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Set object in data from a method in VUE.js

I have been stuck with this issues for 2 hours now and I really can't seem to get it work.
const app = new Vue({
el: '#book-search',
data: {
searchInput: 'a',
books: {},
},
methods: {
foo: function () {
axios.get('https://www.googleapis.com/books/v1/volumes', {
params: {
q: this.searchInput
}
})
.then(function (response) {
var items = response.data.items
for (i = 0; i < items.length; i++) {
var item = items[i].volumeInfo;
Vue.set(this.books[i], 'title', item.title);
}
})
.catch(function (error) {
console.log(error);
});
}
}
});
When I initiate search and the API call I want the values to be passed to data so the final structure looks similar to the one below.
data: {
searchInput: '',
books: {
"0": {
title: "Book 1"
},
"1": {
title: "Book 2"
}
},
Currently I get Cannot read property '0' of undefined.

Problem lies here:
Vue.set(this.books[i], 'title', item.title);
You are inside the callback context and the value of this is not the Vue object as you might expect it to be. One way to solve this is to save the value of this beforehand and use it in the callback function.
Also instead of using Vue.set(), try updating the books object directly.
const app = new Vue({
el: '#book-search',
data: {
searchInput: 'a',
books: {},
},
methods: {
foo: function () {
var self = this;
//--^^^^^^^^^^^^ Save this
axios.get('https://www.googleapis.com/books/v1/volumes', {
params: {
q: self.searchInput
//-^^^^--- use self instead of this
}
})
.then(function (response) {
var items = response.data.items
var books = {};
for (i = 0; i < items.length; i++) {
var item = items[i].volumeInfo;
books[i] = { 'title' : item.title };
}
self.books = books;
})
.catch(function (error) {
console.log(error);
});
}
}
});
Or if you want to use Vue.set() then use this:
Vue.set(self.books, i, {
'title': item.title
});
Hope this helps.

yep, the problem is about context. "this" returns not what you expect it to return.
you can use
let self = this;
or you can use bind
function(){this.method}.bind(this);
the second method is better.
Also google something like "how to define context in js", "bind call apply js" - it will help you to understand what is going wrong.

// update component's data with some object's fields
// bad idea, use at your own risk
Object
.keys(patch)
.forEach(key => this.$data[key] = patch[key])

How to get related data from "joined" Firebase collections - AngularFire [duplicate]

I am currently working on an app using firebase and angularJS (ionic). Basically this is a car management app, so you have people sharing their cars with others. I tried to structure the data as flat as possible to be efficient. My issue here is that if without problem I can display the list of the car_id of the different cars shared with the logged user, I can't find a way to display the list of cars shared with the user displaying the year and the model.
Thank you in advance for your help !
{
"rules": {
"users": {
".write": true,
"$uid": {
".read": "auth != null && auth.uid == $uid"
},
"cars": {
"car_id":true,
"role":true // Owner, borower...
}
},
"cars": {
"car_id":true,
"model":true,
"year":true
}
}
}
carapp.controller("carsController", function($scope, $firebaseObject, $ionicPopup, $ionicHistory) {
$ionicHistory.clearHistory();
$scope.list = function() {
frbAuth = frb.getAuth();
if(frbAuth) {
var userObject = $firebaseObject(frb.child("users/" + frbAuth.uid));
userObject.$bindTo($scope, "user");
$scope.cars = frb.child("cars");
}}
$scope.createCar = function() {
$ionicPopup.prompt({
model: 'Create a new car',
inputType: 'text'
})
.then(function(result) {
if(result !== "") {
var newCar = $scope.cars.push({
model: result
})
var newCarId = newCar.key();
$scope.user.cars.push({car_id: newCarId, role: "owner" });
} else {
console.log("Action not completed");
}
});
}
});
<div class="list">
<a ng-repeat="car in user.cars" >
<h2>{{car.car_id}}</h2> ----> works fine !
<h2>{{car.model}}</h2> ----> How to get this working ?
<h2>{{car.year}}</h2> ----> How to get this working ?
</a>
</div>

