Ember.js ObjectProxy Class

Last Updated : 23 Jul, 2025

Ember.js is an open-source JavaScript framework used for developing large client-side web applications which is based on Model-View-Controller (MVC) architecture. Ember.js is one of the most widely used front-end application frameworks. It is made to speed up development and increase productivity. Currently, it is utilized by a large number of websites, including Square, Discourse, Groupon, Linked In, Live Nation, Twitch, and Chipotle.

ObjectProxy Class: The ObjectProxy is a proxy object class in Ember.js. All properties not defined by the proxy itself are forwarded to a proxied content object via ObjectProxy.

Methods: The following is the list of methods for this class:

addObserver: This method is used to register an observer for a property.
cacheFor: This method is used to get the cached value for an already computed property if it exists.
decrementProperty: This method is used to set the value of the property to the current value minus some amount.
destroy: This method destroys an object by setting the isDestroyed flag and deleting its metadata.
get: This method is used to retrieve the value of a property from the object.
getProperties: This method is used to get the value of multiple properties at once.
incrementProperty: This method is used to set the value of the property to the current value plus some amount.
init: This method is called when objects are instantiated.
notifyPropertyChange: This method alerts the observer system that a property change has taken place.
removeObserver: This method removes any observers you have registered earlier for this object.
set: This method is used to set the key and value to the object.
setProperties: This method sets a number of properties at once.
toString: This method is to get the string representation of the object.
toggleProperty: This method is used to set the value of the boolean property to the opposite of its current value.
willDestroy: This method tears down the object.

Properties: The following is the list of the properties of this class:

concatenatedProperties: This property specifies the characteristics from the superclass that will be concatenated
content: This property is used to forward the object property.
isDestroyed: This property is the destroy complete flag.
isDestroying: This property is the destroy scheduled flag.
mergedProperties: This property helps to merge the value of the subclass property’s value with the superclass property value of the ember class.

Step 1: To run the following examples you will need to have an ember project with you. To create one, you will need to install ember-cli first. Write the below code in the terminal:

npm install ember-cli

Step 2: Now you can create the project by typing in the following piece of code:

ember new <project-name> --lang en

To start the server, type:

ember serve

Example 1: In this example, I am going to demonstrate the use of the get function.

Type the following code to generate the route for this example:

ember generate route students

app/routes/students.js

JavaScript

import Route from '@ember/routing/route';
import EmberObject from '@ember/object';

export default class StudentsRoute extends Route {
    students = [
        EmberObject.create({ name: 'Rahul',
            Class: 11, marks: 75 }),
        EmberObject.create({ name: 'Sam',
            Class: 12, marks: 59 }),
        EmberObject.create({ name: 'David',
            Class: 11, marks: 67 }),
        EmberObject.create({ name: 'Druv',
            Class: 12, marks: 44 }),
        EmberObject.create({ name: 'Mahan',
            Class: 12, marks: 87 }),
        EmberObject.create({ name: 'Ram',
            Class: 11, marks: 71 }),
        EmberObject.create({ name: 'Dadu',
            Class: 12, marks: 58 })
    ];
    model() {
        return this.students;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('students', this.students);
    }
}

app/controllers/students.js

JavaScript

import Ember from "ember";
import { isAny, isEvery } from "@ember/array";

export default Ember.Controller.extend({
    actions: {
        increase(data) {
            this.students.forEach((item) =>
                item.incrementProperty('marks',
                JSON.parse(data)));
        },
        decrease(data) {
            this.students.forEach((item) =>
                item.decrementProperty('marks',
                JSON.parse(data)));
        },
        remove(item) {
            this.students.set('[]', this.students.without
                (this.students.findBy('name', item)));
        },
        show_first() {
            let ans = this.students.get('firstObject');
            alert(ans.name)
        },
        show_last() {
            let ans = this.students.get('lastObject');
            alert(ans.name)
        },
    },
});

