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add docs regarding observers and computed properties (ref #774) #780

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merged 1 commit into from
May 3, 2012
Merged

add docs regarding observers and computed properties (ref #774) #780

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5 changes: 4 additions & 1 deletion packages/ember-runtime/lib/ext/function.js
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Expand Up @@ -51,7 +51,10 @@ if (Ember.EXTEND_PROTOTYPES) {
});

Make sure you list these dependencies so Ember.js knows when to update
bindings that connect to a computed property.
bindings that connect to a computed property. Changing a dependency
will not immediately trigger an update of the computed property, but
will instead clear the cache so that it is updated when the next `get`
is called on the property.

Note: you will usually want to use `property(...)` with `cacheable()`.

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5 changes: 5 additions & 0 deletions packages/ember-runtime/lib/mixins/observable.js
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Expand Up @@ -61,6 +61,11 @@ var get = Ember.get, set = Ember.set;
This will call the `targetAction` method on the `targetObject` to be called
whenever the value of the `propertyKey` changes.

Note that if `propertyKey` is a computed property, the observer will be
called when any of the property dependencies are changed, even if the
resulting value of the computed property is unchanged. This is necessary
because computed properties are not computed until `get` is called.

@extends Ember.Mixin
*/
Ember.Observable = Ember.Mixin.create(/** @scope Ember.Observable.prototype */ {
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