In the users/ path, begin by storing the list of cars by index, instead of in an array. So your structure would be:
{
"users": {
"kato": {
"cars": {
"DeLorean": true
}
}
},
"cars": {
"DeLorean": {
model: "DeLorean",
year: "1975"
}
}
}
To join this using AngularFire, you have several approaches available. An AngularFire-only solution might look like this, taking advantage of $extend:
app.factory('CarsByUser', function($firebaseArray) {
return $firebaseArray.$extend({
$$added: function(snap) {
return new Car(snap);
},
$$updated: function(snap) {
// nothing to do here; the value of the index is not used
},
$$removed: function(snap) {
this.$getRecord(snap.key()).destroy();
},
// these could be implemented in a manner consistent with the
// use case and above code, for simplicity, they are disabled here
$add: readOnly,
$save: readOnly
});
var carsRef = new Firebase(...).child('cars');
function Car(snap) {
// create a reference to the data for a specific car
this.$id = snap.key();
this.ref = carsRef.child(this.$id);
// listen for changes to the data
this.ref.on('value', this.updated, this);
}
Car.prototype.updated = function(snap) {
this.model = data.model;
this.year = data.year;
}
Car.prototype.destroy = function() {
this.ref.off('value', this.meta, this);
};
function readOnly() { throw new Error('This is a read only list'); }
});
app.controller('...', function($scope, CarsByUser, authData) {
// authenticate first, preferably with resolve
var ref = new Firebase(...).child(authData.uid);
$scope.cars = CarsByUser($scope);
});
For a more sophisticated and elegant approach, one could utilize NormalizedCollection and pass that ref into the AngularFire array:
app.controller('...', function($scope, $firebaseArray) {
var ref = new Firebase(...);
var nc = new Firebase.util.NormalizedCollection(
ref.child('users/' + authData.uid),
ref.child('cars')
)
.select('cars.model', 'cars.year')
.ref();
$scope.cars = $firebaseArray(nc);
});

How to merge results of two queries using FirebaseArray [duplicate]

I am currently working on an app using firebase and angularJS (ionic). Basically this is a car management app, so you have people sharing their cars with others. I tried to structure the data as flat as possible to be efficient. My issue here is that if without problem I can display the list of the car_id of the different cars shared with the logged user, I can't find a way to display the list of cars shared with the user displaying the year and the model.
Thank you in advance for your help !
{
"rules": {
"users": {
".write": true,
"$uid": {
".read": "auth != null && auth.uid == $uid"
},
"cars": {
"car_id":true,
"role":true // Owner, borower...
}
},
"cars": {
"car_id":true,
"model":true,
"year":true
}
}
}
carapp.controller("carsController", function($scope, $firebaseObject, $ionicPopup, $ionicHistory) {
$ionicHistory.clearHistory();
$scope.list = function() {
frbAuth = frb.getAuth();
if(frbAuth) {
var userObject = $firebaseObject(frb.child("users/" + frbAuth.uid));
userObject.$bindTo($scope, "user");
$scope.cars = frb.child("cars");
}}
$scope.createCar = function() {
$ionicPopup.prompt({
model: 'Create a new car',
inputType: 'text'
})
.then(function(result) {
if(result !== "") {
var newCar = $scope.cars.push({
model: result
})
var newCarId = newCar.key();
$scope.user.cars.push({car_id: newCarId, role: "owner" });
} else {
console.log("Action not completed");
}
});
}
});
<div class="list">
<a ng-repeat="car in user.cars" >
<h2>{{car.car_id}}</h2> ----> works fine !
<h2>{{car.model}}</h2> ----> How to get this working ?
<h2>{{car.year}}</h2> ----> How to get this working ?
</a>
</div>

