angularjs - Meteor reactive sources -

i have app there 5 collections: 1 books, 1 types (of books, fantasy, sci-fi...), 1 languages, 1 subscribtions (including type_id, lang_id , user_id) , last 1 if meteor.users.

i created helper function retrieve books fitting subscribtions of each user (i'm using angular-meteor)

$scope.helpers({ userbooks:function(){             var subbooks=[];             var books;             var user_id=meteor.userid();             subscribtions.find({user_id:user_id}).foreach(function(sub){                 books=books.find({type_id:sub.type_id,lang_id:sub.lang_id}).fetch();                 for(var i=0;i<books.length;i++){                     subbooks.push(books[i]);                 }             });             return subbooks;         } }) 

suppose new book or new subscribtions added, or user logs it, subbooks data updates? considered reactive (because contains reactive data)?

i suggest simplify , publish joined collection of subscriptions , books server using reywood:publish-composite package.

server:

meteor.publishcomposite('mysubs', {   find: function() { // find subscriptions current user             return subscriptions.find({ userid: this.userid });   },   children: [     {       find: function(sub) { // find books related current subscription 'sub'                     return books.find({ type_id: sub.type_id, lang_id: sub.lang_id});       }     }   ] }); 

on client:

meteor.subscribe('mysubs'); 

then can find books current user interested in books.find()

this make app faster reducing number of subscriptions , books sending server client.

note: on time might find confusing name collection subscriptions since term core meteor concept.