getEmbeddedDiscriminatorPath.js
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'use strict';
const cleanPositionalOperators = require('../schema/cleanPositionalOperators');
const get = require('../get');
/*!
* Like `schema.path()`, except with a document, because impossible to
* determine path type without knowing the embedded discriminator key.
*/
module.exports = function getEmbeddedDiscriminatorPath(schema, update, filter, path) {
const parts = path.split('.');
let schematype = null;
let type = 'adhocOrUndefined';
filter = filter || {};
update = update || {};
for (let i = 0; i < parts.length; ++i) {
const subpath = cleanPositionalOperators(parts.slice(0, i + 1).join('.'));
schematype = schema.path(subpath);
if (schematype == null) {
continue;
}
type = schema.pathType(subpath);
if ((schematype.$isSingleNested || schematype.$isMongooseDocumentArrayElement) &&
schematype.schema.discriminators != null) {
const discriminators = schematype.schema.discriminators;
const key = get(schematype, 'schema.options.discriminatorKey');
const discriminatorValuePath = subpath + '.' + key;
const discriminatorFilterPath =
discriminatorValuePath.replace(/\.\d+\./, '.');
let discriminatorKey = null;
if (discriminatorValuePath in filter) {
discriminatorKey = filter[discriminatorValuePath];
}
if (discriminatorFilterPath in filter) {
discriminatorKey = filter[discriminatorFilterPath];
}
const wrapperPath = subpath.replace(/\.\d+$/, '');
if (schematype.$isMongooseDocumentArrayElement &&
get(filter[wrapperPath], '$elemMatch.' + key) != null) {
discriminatorKey = filter[wrapperPath].$elemMatch[key];
}
if (discriminatorValuePath in update) {
discriminatorKey = update[discriminatorValuePath];
}
if (discriminatorKey == null || discriminators[discriminatorKey] == null) {
continue;
}
const rest = parts.slice(i + 1).join('.');
schematype = discriminators[discriminatorKey].path(rest);
if (schematype != null) {
type = discriminators[discriminatorKey]._getPathType(rest);
break;
}
}
}
return { type: type, schematype: schematype };
};