i am trying to have an observer execute when a model is loaded
sortAttachments:function(){
console.log('sorting')
var attachments = this.get('model').get('attachments');
for(var i = 0;i<attachments.length;i++){
var a = attachments[i];
if(a.type=="Link"){
links.push(a)
}
}
}.observes('models.attachments.#each.type'),
the method is currently being called twice, if i change the observes statement to
observes('blablabla'),
it also gets called twice.
the method must only execute when the attachments property of the model updates
the model code :
App.Card = DS.Model.extend({
title: DS.attr('string'),
description: DS.attr('string'),
left: DS.attr('number'),
top: DS.attr('number'),
user: DS.belongsTo('user', { async: true }),
attachments: DS.hasMany('attachment',{async:true}),
tags:DS.hasMany('tag',{async:true})
});
Additionally you can observe the state of the model using the current state
App.ApplicationController = Em.ObjectController.extend({
timesFired: 0,
watcher: function(){
if(this.get('model.currentState.stateName') == 'root.loaded.saved'){
this.incrementProperty('timesFired');
}
}.observes('model.currentState.stateName')
});
http://jsbin.com/aYIkAcUk/9/edit
I think that your observer is called multiple times because for each item loaded in attachments relationship, the model.attachments.#each.type is triggered. You can use Ember.run.once to collapse all these calls in a single one:
sortAttachments:function(){
console.log('sorting')
var attachments = this.get('model').get('attachments');
for(var i = 0;i<attachments.length;i++){
var a = attachments[i];
if(a.type=="Link"){
links.push(a)
}
}
},
sortAttachmentsOnce: function() {
Ember.run.once(this, this.sortAttachments);
}.observes('model.attachments.#each.type'),
I hope it helps
Related
I have a list of product-tag that I fetch for my model.
Route:
model: function() {
return {
product_tags: this.store.find('product-tag', {merchant: merchId})
}
}
I have a component that adds tags to the model, however when after I create the record and push it into the model (as suggested on other posts) my UI still isn't updating.
addTag: function(name) {
tag = this.store.createRecord('product-tag', {
name: name
});
this.model.product_tags.toArray().addObject(tag);
tag.save();
}
//model merchant.js
export default DS.Model.extend({
user_id: DS.attr('number'),
product_tags: DS.hasMany('product-tag', {async: true})
});
//model product-tag.js
export default DS.Model.extend({
merchant: DS.belongsTo('merchant'),
name: DS.attr('string'),
});
What am I doing wrong? Thanks in advance.
You should make it array in the route, so u can use it always afterwards like u want. Your calling toArray() which makes a new Array instance, then your model is not hooked to the array u just made.
model: function() {
return {
product_tags: this.store.query('product-tag', {merchant: merchId}).then(function(pt) {
return pt.toArray();
});
}
}
var x = this.get('model.product_tags') === model's p_t // true
var y = this.get('model.product_tags').toArray() === model's p_t // false
Later on just do
addTag: function(name) {
this.get('store').createRecord('product-tag', {
name: name
}).save().then(function(saved){
this.get('model.product_tags').pushObject(saved);
}.bind(this);
}
I have a controller for showing item.
Users can put the item in their wish list.
(Item has many users, User has many Items.)
So, when user enter the webpage, I want to show a AddToList or RemoveFromList button to the user based on isAddedToList property.
Below is the code.
User Model:
var User = DS.Model.extend({
username: DS.attr('string'),
email: DS.attr('string'),
avatar: DS.attr('string'),
items: DS.hasMany("item", { async: true })
});
export default User;
ItemModel:
var Item = DS.Model.extend({
name: DS.attr("string"),
priceInCent: DS.attr("number"),
salePriceInCent: DS.attr("number"),
brand: DS.belongsTo("brand"),
itemImages: DS.hasMany("itemImage", { async: true }),
users: DS.hasMany("user", { async: true }),
});
export default Item;
ItemRoute:
var ItemRoute = Ember.Route.extend({
model: function(params) {
var userId = this.get("session").get("userId");
return Ember.RSVP.hash({
item: this.store.find('item', params.item_id),
user: this.store.find('user', userId),
});
},
setupController: function(controller, model) {
controller.set('item', model.item);
controller.set('user', model.user);
}
});
export default ItemRoute;
ItemController:
var ItemController = Ember.Controller.extend({
needs: ["current-user", "application"],
currentUser: Ember.computed.alias("controllers.current-user"),
isAddedToList: function() {
var promiseUsers = this.get("item.users"), user = this.get("user");
return promiseUsers.contains(user);
}.property("item"),
actions: {
addToList: function() {
var item = this.get("item"), user = this.get("user");
item.get("users").pushObject(user);
item.set("addedUserIds", [user.get("id")]);
item.save();
},
removeFromList: function() {
var item = this.get("item"), user = this.get("user");
item.get("users").removeObject(user);
item.set("removedUserIds", [user.get("id")]);
item.save();
}
}
});
export default ItemController;
The problem is when I check the length of promiseUsers with
promiseUsers.get("length")
it always returns 0.
but when I try the same with Chrome console, it returns the length properly.
Do I miss something in the route? How to fix the problem?
The problem is you're using your code synchronously, despite it being an asynchronous property.
