gistfile1.txt

let isPrimitive = function(value) {
  let primitiveTypes = [
    'number',
    'boolean',
    'string'
  ];

  return (primitiveTypes.indexOf(typeof value) !== -1) || util.isDate(value) || (value === null) || (value.constructor && (value.constructor.name === 'ObjectID'));
};

let convertToDotNotation = function(value, modelClass) {
  if (!value || isPrimitive(value)) {
    return value;
  }

  let obj = {};

  var flatten = function(parent, prefix, child) {
    if (!child) {
      return;
    }

    if (isPrimitive(child)) {
      if (!parent) {
        parent = {};
      }

      parent[prefix] = child;

      return;
    }

    let getPrefix = function(key) {
      if (!prefix) { return key; } else { return prefix + '.' + key; }
    };

    if (Array.isArray(child)) {
      child.forEach((c, index) => flatten(parent, getPrefix(index), c));
    } else {
      Object.keys(child).forEach(key => flatten(parent, getPrefix(key), child[key]));
    }

  };

  let { relations } = modelClass.model;

  Object.keys(relations).forEach(function(relationName) {
    let { embed, keyFrom } = relations[relationName];

    if (embed) {
      flatten(value, keyFrom, value[keyFrom]);
      return delete value[keyFrom];
    }});

  return value;
};