[BUGFIX] Setting ArrayProxy#content in willDestroy resets length. #16784
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krisselden
reviewed
Jun 28, 2018
| @@ -230,6 +230,9 @@ export default class ArrayProxy extends EmberObject { | |||
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| this.arrayContentDidChange(0, oldLength, newLength); | |||
| this._addArrangedContentArrayObsever(); | |||
| } else if (key === 'content') { | |||
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at this point we should extract into an invalidate method
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Updated to use a shared _invalidate method.
Prior to this change, `ArrayProxy.prototype.length` was marked as dirty (and therefore recomputed) when `content` was set due to `arrangedContent` being an alias of `content`, and `ArrayProxy` implementing `PROPERTY_DID_CHANGE` to trap `arrangedContent` changes. Unfortunately, `notifyPropertyChange` avoids notifying _some_ things when the object is destroying. This results in the preexisting `PROPERTY_DID_CHANGE` trap for `arrangedContent` is no longer called, and therefore `length` is never marked as dirty. This fixes the condition, by implementing a `content` trap in `PROPERTY_DID_CHANGE` that marks length as dirty. The next time that `length` is accessed it will do the normal work to recalculate.
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Prior to this change,
ArrayProxy.prototype.lengthwas marked as dirty (and therefore recomputed) whencontentwas set due toarrangedContentbeing an alias ofcontent, andArrayProxyimplementingPROPERTY_DID_CHANGEto traparrangedContentchanges.Unfortunately,
notifyPropertyChangeavoids notifying some things when the object is destroying. This results in the preexistingPROPERTY_DID_CHANGEtrap forarrangedContentis no longer called, and thereforelengthis never marked as dirty.This fixes the condition, by implementing a
contenttrap inPROPERTY_DID_CHANGEthat marks length as dirty. The next time thatlengthis accessed it will do the normal work to recalculate./cc @krisselden @runspired