document.js

/**
 * Marks the path as having pending changes to write to the db.
 *
 * _Very helpful when using [Mixed](./schematypes.html#mixed) types._
 *
 * ####Example:
 *
 *     doc.mixed.type = 'changed';
 *     doc.markModified('mixed.type');
 *     doc.save() // changes to mixed.type are now persisted
 *
 * @param {String} path the path to mark modified
 * @param {Document} [scope] the scope to run validators with
 * @api public
 */

Document.prototype.markModified = function(path, scope) {
  this.$__.activePaths.modify(path);
  if (scope != null && !this.ownerDocument) {
    this.$__.pathsToScopes[path] = scope;
  }
};