In the users/ path, begin by storing the list of cars by index, instead of in an array. So your structure would be:
{
"users": {
"kato": {
"cars": {
"DeLorean": true
}
}
},
"cars": {
"DeLorean": {
model: "DeLorean",
year: "1975"
}
}
}
To join this using AngularFire, you have several approaches available. An AngularFire-only solution might look like this, taking advantage of $extend:
app.factory('CarsByUser', function($firebaseArray) {
return $firebaseArray.$extend({
$$added: function(snap) {
return new Car(snap);
},
$$updated: function(snap) {
// nothing to do here; the value of the index is not used
},
$$removed: function(snap) {
this.$getRecord(snap.key()).destroy();
},
// these could be implemented in a manner consistent with the
// use case and above code, for simplicity, they are disabled here
$add: readOnly,
$save: readOnly
});
var carsRef = new Firebase(...).child('cars');
function Car(snap) {
// create a reference to the data for a specific car
this.$id = snap.key();
this.ref = carsRef.child(this.$id);
// listen for changes to the data
this.ref.on('value', this.updated, this);
}
Car.prototype.updated = function(snap) {
this.model = data.model;
this.year = data.year;
}
Car.prototype.destroy = function() {
this.ref.off('value', this.meta, this);
};
function readOnly() { throw new Error('This is a read only list'); }
});
app.controller('...', function($scope, CarsByUser, authData) {
// authenticate first, preferably with resolve
var ref = new Firebase(...).child(authData.uid);
$scope.cars = CarsByUser($scope);
});
For a more sophisticated and elegant approach, one could utilize NormalizedCollection and pass that ref into the AngularFire array:
app.controller('...', function($scope, $firebaseArray) {
var ref = new Firebase(...);
var nc = new Firebase.util.NormalizedCollection(
ref.child('users/' + authData.uid),
ref.child('cars')
)
.select('cars.model', 'cars.year')
.ref();
$scope.cars = $firebaseArray(nc);
});

Custom non REST method in Backbone collection

This is my Backbone collection:
var TodoList = Backbone.Collection.extend({
// Reference to this collection's model.
model: Todo,
url: function () {
return 'api/todos';
},
// Filter down the list of all todo items that are finished.
done: function () {
return this.filter(function (todo) { return todo.get('done'); });
},
// Filter down the list to only todo items that are still not finished.
remaining: function () {
return this.without.apply(this, this.done());
},
// We keep the Todos in sequential order, despite being saved by unordered
// GUID in the database. This generates the next order number for new items.
nextOrder: function () {
if (!this.length) return 1;
return this.last().get('order') + 1;
},
// Todos are sorted by their original insertion order.
comparator: function (todo) {
return todo.get('order');
},
addToDo: function (opts) {
var model = this;
opts.url = model.url() + '/AddToDo'
// add any additional options, e.g. a "success" callback or data
_.extend(options, opts);
return (this.sync || Backbone.sync).call(this, null, this, options);
}
});
This works fine and I can hit my URL endpoint. However, the issue is with the built in create defined in Backbone collection, the model gets automatically added to the collection once create is called. With my custom method addToDo the to-do is added successfully but I can't see it in my view unless I refresh the page.
What am I missing? Any help is appreciated!

.create is syntactic sugar around model.save and collection.add
If you're model is being created in a different way, you need to override your sync method on the model to something like:
sync: function (method, model, options) {
options || (options = {});
if (method === 'create') {
options.url = _.result(model, 'url') + '/AddToDo';
}
return Backbone.Model.prototype.sync.call(this, method, model, options);
}

