some progress

node_modules/mongoose/lib/helpers/timestamps/setupTimestamps.js

@@ -0,0 +1,106 @@
+'use strict';
+
+const applyTimestampsToChildren = require('../update/applyTimestampsToChildren');
+const applyTimestampsToUpdate = require('../update/applyTimestampsToUpdate');
+const get = require('../get');
+const handleTimestampOption = require('../schema/handleTimestampOption');
+const setDocumentTimestamps = require('./setDocumentTimestamps');
+const symbols = require('../../schema/symbols');
+
+const replaceOps = new Set([
+  'replaceOne',
+  'findOneAndReplace'
+]);
+
+module.exports = function setupTimestamps(schema, timestamps) {
+  const childHasTimestamp = schema.childSchemas.find(withTimestamp);
+  function withTimestamp(s) {
+    const ts = s.schema.options.timestamps;
+    return !!ts;
+  }
+
+  if (!timestamps && !childHasTimestamp) {
+    return;
+  }
+
+  const createdAt = handleTimestampOption(timestamps, 'createdAt');
+  const updatedAt = handleTimestampOption(timestamps, 'updatedAt');
+  const currentTime = timestamps != null && timestamps.hasOwnProperty('currentTime') ?
+    timestamps.currentTime :
+    null;
+  const schemaAdditions = {};
+
+  schema.$timestamps = { createdAt: createdAt, updatedAt: updatedAt };
+
+  if (createdAt && !schema.paths[createdAt]) {
+    const baseImmutableCreatedAt = schema.base != null ? schema.base.get('timestamps.createdAt.immutable') : null;
+    const immutable = baseImmutableCreatedAt != null ? baseImmutableCreatedAt : true;
+    schemaAdditions[createdAt] = { [schema.options.typeKey || 'type']: Date, immutable };
+  }
+
+  if (updatedAt && !schema.paths[updatedAt]) {
+    schemaAdditions[updatedAt] = Date;
+  }
+
+  schema.add(schemaAdditions);
+
+  schema.pre('save', function timestampsPreSave(next) {
+    const timestampOption = get(this, '$__.saveOptions.timestamps');
+    if (timestampOption === false) {
+      return next();
+    }
+
+    setDocumentTimestamps(this, timestampOption, currentTime, createdAt, updatedAt);
+
+    next();
+  });
+
+  schema.methods.initializeTimestamps = function() {
+    const ts = currentTime != null ?
+      currentTime() :
+      this.constructor.base.now();
+    if (createdAt && !this.get(createdAt)) {
+      this.$set(createdAt, ts);
+    }
+    if (updatedAt && !this.get(updatedAt)) {
+      this.$set(updatedAt, ts);
+    }
+
+    if (this.$isSubdocument) {
+      return this;
+    }
+
+    const subdocs = this.$getAllSubdocs();
+    for (const subdoc of subdocs) {
+      if (subdoc.initializeTimestamps) {
+        subdoc.initializeTimestamps();
+      }
+    }
+
+    return this;
+  };
+
+  _setTimestampsOnUpdate[symbols.builtInMiddleware] = true;
+
+  const opts = { query: true, model: false };
+  schema.pre('findOneAndReplace', opts, _setTimestampsOnUpdate);
+  schema.pre('findOneAndUpdate', opts, _setTimestampsOnUpdate);
+  schema.pre('replaceOne', opts, _setTimestampsOnUpdate);
+  schema.pre('update', opts, _setTimestampsOnUpdate);
+  schema.pre('updateOne', opts, _setTimestampsOnUpdate);
+  schema.pre('updateMany', opts, _setTimestampsOnUpdate);
+
+  function _setTimestampsOnUpdate(next) {
+    const now = currentTime != null ?
+      currentTime() :
+      this.model.base.now();
+    // Replacing with null update should still trigger timestamps
+    if (replaceOps.has(this.op) && this.getUpdate() == null) {
+      this.setUpdate({});
+    }
+    applyTimestampsToUpdate(now, createdAt, updatedAt, this.getUpdate(),
+      this.options, this.schema);
+    applyTimestampsToChildren(now, this.getUpdate(), this.model.schema);
+    next();
+  }
+};