ember.js - How do you save a many-to-many relationship in Ember and Firebase -

let's have many medicines can prescribed many patients. our model this:

app.medicine = ds.model.extend({   name: ds.attr(),   patients: ds.hasmany('user', { async: true }),  });  app.user = ds.model.extend({   name: ds.attr(),   medicines: ds.hasmany('medicine', { async: true }) }); 

in scenario, how save records firebase store?

app = ember.application.create();  app.applicationadapter = ds.firebaseadapter.extend({   firebase: new firebase('https://your_firebase.firebaseio.com/') });   app.router.map(function(){ });  app.medicine = ds.model.extend({   name: ds.attr(),   patients: ds.hasmany('user', { async: true }),  });  app.user = ds.model.extend({   name: ds.attr(),   medicines: ds.hasmany('medicine', { async: true }) });  app.indexroute = ember.route.extend({   model: function() {     var medicines = this.store.find('medicine');     var users = this.store.find('user');     return {       medicines: medicines,       users: users     };   },   actions: {     savepost: function(){       var store = this.store;       var medicine1 = store.createrecord('medicine', {name: 'aspirin'});       var patient1 = store.createrecord('user', {name: 'jane'});       var patient2 = store.createrecord('user', {name: 'peter'});       medicine1.save()       .then(function(){         return ember.rsvp.promise.all([           patient1.save(),           patient2.save()         ])        .then(function(){           var promises = [];           var patientsofmedicine1 = medicine1.get('patients');           var medicinesofpatient1 = patient1.get('medicines');           var medicinesofpatient2 = patient2.get('medicines');           promises.push(patientsofmedicine1, medicinesofpatient1, medicinesofpatient2);           return ember.rsvp.promise.all(promises);         })         .then(function(arrayofattachedarrays){           var promises = [];           var patientsofmedicine1 = arrayofattachedarrays[0];           var medicinesofpatient1 = arrayofattachedarrays[1];           var medicinesofpatient2 = arrayofattachedarrays[2];           patientsofmedicine1.addobjects(patient1, patient2);           medicinesofpatient1.addobject(medicine1);           medicinesofpatient2.addobject(medicine1);           promises.addobjects(medicine1.save(),patient1.save(),patient2.save());           return ember.rsvp.promise.all(promises);         });        });     }   } }); 

notes:

• thanks david govea showing me how works.
• if there's better way this, please post below.