code: func InitModels() {
  	index := mgo.Index{
  		Key:    []string{"username", "globalid"},
  		Unique: true,
  	}
  
  	db.EnsureIndex(grantCollectionName, index)
  
  	index = mgo.Index{
  		Key: []string{"grants"},
  	}
  
  	db.EnsureIndex(grantCollectionName, index)
  
  	index = mgo.Index{
  		Key: []string{"grants", "globalid"},
  	}
  
  	db.EnsureIndex(grantCollectionName, index)
  }
docs: // InitModels initialize models in mongo, if required.