Passing array name as parameters in mongoose

Question

I'm using mongoose and I'm doing an update of my db by using findByIdAndUpdate() function. I'd like to push elements into different arrays present in my document. I have in my document different array with different names. May I pass as parameter the name array to this function or I should create different function where every function has a different nameArray?

  this.findByIdAndUpdate(User._id,
                        {$push:{nameArray: 'element'}}, 
                        {upsert: true},
                        callback);

JavaScript Object literals don't currently allow variables as keys. An identifier on left of the `:` will be taken for its name, so `"nameArray"` is the name of the property. Related: [How do I add a property to a Javascript Object using a variable as the name?](http://stackoverflow.com/questions/695050) and related to [Is this Javascript object literal key restriction strictly due to parsing?](http://stackoverflow.com/questions/2873163) — Jonathan Lonowski, Aug 24 '14 at 19:40
Though, for future reference, current ECMAScript 6 drafts have defined a *ComputedPropertyName* syntax for Object initializers -- `{ [nameArray]: 'element' }`. — Jonathan Lonowski, Aug 24 '14 at 19:42

JohnnyHK · Accepted Answer · 2015-10-16T00:40:54.443

In Node.js 4.x you can use the computed property syntax to do this directly in the $push object literal:

this.findByIdAndUpdate(User._id,
                       {$push: {[nameArray]: 'element'}}, 
                       {upsert: true},
                       callback);

In previous versions, you need to build your $push object programmatically:

var push = {};
push[nameArray] = 'element';
this.findByIdAndUpdate(User._id,
                       {$push: push}, 
                       {upsert: true},
                       callback);

Passing array name as parameters in mongoose

1 Answers1