Resolve "Add batch number, program and updated from to application export"

Closes #65 (closed)

src/main/java/nl/tudelft/tam/cache/CourseCacheManager.java

@@ -18,7 +18,6 @@
 package nl.tudelft.tam.cache;
 
 import java.util.List;
-import java.util.stream.Collectors;
 
 import nl.tudelft.labracore.api.CourseControllerApi;
 import nl.tudelft.labracore.api.dto.CourseDetailsDTO;
@@ -36,7 +35,7 @@ public class CourseCacheManager extends CoreCacheManager<Long, CourseDetailsDTO>
 
 	@Override
 	protected List<CourseDetailsDTO> fetch(List<Long> ids) {
-		return ids.stream().map(id -> api.getCourseById(id).block()).collect(Collectors.toList());
+		return api.getAllCoursesById(ids).collectList().block();
 	}
 
 	@Override