Nested values copies from one object to another

Question

Here is a nodejs code that copies values from one object (submitted from a firm) to a model object.

Model:

var directory_model = {
 "link_title": {
 "value": 1, // This needs to be filled with object data
 "validation": null
 },
 "link_desc": {
 "value": 2, // This needs to be filled with object data
 "validation": null
 },
};

Object values that must get into the model:

 { link_title: 'test1', link_desc: 'test2' }

Here is the code that does, it with lodash. This code does the job:

_.forOwn(directory_model, function(directory_model_value, directory_model_key) {
 _.forOwn(fields, function(fields_value, fields_key) {
 "use strict";
 if (directory_model_key === fields_key) {
 directory_model[directory_model_key].value = fields_value;
 }
 });
});

I don't like the nested loop, and would like to know if you know another way to do this. I found several ways, but none of them works, because of the nested properties.

Answer 1

Why bother with libraries? This doesn't need anything more than pure JS. Assuming the incoming data is stored in fields:

var keys = Object.keys(fields);
for(var i = 0; i < keys.length; i++) {
 var key = keys[i];
 if(directory_model[key]) {
 directory_model[key].value = fields[key];
 }
}

Answer 2

I am not 100% sure what you are trying to achieve.

If you are not sure that your fields (form i guess) contains only keys that exist in directory_model, I recommend assigning the values in one iteration, with a simple check:

_.forOwn(fields, function (fields_value, fields_key) {
 if (directory_model[fields_key]) {
 directory_model[fields_key].value = fields_value;
 }
});