scala - play framework - what is the proper way to return list of data? -

i'm new reactive/observables concept.

i've defined route getting products this:

get /products controllers.productcontroller.findproducts

and implementation in controller:

def findproducts() = secured.async { implicit request =>   productdao.find()     .map(products => ok(json.tojson(products)))     // products: list[product]       .recover(errhandler) } 

then, on client-side, i'm making call , subscribing this:

let sub = this.find()   .subscribe(     products => {       this.products = products;       this.productsbehaviorsubject.next( this.products );       if (!!sub)         sub.unsubscribe();     },     error => console.log("error fetching units: " + error)   ); 

as data, unsubscribe it. (basically using promises).
wonder, if right way it. instead of returning list[product] in 1 single response, should returning in several responses??

def findproducts() = secured.async { implicit request =>   productdao.find()     .map(products => {       products.map(p => ok(json.tojson(p))) // haven't tried yet     })     // products: list[product]       .recover(errhandler) } 

then on client side .. maybe .:

this.find()   .take( 50 )   .subscribe(     product => {       this.products.push( product )     },     error => console.log("error fetching units: " + error),     () => this.productsbehaviorsubject.next( this.products )   ); 

your first approach correct, notice secured.async expects code block return future[result]. if try map on products signature future[seq[result]] give compilation error.

also in experience, returning full list in single response standard way code.