added validaton for assigning users to events

backend/pkg/db/availabilities/availabilities.go

@@ -4,8 +4,10 @@ import (
 	"github.com/johannesbuehl/golunteer/backend/pkg/db"
 )
 
+type AvailabilityID int
+
 type AvailabilityDB struct {
-	AvailabilityID int `db:"availabilityID" json:"availabilityID" validate:"required"`
+	AvailabilityID AvailabilityID `db:"availabilityID" json:"availabilityID" validate:"required"`
 	Availability   `validate:"required"`
 }
 
@@ -38,12 +40,12 @@ func Slice() ([]AvailabilityDB, error) {
 	}
 }
 
-func Keys() (map[int]Availability, error) {
+func Keys() (map[AvailabilityID]Availability, error) {
 	if availabilitiesRaw, err := Slice(); err != nil {
 		return nil, err
 	} else {
 		// convert the result in a map
-		availabilities := map[int]Availability{}
+		availabilities := map[AvailabilityID]Availability{}
 
 		for _, a := range availabilitiesRaw {
 			availabilities[a.AvailabilityID] = Availability{

backend/pkg/db/events/events.go

@@ -235,6 +235,18 @@ func WithAvailabilities() ([]EventWithAvailabilities, error) {
 	}
 }
 
+func GetUserAvailability(eventID int, userName string) (*availabilities.AvailabilityID, error) {
+	var availabilityID struct {
+		AvailabilityID *availabilities.AvailabilityID `db:"availabilityID"`
+	}
+
+	if err := db.DB.QueryRowx("SELECT availabilityID FROM USER_AVAILABILITIES WHERE eventID = $1 AND userName = $2", eventID, userName).StructScan(&availabilityID); err != nil {
+		return availabilityID.AvailabilityID, err
+	} else {
+		return availabilityID.AvailabilityID, nil
+	}
+}
+
 func WithUserAvailability(userName string) ([]EventWithAssignmentsUserAvailability, error) {
 	var events []EventWithAssignmentsUserAvailability
 
@@ -325,7 +337,7 @@ func User(userName string) ([]EventWithAssignments, error) {
 }
 
 // set the availability of an user for a specific event
-func UserAvailability(eventID, availabilityID int, userName string) error {
+func SetUserAvailability(eventID, availabilityID int, userName string) error {
 	_, err := db.DB.Exec("INSERT INTO USER_AVAILABILITIES (userName, eventID, availabilityID) VALUES ($1, $2, $3) ON CONFLICT (userName, eventID) DO UPDATE SET availabilityID = $3", userName, eventID, availabilityID)
 
 	return err