How to delete an item by uid dgraph-js

Could you possibly give me an example because I have the post type which looks like this

Post.clickedOn: [uid] .
Post.comments: [uid] .
Post.hashtag: uid .
Post.likes: [uid] .
Post.postId: string @index(exact) .
Post.username: string .
type Post {
	Post.postId
	Post.username
	Post.likes
	Post.comments
	Post.hashtag
}

Do i have to supply each item and not just the uid? is that what you mean? maybe an example besides the basic would be good. Thank you