code: func (m *Manager) GetByID(iyoid string) (*Identifier, error) {
  	var idObj Identifier
  
  	if err := m.getIdentifierCollection().Find(bson.M{"iyoids": iyoid}).One(&idObj); err != nil {
  		return nil, err
  	}
  
  	return &idObj, nil
  }
docs: // GetByID returns the full identifier object for this iyoid