trackTransaction.js
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'use strict';
const arrayAtomicsSymbol = require('../helpers/symbols').arrayAtomicsSymbol;
const sessionNewDocuments = require('../helpers/symbols').sessionNewDocuments;
module.exports = function trackTransaction(schema) {
schema.pre('save', function() {
const session = this.$session();
if (session == null) {
return;
}
if (session.transaction == null || session[sessionNewDocuments] == null) {
return;
}
if (!session[sessionNewDocuments].has(this)) {
const initialState = {};
if (this.isNew) {
initialState.isNew = true;
}
if (this.$__schema.options.versionKey) {
initialState.versionKey = this.get(this.$__schema.options.versionKey);
}
initialState.modifiedPaths = new Set(Object.keys(this.$__.activePaths.states.modify));
initialState.atomics = _getAtomics(this);
session[sessionNewDocuments].set(this, initialState);
} else {
const state = session[sessionNewDocuments].get(this);
for (const path of Object.keys(this.$__.activePaths.states.modify)) {
state.modifiedPaths.add(path);
}
state.atomics = _getAtomics(this, state.atomics);
}
});
};
function _getAtomics(doc, previous) {
const pathToAtomics = new Map();
previous = previous || new Map();
const pathsToCheck = Object.keys(doc.$__.activePaths.init).concat(Object.keys(doc.$__.activePaths.modify));
for (const path of pathsToCheck) {
const val = doc.$__getValue(path);
if (val != null &&
val instanceof Array &&
val.isMongooseDocumentArray &&
val.length &&
val[arrayAtomicsSymbol] != null &&
Object.keys(val[arrayAtomicsSymbol]).length > 0) {
const existing = previous.get(path) || {};
pathToAtomics.set(path, mergeAtomics(existing, val[arrayAtomicsSymbol]));
}
}
const dirty = doc.$__dirty();
for (const dirt of dirty) {
const path = dirt.path;
const val = dirt.value;
if (val != null && val[arrayAtomicsSymbol] != null && Object.keys(val[arrayAtomicsSymbol]).length > 0) {
const existing = previous.get(path) || {};
pathToAtomics.set(path, mergeAtomics(existing, val[arrayAtomicsSymbol]));
}
}
return pathToAtomics;
}
function mergeAtomics(destination, source) {
destination = destination || {};
if (source.$pullAll != null) {
destination.$pullAll = (destination.$pullAll || []).concat(source.$pullAll);
}
if (source.$push != null) {
destination.$push = destination.$push || {};
destination.$push.$each = (destination.$push.$each || []).concat(source.$push.$each);
}
if (source.$addToSet != null) {
destination.$addToSet = (destination.$addToSet || []).concat(source.$addToSet);
}
if (source.$set != null) {
destination.$set = Object.assign(destination.$set || {}, source.$set);
}
return destination;
}