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[BUGFIX beta] fix for lastObject/firstObject update issue #15510

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merged 1 commit into from
Jul 18, 2017
Merged

[BUGFIX beta] fix for lastObject/firstObject update issue #15510

merged 1 commit into from
Jul 18, 2017

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bekzod
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@bekzod bekzod commented Jul 16, 2017

enhanced #15110 PR, @stefanpenner

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stefanpenner requested changes Jul 16, 2017
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packages/ember-runtime/lib/mixins/array.js Outdated
propertyWillChange(array, 'lastObject', meta);
propertyDidChange(array, 'lastObject', meta);
if (cache !== undefined) {
if (cache.firstObject !== undefined && startIdx === 0 && objectAt(array, 0) !== cacheFor.get(cache, 'firstObject')) {
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i think one of the goals @hjdivad had, was to avoid the objectAt(x) lookups, as they would force the CP to be accessed.

I'll ping @hjdivad to chime in.

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yeah but you need to invalidate cp when it changes no ?

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If the index for firstObject / lastObject changed, then we should broadcast. Even if the object is equal. That means we wont need both the objectAt stuff and the range based detection.

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bekzod commented Jul 17, 2017

I updated my PR, so it does not call objectAt but now behavior is changed of firstObject/lastObject change event, so now it notifies change even if same object as firstObject/lastObject is shifted/pushed to array , I think it is still better than how was before.
adjusted/added test accordingly @stefanpenner

@bekzod bekzod force-pushed the array-first-last-object branch 2 times, most recently from 2754363 to b036634 Compare July 17, 2017 14:40
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@bekzod ya, that was the approach @hjdivad was taking. It is likely a trade-off we are good with.

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hjdivad suggested changes Jul 17, 2017
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packages/ember-runtime/lib/mixins/array.js Outdated
}
if (cache !== undefined) {
if (cache.firstObject !== undefined && startIdx === 0) {
propertyWillChange(array, 'firstObject');
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This PR drops && (addAmt > 0 || removeAmt > 0) because we can safely assume one of those must be > 0?

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(which is fine, just want to confirm)

packages/ember-runtime/lib/mixins/array.js Outdated

let lastIndex = length - delta - 1;
let lastAffectedIndex = startIdx + removedAmount;
if (lastIndex < lastAffectedIndex) {
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I think this will miss cases where lastObject changes from negative indices, eg

[0, 1, 2, 3].replace(-2, 2);
// => [0, 1]

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thanks, was not sure if negative startIndex could be passed will handle that

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awesome thanks @bekzod 👍

packages/ember-runtime/tests/suites/mutable_array/pushObject.js
@@ -54,4 +54,26 @@ suite.test('[A,B,C].pushObject(X) => [A,B,C,X] + notify', function() {
equal(observer.validate('firstObject'), false, 'should NOT have notified firstObject');
});

suite.test('[A,B,C,C].pushObject(A) => [A,B,C,C] + notify', function() {
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👍

We'll need a test for removing the tail from a negative index

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added that, you could take another shot when you have time, thanks

@hjdivad hjdivad mentioned this pull request Jul 17, 2017
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hjdivad
hjdivad approved these changes Jul 17, 2017
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LGTM

packages/ember-runtime/tests/suites/mutable_array/replace.js
@@ -126,6 +126,27 @@ suite.test('[A,B,C,D].replace(2,2) => [A,B] + notify', function() {
equal(observer.validate('firstObject'), false, 'should NOT have notified firstObject once');
});

suite.test('[A,B,C,D].replace(-1,1) => [A,B,C] + notify', function() {
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👍

packages/ember-runtime/lib/mixins/array.js
let delta = addedAmount - removedAmount;
let previousLength = length - delta;

let normalStartIdx = startIdx < 0 ? previousLength + startIdx : startIdx;
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👍

@stefanpenner
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@krisselden bugfix beta or let it ride the canary train?

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chatted with @krisselden hes ok with beta

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@bekzod can you squash, and prefix with [BUGFIX beta] ?

@bekzod bekzod changed the title fix for lastObject/firstObject update issue [BUGFIX beta] fix for lastObject/firstObject update issue Jul 18, 2017
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bekzod commented Jul 18, 2017

@stefanpenner done

@locks locks merged commit 23a8c92 into emberjs:master Jul 18, 2017
@bekzod bekzod deleted the array-first-last-object branch July 18, 2017 06:22
@stefanpenner stefanpenner mentioned this pull request Jul 19, 2017
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@bekzod bekzod mentioned this pull request Mar 25, 2018
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@stefanpenner stefanpenner stefanpenner approved these changes

@hjdivad hjdivad hjdivad approved these changes

@krisselden krisselden krisselden approved these changes

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@bekzod @stefanpenner @hjdivad @krisselden @locks