javascript - deleteMany 显示 0 已删除但实际上删除了文档

Question

此 Controller 正在删除特定用户的所有待办事项，但作为响应显示 {n: 0, deletedCount: 0, ok: 1}，有人知道解决方案吗？

exports.deleteAll = async (req, res) => {

    const { id } = req.user

    console.log('id', id);

    try {
        // const deleteAllTodos = await TodoModel.findByIdAndDelete(id)

        const deleteAllTodos = await TodoModel.deleteMany({ createdBy: id}, function (err) { 

        console.log('err', err) })

        res.send({ success: true, message: "All todos deleted successfully", deleteAllTodos })

    } catch (error) {

        console.log('Error:', error.message);

        res.status(500).json({
            message: "Internal server error",
            success: false,
            error: error.message
        });

    }
}

Answer 1

来自 Mongoose Query guides

Don't mix using callbacks and promises with queries, or you may end upwith duplicate operations. That's because passing a callback to aquery function immediately executes the query, and calling then()executes the query again.

所以您在那里所做的是调用 deleteMany 两次，首先使用回调，然后使用 async/await。第二次尝试将尝试删除任何内容，因为第一次尝试已经删除了它们。

您可以尝试使用其中之一:

...
const deleteAllTodos = await TodoModel.deleteMany({ createdBy: id }).exec();
res.send({ 
    success: true, 
    message: "All todos deleted successfully", 
    deleteAllTodos 
})

不要担心使用回调的错误处理，因为您已经使用 try/catch block 完成了它，如果在 deleteMany 上发生任何错误，它将捕获。