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feat: proof of concept for using proxies to track changes on arrays
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| 'use strict'; | ||
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| /*! | ||
| * Module dependencies. | ||
| */ | ||
|
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| const ArrayMethods = require('../array/methods'); | ||
| const DocumentArrayMethods = require('./methods'); | ||
| const Document = require('../../document'); | ||
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| const arrayAtomicsSymbol = require('../../helpers/symbols').arrayAtomicsSymbol; | ||
| const arrayAtomicsBackupSymbol = require('../../helpers/symbols').arrayAtomicsBackupSymbol; | ||
| const arrayParentSymbol = require('../../helpers/symbols').arrayParentSymbol; | ||
| const arrayPathSymbol = require('../../helpers/symbols').arrayPathSymbol; | ||
| const arraySchemaSymbol = require('../../helpers/symbols').arraySchemaSymbol; | ||
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| const _basePush = Array.prototype.push; | ||
|
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| /** | ||
| * DocumentArray constructor | ||
| * | ||
| * @param {Array} values | ||
| * @param {String} path the path to this array | ||
| * @param {Document} doc parent document | ||
| * @api private | ||
| * @return {MongooseDocumentArray} | ||
| * @inherits MongooseArray | ||
| * @see http://bit.ly/f6CnZU | ||
| */ | ||
|
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| function MongooseDocumentArray(values, path, doc) { | ||
| const arr = []; | ||
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| const internals = { | ||
| [arrayAtomicsSymbol]: {}, | ||
| [arrayAtomicsBackupSymbol]: void 0, | ||
| [arrayPathSymbol]: path, | ||
| [arraySchemaSymbol]: void 0, | ||
| [arrayParentSymbol]: void 0 | ||
| }; | ||
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| if (Array.isArray(values)) { | ||
| if (values[arrayPathSymbol] === path && | ||
| values[arrayParentSymbol] === doc) { | ||
| internals[arrayAtomicsSymbol] = Object.assign({}, values[arrayAtomicsSymbol]); | ||
| } | ||
| values.forEach(v => { | ||
| _basePush.call(arr, v); | ||
| }); | ||
| } | ||
| internals[arrayPathSymbol] = path; | ||
|
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| // Because doc comes from the context of another function, doc === global | ||
| // can happen if there was a null somewhere up the chain (see #3020 && #3034) | ||
| // RB Jun 17, 2015 updated to check for presence of expected paths instead | ||
| // to make more proof against unusual node environments | ||
| if (doc && doc instanceof Document) { | ||
| internals[arrayParentSymbol] = doc; | ||
| internals[arraySchemaSymbol] = doc.schema.path(path); | ||
|
|
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| // `schema.path()` doesn't drill into nested arrays properly yet, see | ||
| // gh-6398, gh-6602. This is a workaround because nested arrays are | ||
| // always plain non-document arrays, so once you get to a document array | ||
| // nesting is done. Matryoshka code. | ||
| while (internals[arraySchemaSymbol] != null && | ||
| internals[arraySchemaSymbol].$isMongooseArray && | ||
| !internals[arraySchemaSymbol].$isMongooseDocumentArray) { | ||
| internals[arraySchemaSymbol] = internals[arraySchemaSymbol].casterConstructor; | ||
| } | ||
| } | ||
|
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| const proxy = new Proxy(arr, { | ||
| get: function(target, prop) { | ||
| if (prop === 'isMongooseArray' || | ||
| prop === 'isMongooseArrayProxy' || | ||
| prop === 'isMongooseDocumentArray' || | ||
| prop === 'isMongooseDocumentArrayProxy') { | ||
| return true; | ||
| } | ||
| if (prop === '__array') { | ||
| return arr; | ||
| } | ||
| if (prop === 'set') { | ||
| return set; | ||
| } | ||
| if (internals.hasOwnProperty(prop)) { | ||
| return internals[prop]; | ||
| } | ||
| if (DocumentArrayMethods.hasOwnProperty(prop)) { | ||
| return DocumentArrayMethods[prop]; | ||
| } | ||
| if (ArrayMethods.hasOwnProperty(prop)) { | ||
| return ArrayMethods[prop]; | ||
| } | ||
|
|
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| return arr[prop]; | ||
| }, | ||
| set: function(target, prop, value) { | ||
| if (typeof prop === 'string' && /^\d+$/.test(prop)) { | ||
| set.call(proxy, prop, value); | ||
| } else if (internals.hasOwnProperty(prop)) { | ||
| internals[prop] = value; | ||
| } else { | ||
| arr[prop] = value; | ||
| } | ||
|
|
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| return true; | ||
| } | ||
| }); | ||
|
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| return proxy; | ||
| } | ||
|
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| function set(i, val, skipModified) { | ||
| const arr = this.__array; | ||
| if (skipModified) { | ||
| arr[i] = val; | ||
| return arr; | ||
| } | ||
| const value = DocumentArrayMethods._cast.call(this, val, i); | ||
| arr[i] = value; | ||
| DocumentArrayMethods._markModified.call(this, i); | ||
| return arr; | ||
| } | ||
|
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| /*! | ||
| * Module exports. | ||
| */ | ||
|
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| module.exports = MongooseDocumentArray; |
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