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perf: speed up creating maps of subdocuments #13280

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merged 6 commits into from
Apr 27, 2023
Merged

perf: speed up creating maps of subdocuments #13280

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4f22223
perf(document): avoid some unnecessary work when checking if map path…
vkarpov15 Apr 16, 2023
51b8982
perf(document): fix build, avoid unnecessary Object.keys() re: #13191
vkarpov15 Apr 16, 2023
7bec506
perf(map): delay string concatenation unless necessary
vkarpov15 Apr 16, 2023
e6eec87
test: fix tests re: #13191
vkarpov15 Apr 16, 2023
96890ec
chore: add benchmark for #13191
vkarpov15 Apr 18, 2023
b9ca7ca
fix: use Object.prototype.hasOwnProperty re: code review
vkarpov15 Apr 18, 2023
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17 changes: 12 additions & 5 deletions lib/document.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2217,19 +2217,26 @@ Document.prototype[documentModifiedPaths] = Document.prototype.modifiedPaths;

Document.prototype.isModified = function(paths, modifiedPaths) {
if (paths) {
const directModifiedPaths = Object.keys(this.$__.activePaths.getStatePaths('modify'));
if (directModifiedPaths.length === 0) {
return false;
}

if (!Array.isArray(paths)) {
paths = paths.indexOf(' ') === -1 ? [paths] : paths.split(' ');
}

const directModifiedPathsObj = this.$__.activePaths.states.modify;
if (directModifiedPathsObj == null) {
return false;
}
for (const path of paths) {
if (directModifiedPathsObj.hasOwnProperty(path)) {
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return true;
}
}

const modified = modifiedPaths || this[documentModifiedPaths]();
const isModifiedChild = paths.some(function(path) {
return !!~modified.indexOf(path);
});

const directModifiedPaths = Object.keys(directModifiedPathsObj);
return isModifiedChild || paths.some(function(path) {
return directModifiedPaths.some(function(mod) {
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return mod === path || path.startsWith(mod + '.');
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Maybe just calling startsWith is more ergonomic than making the direct comparison.
Or maybe store path length in a variable and then do someting like

return mod.length === pathLength && mod === path || mod.length > pathLength && mod[pathLength] === "." && path.startsWith(mod)

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If we do this we would need to put it into a for loop. We could theoretically do directly a for of loop of Object.keys as Object.keys returns an iterator and it should not make a perf difference.

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Not a bad idea, but I'd like to do some additional benchmarking to see if this makes a meaningful difference. We'll keep #13191 open for future work related to this.

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36 changes: 25 additions & 11 deletions lib/types/map.js
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Expand Up @@ -96,9 +96,10 @@ class MongooseMap extends Map {
return;
}

const fullPath = this.$__path + '.' + key;
const populated = this.$__parent != null && this.$__parent.$__ ?
this.$__parent.$populated(fullPath, true) || this.$__parent.$populated(this.$__path, true) :
let _fullPath;
const parent = this.$__parent;
const populated = parent != null && parent.$__ && parent.$__.populated ?
parent.$populated(fullPath.call(this), true) || parent.$populated(this.$__path, true) :
null;
const priorVal = this.get(key);

Expand Down Expand Up @@ -127,11 +128,19 @@ class MongooseMap extends Map {
}
} else {
try {
value = this.$__schemaType.
applySetters(value, this.$__parent, false, this.get(key), { path: fullPath });
const options = this.$__schemaType.$isMongooseDocumentArray || this.$__schemaType.$isSingleNested ?
{ path: fullPath.call(this) } :
null;
value = this.$__schemaType.applySetters(
value,
this.$__parent,
false,
this.get(key),
options
);
} catch (error) {
if (this.$__parent != null && this.$__parent.$__ != null) {
this.$__parent.invalidate(fullPath, error);
this.$__parent.invalidate(fullPath.call(this), error);
return;
}
throw error;
Expand All @@ -140,13 +149,18 @@ class MongooseMap extends Map {

super.set(key, value);

if (value != null && value.$isSingleNested) {
value.$basePath = this.$__path + '.' + key;
if (parent != null && parent.$__ != null && !deepEqual(value, priorVal)) {
parent.markModified(fullPath.call(this));
}

const parent = this.$__parent;
if (parent != null && parent.$__ != null && !deepEqual(value, priorVal)) {
parent.markModified(this.$__path + '.' + key);
// Delay calculating full path unless absolutely necessary, because string
// concatenation is a bottleneck re: #13171
function fullPath() {
if (_fullPath) {
return _fullPath;
}
_fullPath = this.$__path + '.' + key;
return _fullPath;
}
}

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1 change: 1 addition & 0 deletions test/types.map.test.js
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Expand Up @@ -956,6 +956,7 @@ describe('Map', function() {
});
doc.myMap.set('abc', { myValue: 'some value' });
const changes = doc.getChanges();

assert.ok(!changes.$unset);
assert.deepEqual(changes, { $set: { 'myMap.abc': { myValue: 'some value' } } });
});
Expand Down