The first time you attempt to use an async relationship it will begin resolving the relationship, making a callback to the server is necessary. In your case you try to use the users right away, but they are going to be empty the first time, so you're contains will return false. Since you aren't watching the users' collection it will then update, but the computed property won't update since the computed property was just watching item. This is why when you try it from the console it works, because by the time you attempt to use it in the console it's finished resolving the async collection of users.
isAddedToList: function() {
var promiseUsers = this.get("item.users"), user = this.get("user");
return promiseUsers.contains(user);
}.property("user", 'item.users.[]')
I have set up the following scaffolding for my Ember application.
window.App = Ember.Application.create({});
App.Router.map(function () {
this.resource('coaches', function() {
this.resource('coach', {path: "/:person_id"});
});
});
App.ApplicationAdapter = DS.FixtureAdapter.extend({});
App.Person = DS.Model.extend({
fname: DS.attr('string')
,lname: DS.attr('string')
,sport: DS.attr('string')
,bio: DS.attr('string')
,coach: DS.attr('boolean')
,athlete: DS.attr('boolean')
});
App.Person.FIXTURES = [
{
id: 10
,fname: 'Jonny'
,lname: 'Batman'
,sport: 'Couch Luge'
,bio: 'Blah, blah, blah'
,coach: true
,athlete: true
}
,{
id: 11
,fname: 'Jimmy'
,lname: 'Falcon'
,sport: 'Cycling'
,bio: 'Yada, yada, yada'
,coach: false
,athlete: true
}
];
I am trying to set up a route to filter the person model and return only coaches. Just to make sure I can access the data, I have simply used a findAll on the person model.
App.CoachesRoute = Ember.Route.extend({
model: function() {
return this.store.findAll('person');
}
});
Now though, I am trying to implement the filter method detailed on the bottom of the Ember.js Models - FAQ page.
App.CoachesRoute = Ember.Route.extend({
model: function() {
var store = this.store;
return store.filter('coaches', { coach: true }, function(coaches) {
return coaches.get('isCoach');
});
}
});
The coaches route is not working at all with the new route implemented and the old one commented out. I am using the Ember Chrome extension and when using the filter route the console responds with, Error while loading route: Error: No model was found for 'coaches'. Apparently the route is not working, specifically the model. No kidding, right? What am I missing in my filter model route?
Thank you in advance for your help.
The error message is spot on- there is no CoachModel. I think you need to do this:
App.CoachesRoute = Ember.Route.extend({
model: function() {
var store = this.store;
return store.filter('person', { coach: true }, function(coaches) {
return coaches.get('isCoach');
});
}
});
I'd like to be able to modify/validate data before actually saving.
Model
App.Post = DS.Model.extend({
title: DS.attr('string'),
author: DS.attr('string'),
date: DS.attr('date', { defaultValue: new Date() }),
excerpt: DS.attr('string'),
body: DS.attr('string')
});
Route
App.PostsNewRoute = Ember.Route.extend({
model: function() {
return this.get('store').createRecord('post');
},
actions: {
doneEditing: function() {
debugger;
this.modelFor('postsNew').save();
this.transitionTo('posts.index');
}
}
});
So, the questions, before the .save() I want to, let's say, validate that the title is not empty or so.
Everything I've tried gets undefined, or [Object object] has no .val() method. I don't know how to get to the values of the model. How can I do that?
And the other thing I have in mind. Is that defaultValue working as intended? I want to set Date() to every new created post. Somehow date is not being recorded since it's not showing.
Thanks.
App.PostsNewRoute = Ember.Route.extend({
model: function() {
return this.get('store').createRecord('post');
},
actions: {
doneEditing: function() {
debugger;
var model = this.modelFor('postsNew');
var title = model.get('title');
model.save();
this.transitionTo('posts.index');
}
}
});
I have ember models called survey, question, and response. surveys have multiple questions, which have multiple responses. Each response has an attribute count.
How do I set a total_response_count computed value in the survey model? In emberjs 1.0.0, the questions are in a DS.PromiseArray (due to the async: true), so when I return the computed value, it shows up in my template as an Object rather than a value.
I can easily access responses from the question model because responses are embedded in question. However, Ember automatically makes promises for the questions referenced by survey because {async: true}.
Survey Model:
App.Survey = DS.Model.extend({
title: DS.attr('string'),
owner_id: DS.belongsTo('user'),
questions: DS.hasMany('question', {async:true}),
total_responses: function() {
var question_cb = function(prevValue, item) {
return prevValue + item.get('total_responses');
};
return this.get('questions').then(function(questions){
return questions.reduce(question_cb, 0);
});
}.property('questions')
});
Question Model:
App.Question = DS.Model.extend({
survey: DS.belongsTo('survey'),
question: DS.attr('string'),
responses: DS.hasMany('response'),
total_responses: function() {
var response_cb = function(prevValue, item) {
return prevValue + item.get('count');
};
return this.get('responses').reduce(response_cb, 0);
}.property('responses')
});
Response Model:
App.Response = DS.Model.extend({
response: DS.attr('string'),
count: DS.attr('number'),
question: DS.belongsTo('question')
});
I'm using ember-1.0.0 and ember-data 1.0 beta-2.
I also asked this question on Github, and got this response from Yehuda Katz:
You can try something like this:
App.Survey = DS.Model.extend({
title: DS.attr(),
owner: DS.belongsTo('user'),
questions: DS.hasMany({ async:true }),
totalResponses: Ember.arrayComputed('questions', {
initialValue: 0,
addedItem: function(accum, item) {
accum += item.get('totalResponses');
},
removedItem: function(accum, item) {
accum -= item.get('totalResponses');
}
})
});
When questions resolves, the addedItem callback in totalResponses will be called once for every item in the resolved array.