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I modified your JSbin <a href="http://jsbin.com/ucanam/1975/" rel="nofollow">http://jsbin.com/ucanam/1975/</a> If you want to persist records you must create them in the store with createRecord() and then save() them. The new newLink function <pre><code> newLink: function() { var store = this.get("store"), linkName = this.get("linkName"), linkUrl = this.get("linkUrl"), links = this.get("links"), selectedLabels = this.get('selectedLabels'); if(selectedLabels.get('length') > 0) { if(linkName.length > 0 && linkUrl.length > 0) { var newLink = store.createRecord('link', { name: linkName, url: linkUrl }); selectedLabels.forEach(function(label){ newLink.get('labels').addObject(label); }); newLink.save().then(function(link){ links.addObject(link); }); this.set("linkName", ""); this.set("linkUrl", ""); } } else { alert("You have to select a label!"); } }, </code></pre> For deleting records there are problems using forEach because the result of a find to the store is a live array. You can see this discussion in GitHub <a href="https://github.com/emberjs/data/issues/772" rel="nofollow">https://github.com/emberjs/data/issues/772</a>. So your remove label function should be (note the use of toArray() to make a static copy of the live array) <pre><code> remove: function() { var indexController = this.get('controllers.index'), label = this.get('model'), linksPromise = this.get('store').find('link'); linksPromise.then(function(links){ links.toArray().forEach(function(link){ var linkLabels = link.get('labels'), linkLabelsIds = linkLabels.mapProperty('id'); if(linkLabelsIds.contains(label.get("id"))) { if(linkLabelsIds.get("length") == 1) { console.log("delete link: "+link.get("name")); indexController.get("links").removeObject(link); link.deleteRecord(); link.save(); } } }); label.deleteRecord(); label.save(); }); } </code></pre> Final note, don't forget to make a save() on the records after deleting them, jsBin here: <a href="http://jsbin.com/ucanam/1989/" rel="nofollow">http://jsbin.com/ucanam/1989/</a>
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