I am using typegoose and type-graphql.
I have a CommentModel which has a parentId field that stores ObjectId of its parent comment.
What do I want?
I want to automate deletion of parents by using pre middleware. means when I delete a comment, I want it to delete all the comments that their parentId equals to targeted comment id.
An example:
So, when I delete comment 2, I expect the comment 1 will be deleted too.
comment: [
{
_id: 1,
parentId: 2
},
{
_id: 2,
parentId: null
}
]
but I can't.
What did I do?
this is my middleware:
@pre(/remove|delete/i, async function () {
await CommentModel.deleteMany({ parentId: this._id })
})
export class Comment {
...
}
export const CommentModel = getModelForClass(Comment)
And this is how I delete
await CommentModel.findByIdAndDelete(ID_OF_COMMENT)
this operation will NEVER finish. and always show me the loading spinner. What do you suggest? Am I doing it wrong? or there is a better approach?
every middelware have a next funxtion to continue change it like this:
@pre(/remove|delete/i, async function (next) {
await CommentModel.deleteMany({ parentId: this._id })
next();
})
This is how I fixed it:
@post(/remove|delete/i, async function (comment: DocumentType<Comment> | null) {
if (comment?._id) {
const children = await CommentModel.find({ parentId: comment._id }).lean().exec()
await CommentModel.deleteMany({ parentId: comment._id })
if (children) {
await Promise.all(children.map(child => child?._id && CommentModel.deleteMany({ parentId: child._id })))
}
}
})