Make sure that claimed time slots are sorted

Signed-off-by: Cedric Willekens <c.s.willekens@student.tudelft.nl>

src/main/java/nl/tudelft/ewi/walkytalky/controller/UnitController.java

@@ -21,6 +21,7 @@ package nl.tudelft.ewi.walkytalky.controller;
 
 import java.time.LocalDate;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -210,6 +211,7 @@ public class UnitController {
 		Unit unit = unitRepository.findById(id).orElseThrow();
 		List<ClaimedTimeSlot> claimedTimeSlots = claimedTimeSlotRepository
 				.findAllByUnitOnOrAfterDate(unit, LocalDate.now());
+		Collections.sort(claimedTimeSlots);
 
 		model.addAttribute("slots", claimedTimeSlots);
 		model.addAttribute("unit", unit);

src/main/java/nl/tudelft/ewi/walkytalky/model/ClaimedTimeSlot.java

@@ -39,7 +39,7 @@ import lombok.NoArgsConstructor;
 @AllArgsConstructor
 @NoArgsConstructor
 @Entity
-public class ClaimedTimeSlot {
+public class ClaimedTimeSlot implements Comparable<ClaimedTimeSlot>{
 	@Id
 	@GeneratedValue
 	private Long id;
@@ -87,4 +87,9 @@ public class ClaimedTimeSlot {
 	public int hashCode() {
 		return Objects.hash(getId());
 	}
+
+	@Override
+	public int compareTo(ClaimedTimeSlot claimedTimeSlot) {
+		return this.slot.start().compareTo(claimedTimeSlot.getSlot().start());
+	}
 }