mongoose-extract-duplicate-field

#Mongoose Extract Duplicate Field


_This simple module extracts the name of a duplicate field from the Mongoose "duplicate
key" error message object._

You can install it using npm:

``bash
npm install --save mongoose-extract-duplicate-field
`

The module exports a _function_. Once installed, you can import this function:


`javascript
var extractDuplicateField = require('mongoose-extract-duplicate-field');
`

And call it, like so:

`javascript
foo.save(function (error)
if (error && error.code === 11000) {
var field = extractDuplicateField(error);

}
});
`

The extractDuplicateField` function you imported extracts the name of the
duplicate field and returns it synchronously. Simple but useful stuff.