code: func (o *InvitationManager) GetByEmail(email string) ([]JoinOrganizationInvitation, error) {
  	orgRequests := []JoinOrganizationInvitation{}
  	err := o.collection.Find(bson.M{"emailaddress": email}).All(&orgRequests)
  	return orgRequests, err
  }
docs: // GetByEmail gets all invitations for an email address.