javascript - Compund index which overwrites previous document -

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I am trying to create a model for MongoDb to use Mongoos where I want to make sure that There is only one document present and file for a particular user. 

  var filestama memory = new Mongoose Sema ({file: mongoose.Schema.Type.ObjectId, user: mojo.edema.type objectID, hasin: {type: boolean, default: while trying to save a document with a combination of file, file} and user A duplicate key error that precedes it is.  
 Is there any way by which I can configure MongoDB to overwrite the document instead of raising an exception?   
 
 
 If the document is not present, then this command will create a new  
  collection.update ({file: 2112, user: 21421}, {Hassin: true}, {upside down: true});

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