flow like the river

VISUALIZACION/node_modules/mongoose/lib/schema/DocumentArrayElement.js

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+/*!
+ * Module dependencies.
+ */
+
+'use strict';
+
+const MongooseError = require('../error/mongooseError');
+const SchemaType = require('../schematype');
+const SubdocumentPath = require('./SubdocumentPath');
+const getConstructor = require('../helpers/discriminator/getConstructor');
+
+/**
+ * DocumentArrayElement SchemaType constructor.
+ *
+ * @param {String} path
+ * @param {Object} options
+ * @inherits SchemaType
+ * @api public
+ */
+
+function DocumentArrayElement(path, options) {
+  this.$parentSchemaType = options && options.$parentSchemaType;
+  if (!this.$parentSchemaType) {
+    throw new MongooseError('Cannot create DocumentArrayElement schematype without a parent');
+  }
+  delete options.$parentSchemaType;
+
+  SchemaType.call(this, path, options, 'DocumentArrayElement');
+
+  this.$isMongooseDocumentArrayElement = true;
+}
+
+/**
+ * This schema type's name, to defend against minifiers that mangle
+ * function names.
+ *
+ * @api public
+ */
+DocumentArrayElement.schemaName = 'DocumentArrayElement';
+
+DocumentArrayElement.defaultOptions = {};
+
+/*!
+ * Inherits from SchemaType.
+ */
+DocumentArrayElement.prototype = Object.create(SchemaType.prototype);
+DocumentArrayElement.prototype.constructor = DocumentArrayElement;
+
+/**
+ * Casts `val` for DocumentArrayElement.
+ *
+ * @param {Object} value to cast
+ * @api private
+ */
+
+DocumentArrayElement.prototype.cast = function(...args) {
+  return this.$parentSchemaType.cast(...args)[0];
+};
+
+/**
+ * Casts contents for queries.
+ *
+ * @param {String} $cond
+ * @param {any} [val]
+ * @api private
+ */
+
+DocumentArrayElement.prototype.doValidate = function(value, fn, scope, options) {
+  const Constructor = getConstructor(this.caster, value);
+
+  if (value && !(value instanceof Constructor)) {
+    value = new Constructor(value, scope, null, null, options && options.index != null ? options.index : null);
+  }
+
+  return SubdocumentPath.prototype.doValidate.call(this, value, fn, scope, options);
+};
+
+/**
+ * Clone the current SchemaType
+ *
+ * @return {DocumentArrayElement} The cloned instance
+ * @api private
+ */
+
+DocumentArrayElement.prototype.clone = function() {
+  this.options.$parentSchemaType = this.$parentSchemaType;
+  const ret = SchemaType.prototype.clone.apply(this, arguments);
+  delete this.options.$parentSchemaType;
+
+  ret.caster = this.caster;
+  ret.schema = this.schema;
+
+  return ret;
+};
+
+/*!
+ * Module exports.
+ */
+
+module.exports = DocumentArrayElement;