disallow opening same files twice

app/scripts/collections/file-collection.js

@@ -16,6 +16,10 @@ var FileCollection = Backbone.Collection.extend({
 
     getByName: function(name) {
         return this.find(function(file) { return file.get('name') === name; });
+    },
+
+    getById: function(id) {
+        return this.find(function(file) { return file.get('id') === id; });
     }
 });
 

app/scripts/models/app-model.js

@@ -28,8 +28,13 @@ var AppModel = Backbone.Model.extend({
     },
 
     addFile: function(file) {
+        if (this.files.getById(file.get('id'))) {
+            return false;
+        }
         this.files.add(file);
-        file.get('groups').forEach(function(group) { this.menu.groupsSection.addItem(group); }, this);
+        file.get('groups').forEach(function (group) {
+            this.menu.groupsSection.addItem(group);
+        }, this);
         this._addTags(file.db);
         this._tagsChanged();
         this.menu.filesSection.addItem({
@@ -39,6 +44,7 @@ var AppModel = Backbone.Model.extend({
             file: file
         });
         this.refresh();
+        return true;
     },
 
     _addTags: function(group) {

app/scripts/models/file-model.js

@@ -13,6 +13,7 @@ var Backbone = require('backbone'),
 
 var FileModel = Backbone.Model.extend({
     defaults: {
+        id: '',
         name: '',
         keyFileName: '',
         passwordLength: 0,
@@ -122,7 +123,7 @@ var FileModel = Backbone.Model.extend({
         kdbxweb.Kdbx.load(demoFile, credentials, (function(db) {
             this.db = db;
             this.readModel();
-            this.setOpenFile({passwordLength: 4, demo: true, name: 'Demo'});
+            this.setOpenFile({passwordLength: 4, demo: true, name: 'Demo' });
         }).bind(this));
     },
 
@@ -145,6 +146,7 @@ var FileModel = Backbone.Model.extend({
     readModel: function(topGroupTitle) {
         var groups = new GroupCollection();
         this.set({
+            id: this.db.getDefaultGroup().uuid.toString(),
             groups: groups,
             defaultUser: this.db.meta.defaultUser,
             recycleBinEnabled: this.db.meta.recycleBinEnabled,

app/scripts/views/open-view.js

@@ -80,7 +80,9 @@ var OpenView = Backbone.View.extend({
     },
 
     fileOpenChanged: function() {
-        this.model.addFile(this.file);
+        if (!this.model.addFile(this.file)) {
+            this.trigger('cancel');
+        }
     },
 
     fileOpeningChanged: function() {