Emberjs dynamic segment: Error while loading route: TypeError {}

I'm trying to get familiar with dynamic segment here. Here is what I want to achieve:
When i access '/#/inventories', it will list the inventory model in the 'inventories' template. This is done successfully.
When i click on the individual inventory id, it will access /#/inventories/1 be 1 is the inventory id, and it will fire up the 'inventory' template. This is done successfully as well.
However when i try to access /#/inventories/1 directly from the address bar, when i press F5, it comes out this error - Error while loading route: TypeError {}
The full list of error:
Uncaught TypeError: Object function () {
if (!wasApplied) {
Class.proto(); // prepare prototype...
}
o_defineProperty(this, GUID_KEY, undefinedDescriptor);
o_defineProperty(this, '_super', undefinedDescriptor);
var m = meta(this);
m.proto = this;
if (initMixins) {
// capture locally so we can clear the closed over variable
var mixins = initMixins;
initMixins = null;
this.reopen.apply(this, mixins);
}
if (initProperties) {
// capture locally so we can clear the closed over variable
var props = initProperties;
initProperties = null;
var concatenatedProperties = this.concatenatedProperties;
for (var i = 0, l = props.length; i < l; i++) {
var properties = props[i];
Ember.assert("Ember.Object.create no longer supports mixing in other definitions, use createWithMixins instead.", !(properties instanceof Ember.Mixin));
for (var keyName in properties) {
if (!properties.hasOwnProperty(keyName)) { continue; }
var value = properties[keyName],
IS_BINDING = Ember.IS_BINDING;
if (IS_BINDING.test(keyName)) {
var bindings = m.bindings;
if (!bindings) {
bindings = m.bindings = {};
} else if (!m.hasOwnProperty('bindings')) {
bindings = m.bindings = o_create(m.bindings);
}
bindings[keyName] = value;
}
var desc = m.descs[keyName];
Ember.assert("Ember.Object.create no longer supports defining computed properties.", !(value instanceof Ember.ComputedProperty));
Ember.assert("Ember.Object.create no longer supports defining methods that call _super.", !(typeof value === 'function' && value.toString().indexOf('._super') !== -1));
if (concatenatedProperties && indexOf(concatenatedProperties, keyName) >= 0) {
var baseValue = this[keyName];
if (baseValue) {
if ('function' === typeof baseValue.concat) {
value = baseValue.concat(value);
} else {
value = Ember.makeArray(baseValue).concat(value);
}
} else {
value = Ember.makeArray(value);
}
}
if (desc) {
desc.set(this, keyName, value);
} else {
if (typeof this.setUnknownProperty === 'function' && !(keyName in this)) {
this.setUnknownProperty(keyName, value);
} else if (MANDATORY_SETTER) {
Ember.defineProperty(this, keyName, null, value); // setup mandatory setter
} else {
this[keyName] = value;
}
}
}
}
}
finishPartial(this, m);
delete m.proto;
finishChains(this);
this.init.apply(this, arguments);
} has no method 'find'
Here is my app.js:
Gymi = Ember.Application.create();
// Route map
Gymi.Router.map(function() {
this.resource('inventories', { path: '/inventories' }, function() {
this.resource('inventory', { path: '/:inventory_id' });
});
this.resource('products');
});
// inventory models
Gymi.Inventory = Ember.Object.extend();
Gymi.Inventory.reopenClass({
items: [],
all: function() {
this.items = [{
id: 1,
name: 'item1',
cost: '20.00',
qty: 10
}, {
id: 2,
name: 'item2',
cost: '20.00',
qty: 10
}, {
id: 3,
name: 'item3',
cost: '20.00',
qty: 10
}, {
id: 4,
name: 'item4',
cost: '20.00',
qty: 10
}];
return this.items;
}
})
// inventory controller
Gymi.InventoriesController = Ember.Controller.extend({
inventories: Gymi.Inventory.all()
});
Here is the templates:
<script type="text/x-handlebars">
<h2>{{title}}</h2>
<ul>
<li>{{#linkTo 'inventories'}}Inventories{{/linkTo}}</li>
</ul>
{{outlet}}
</script>
<script type="text/x-handlebars" data-template-name="inventories">
<h2>Inventory</h2>
<table class="table">
<tbody>
{{#each inventory in inventories}}
{{#with inventory}}
<tr>
<td>{{#linkTo 'inventory' inventory}}{{id}}{{/linkTo}}</td>
<td>{{name}}</td>
<td>{{cost}}</td>
<td>{{qty}}</td>
</tr>
{{/with}}
{{/each}}
</tbody>
</table>
{{outlet}}
</script>
<script type="text/x-handlebars" data-template-name="inventory">
<h4>Inventory</h4>
<ul>
<li>{{id}}</li>
<li>{{name}}</li>
<li>{{cost}}</li>
<li>{{qty}}</li>
</ul>
</script>

Not an answer to the OP but to all those who are getting the error after Sept 1, 2013, it might be due to the update of Ember Data to the latest 1.0 version. So you have to use
this.store.find('model');
Instead of
App.Model.find();
Read more changes here.

That's an unhelpful error message, but the key part is at the end of it.
this.init.apply(this, arguments);
} has no method 'find'
When you visit the /inventories/1 route, ember will try to lookup the record for that id, using find, in the InventoryRoute's model hook. In this case on the Inventory. Since it can't find that method you get this error.
Adding an Inventory.find method that returns the record matching params.inventory_id will fix this issue.

This error appears if your route is missing the parameter of the model method.
The following code works when visiting /inventory/1 from a link-to but not opening the page from the URL:
App.InventoryRoute = Ember.Route.extend({
model: function() {
this.store.find('inventory', params.inventory_id)
}
});
Adding the missing params fixes. This code works both from a link-to and directly from the URL:
App.InventoryRoute = Ember.Route.extend({
model: function(params) {
this.store.find('inventory', params.inventory_id)
}
});
For ember-data < 0.14 this is the code
App.InventoryRoute = Ember.Route.extend({
model: function(params) {
App.Inventory.find(params.inventory_id)
}
});