Here is the situation:
req.session.user = doc[0];
req.session.user.password = null;
This results in doc[0].password = null!
How can I avoid this from happening?
Edit: Assuming that
doc[0] = { name: 'sangram', e-mail: 'abc.in', password : 'pwd' }To achieve this, you can replicate all properties of an object:
req.session.user = {};
for (var key in user) {
if (key !== 'password') req.session.user[key] = user[key];
}
If the user object is a mongoose document, it's recommended to first convert it to a plain object:
req.session.user = {};
var json = user.toObject();
for (var key in json) {
if (key !== 'password') req.session.user[key] = json[key];
}
Alternatively, using a helpful library like underscore or lodash can simplify the process:
req.session.user = _.omit(user.toObject(), 'password');
To handle basic scenarios involving simple objects, a compact helper function was created:
function CloneObject(obj) {
var duplicate = {};
for (var prop in obj)
duplicate[prop] = obj[prop];
return duplicate;
}
Here's how you can use it in your specific situation:
req.session.user = CloneObject(doc[0]);
req.session.user.password = null; //does not impact the password in doc[0]
Check out the live test case here. (using a sample object)
For future reference, I suggest updating or revising your question.
Looking for the best method to deep clone objects in JavaScript? Wondering about the correct way to clone a JavaScript object?
An insightful answer by Crockford can be found here
It is not possible to prevent this scenario. The user attribute is already set to the object doc[0]. Subsequently, when you modify the .password attribute of this newly assigned object, it will affect the original object as well. To segregate the password, you must assign a different object to doc[0].
req.session.user = {};
req.session.user.doc = doc[0];
req.session.user.password = null;
Below is a function for duplicating/extending an object:
var duplicate = function() {
var process = function(target, source) {
for (var property in source) {
if (Object.prototype.hasOwnProperty.call(source, property)) {
target[property] = source[property];
}
}
return target;
};
var output = arguments[0];
for(var j=1; j<arguments.length; j++) {
output = process(output, arguments[j]);
}
return output;
};
An example of how to utilize the function:
var initial = { value: "hello" };
var copied = duplicate({}, initial, { newAttribute: "example"});
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