fix room deletion

src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/controller/RoomController.java

@@ -23,6 +23,12 @@ public class RoomController {
 
     @Autowired private DeviceRepository<Device> deviceRepository;
 
+    @Autowired private SwitchRepository switchRepository;
+
+    @Autowired private ButtonDimmerRepository buttonDimmerRepository;
+
+    @Autowired private KnobDimmerRepository knobDimmerRepository;
+
     @GetMapping
     public List<Room> findAll() {
         return toList(roomRepository.findAll());
@@ -81,6 +87,9 @@ public class RoomController {
 
     @DeleteMapping("/{id}")
     public void deleteById(@PathVariable("id") long id) {
+        switchRepository.deleteAllByRoomId(id);
+        knobDimmerRepository.deleteAllByRoomId(id);
+        buttonDimmerRepository.deleteAllByRoomId(id);
         roomRepository.deleteById(id);
     }
 

src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/ButtonDimmerRepository.java

@@ -1,3 +1,9 @@
 package ch.usi.inf.sa4.sanmarinoes.smarthut.models;
 
-public interface ButtonDimmerRepository extends DeviceRepository<ButtonDimmer> {}
+import javax.transaction.Transactional;
+
+public interface ButtonDimmerRepository extends DeviceRepository<ButtonDimmer> {
+
+    @Transactional
+    void deleteAllByRoomId(long roomId);
+}

src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/KnobDimmerRepository.java

@@ -1,3 +1,9 @@
 package ch.usi.inf.sa4.sanmarinoes.smarthut.models;
 
-public interface KnobDimmerRepository extends DeviceRepository<KnobDimmer> {}
+import javax.transaction.Transactional;
+
+public interface KnobDimmerRepository extends DeviceRepository<KnobDimmer> {
+
+    @Transactional
+    void deleteAllByRoomId(long roomId);
+}

src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/Switch.java

@@ -54,7 +54,7 @@ public class Switch extends InputDevice {
     }
 
     @PreRemove
-    private void removeSwitchable() {
+    public void removeSwitchable() {
         for (Switchable s : getOutputs()) {
             s.setSwitchId(null);
         }

src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/SwitchRepository.java

@@ -1,3 +1,9 @@
 package ch.usi.inf.sa4.sanmarinoes.smarthut.models;
 
-public interface SwitchRepository extends DeviceRepository<Switch> {}
+import javax.transaction.Transactional;
+
+public interface SwitchRepository extends DeviceRepository<Switch> {
+
+    @Transactional
+    void deleteAllByRoomId(long roomId);
+}