Adds the missing dishrating-FKs (#335)

* added part of the missing dishrating-fks

* fixed build-error

* linting fix

server/backend/migration/20240320000000.go

@@ -0,0 +1,52 @@
+package migration
+
+import (
+	"fmt"
+
+	"github.com/go-gormigrate/gormigrate/v2"
+	"gorm.io/gorm"
+)
+
+type missingFK struct {
+	fromTable  string
+	fromColumn string
+	toTable    string
+	toColumn   string
+}
+
+func missingDishFKs() []missingFK {
+	return []missingFK{
+		{"cafeteria_rating", "cafeteriaID", "cafeteria", "cafeteria"},
+		{"dish", "cafeteriaID", "cafeteria", "cafeteria"},
+		{"dish2dishflags", "dish", "dish", "dish"},
+		{"dish2dishflags", "flag", "dishflags", "flag"},
+		{"dish2mensa", "dish", "dish", "dish"},
+		{"dish2mensa", "mensa", "mensa", "mensa"},
+		{"dish_rating_tag", "parentRating", "dish_rating", "dishRating"},
+		{"dish_rating_tag", "tagID", "dish_rating_tag_option", "dishRatingTagOption"},
+		{"dish_to_dish_name_tag", "dishID", "dish", "dish"},
+		{"dishes_of_the_week", "dishID", "dish", "dish"},
+	}
+}
+
+// migrate20240320000000
+// made sure that all dish ratings are connected with FK-Relationships
+func migrate20240320000000() *gormigrate.Migration {
+	return &gormigrate.Migration{
+		ID: "20240320000000",
+		Migrate: func(tx *gorm.DB) error {
+			for _, fk := range missingDishFKs() {
+				tx.Exec(fmt.Sprintf("alter table `%s` add constraint %s_%s_%s_fk foreign key (`%s`) references `%s` (`%s`) on update cascade on delete cascade",
+					fk.fromTable, fk.fromTable, fk.toTable, fk.toColumn, fk.fromColumn, fk.toTable, fk.toColumn))
+			}
+			return nil
+		},
+		Rollback: func(tx *gorm.DB) error {
+			for _, fk := range missingDishFKs() {
+				tx.Exec(fmt.Sprintf("alter table `%s` drop foreign key %s_%s_%s_fk",
+					fk.fromTable, fk.fromTable, fk.toTable, fk.toColumn))
+			}
+			return nil
+		},
+	}
+}

server/backend/migration/migration.go

@@ -79,6 +79,7 @@ func manualMigrate(db *gorm.DB) error {
 		migrate20240317000000(),
 		migrate20240318000000(),
 		migrate20240319000000(),
+		migrate20240320000000(),
 		migrate20240327000000(),
 		migrate20240402000000(),
 		migrate20240405000000(),