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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.

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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];
    }
}
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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;
    }
});
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