ember-object-update

Update Ember objects with ease

Installation

ember install ember-object-update

Ever get tired of dealing with Ember.get and Ember.set when you're trying to update properties on an object, or component?

Does this look familiar?

Ember.set(obj, 'name', Ember.get(obj, 'name').capitalize())

Or this?

actions: {
  doubleAllValues() {
    let oldValue = Ember.get(this, 'someArray');
    let newValue = oldValue.map(v => v * 2)
    Ember.set(this, 'someArray', newValue)
  }
}

If you find yourself wishing there was an easier way to make these kinds of updates, then ember-object-update is for you!

ember-object-update is a simple add-on that (currently) provides a single utility function: update. The update function lets you use a function to compute a new value for a property and update the property all with one function.

update accepts three arguments:

• obj: The object you want to update
• path: A string that contains the path to the value you want to update, e.g. names.nickname
• updateFn: A function whose first argument is the current value of the property you're updating, and whose result is the new value you'd like to set.

Examples

This'll probably be easier if you see it in action, so check out the examples below:

Doubling all the values in an array property

import update from 'ember-object-update';

let obj = Ember.Object.create({
    a: [1, 2, 3]
  });
});

// The old way
Ember.set(obj, 'a', Ember.get(obj, 'a').map(v => v * 2)); // [2, 4, 6]

// Using the `update` method
update(obj, 'a', a => a.map(v => v * 2));

Also, it works in components!

Updating component properties from an action

import update from 'ember-object-update';

export default Ember.Component.extend({
  layout,

  numClicks: 0,

  actions: {
    increment() {
      update(this, 'numClicks', v => v + 1)
    },

    decrement() {
      update(this, 'numClicks', v => v - 1)
    }
  }
});

Crazy nested things (plus array indexes!)

import update from 'ember-object-update';

let crazyNestedPOJO = {
  a: {
    b: [
      {
        c: "some deeply nested value"
      }
    ]
  }
};

update(crazyNestedPOJO, 'a.b.0.c', oldValue => oldValue.toUpperCase());

Closing over local variables in your updater function

import update from 'ember-object-update';

actions: {
  multiply(multiplier) {
    // close over the `multiplier` value when pass our updater function into `update`
    update(this, 'collection', collection => collection.map(v => v * multiplier));
  }
}

Running the dummy app

• ember serve
• Visit your app at http://localhost:4200.

Running Tests

• npm test (Runs ember try:each to test your addon against multiple Ember versions)
• ember test
• ember test --server

Building

• ember build

For more information on using ember-cli, visit http://ember-cli.com/.