnail"]
        }
    }
)

我尝试了这个但没用

Answer 1

使用match代替$ elemMatch

https://mongoosejs.com/docs/api.html#query_Query-populate

picture.findById(pictureId).populate(
{
        path: 'comments',
        match: { "likes": user.id },
        populate: {
            path: "user",
            select: ["username", "thumbnail"]
        }
    }
)