app/template/students.hbs

HTML

{{page-title "get"}}
<h3>Students List: </h3>
<table>
    <tr>
        <th>Name</th>
        <th>Class</th>
            <th>Marks</th>
    </tr>
    {{#each @model as |detail|}}
        <tr>
            <td>{{detail.name}}</td>
            <td>{{detail.Class}}</td>
            <td>{{detail.marks}}</td>
        </tr>
    {{/each}}
</table>
<br />
<div>
    <label>Enter value: </label>
    {{input value=this.item}}
</div>
<input
    type="button"
    id="increase-marks"
    value="Increase All marks by Value"
    {{action "increase" this.item}}
/>
<br /><br />
<div>
    <label>Enter value: </label>
    {{input value=this.item2}}
</div>
<input
    type="button"
    id="decrease-marks"
    value="decrease All marks by Value"
    {{action "decrease" this.item2}}
/>
<br /><br />
<div>
    <label>Enter Name: </label>
    {{input value=this.item3}}
</div>
<input
    type="button"
    id="remove-student"
    value="Remove Student"
    {{action "remove" this.item3}}
/>
<br /><br />
<input
    type="button"
    id="first-student"
    value="Show First Student in list"
    {{action "show_first"}}
/>
<br /><br />
<input
    type="button"
    id="last-student"
    value="Show Last Student in list"
    {{action "show_last"}}
/>
{{outlet}}

Output:

Example 2: In this example, we are going to take a look at the incrementProperty and decrementProperty methods.

Type the following code to generate the route for this example:

ember generate route foods

app/routes/foods.js

JavaScript

import Route from '@ember/routing/route';
import EmberObject from '@ember/object';

export default class FoodsRoute extends Route {

    temp;
    model() {
        return 'Increment Property';
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('temp', this.temp);
        controller.set('temp2', this.temp2);
    }
}

app/controllers/foods.js

JavaScript

import Ember from 'ember';
import EmberObject from '@ember/object';

const Food = EmberObject.extend({
    toStringExtension() {
        return this.get('food');
    }
});
export default Ember.Controller.extend({
    value: 0,
    food: [
        Food.create({
            food: 'apple',
            isFruit: true,
            quant: '1',
        }),
        Food.create({
            food: 'Potato',
            isFruit: false,
            quant: '2',
        }),
        Food.create({
            food: 'Banana',
            isFruit: true,
            quant: '1',
        }),
        Food.create({
            food: 'Burgur',
            isFruit: false,
            quant: '2',
        }),
        Food.create({
            food: 'Orange',
            isFruit: true,
            quant: '1',
        }),
        Food.create({
            food: 'sandwitch',
            isFruit: false,
            quant: '2',
        }),
        Food.create({
            food: 'bean',
            isFruit: false,
            quant: '2',
        }),
    ],
    actions: {
        older() {
            this.incrementProperty('value');
        },
        younger() {
            this.decrementProperty('value');
        },

        addItem(data, data1, data2) {

            let temp = Food.create({
                food: data,
                isFruit: data1,
                quant: data2
            });
            alert(temp.toString() + ' Created');
            this.food.addObject(temp);
        }
    }
});

app/template/foods.hbs

HTML

{{page-title "incrementProperty"}}
<h3>List of Item in Buckets</h3>
<table>
    <tr>
        <th>Food Name </th>
        <th>Bucket </th>
        <th>Fruit </th>
    </tr>
    {{#each this.food as |f|}}
        <tr>
            <td>{{f.food}}</td>
            <td>{{f.quant}}</td>
            <td>{{f.isFruit}}</td>
        </tr>
    {{/each}}
</table>
<br /><br />
<div>
    <label>Enter Item Name: </label>
    {{input value=this.temp2}}
</div>
<br />
<div>
    <label>Enter Quantity in Kg: </label>
    {{input value=this.value}}
</div>
<input
    type="button"
    id="increase"
    value="+"
    {{action "older"}} />
<input
    type="button"
    id="decrease"
    value="-"
    {{action "younger"}} />
<br />
<br />
<div>
    <label>Item is fruit of not : </label>
    {{input value=this.temp}}
</div>
<br /><br />
<input
    type="button"
    id="all-Fruits"
    value="Add item"
    {{action "addItem" this.temp2 this.value this.temp}}
/>
{{outlet}}

Output:

Reference: https://api.emberjs.com/ember/release/classes/objectproxy/

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