Dynamic Segment without parent

Im trying to achieve something like this

this.route('article',{path:'/:slug'})

but ended up using like this

this.route('article',{path:'post/:slug'})

is it possible to use the first one?. because when i tried it works when it the link is trigger but when i access it directly its not working

I also check the all the request on console its the model is not requesting when i access directly but works when the link is click