return background sorted by order_index column

CHANGELOG

 minerva (16.0.0~beta.2) stable; urgency=medium
+  * Bug fix: correct background order for old projects restored (#1533)
   * Bug fix: search chemicals by target returned chemicals not bounded by
     disease (#1535)
   * Bug fix: problem with export map with submaps fixed (#1540)

rest-api/src/main/java/lcsb/mapviewer/api/projects/ProjectRestImpl.java

@@ -38,6 +38,14 @@ import lcsb.mapviewer.model.user.User;
 import lcsb.mapviewer.persist.dao.ProjectDao;
 import lcsb.mapviewer.persist.dao.cache.UploadedFileEntryDao;
 import lcsb.mapviewer.persist.dao.map.species.ElementProperty;
+import lcsb.mapviewer.services.ObjectExistsException;
+import lcsb.mapviewer.services.ObjectNotFoundException;
+import lcsb.mapviewer.services.QueryException;
+import lcsb.mapviewer.services.interfaces.IElementService;
+import lcsb.mapviewer.services.interfaces.IProjectBackgroundService;
+import lcsb.mapviewer.services.interfaces.IProjectService;
+import lcsb.mapviewer.services.interfaces.IReactionService;
+import lcsb.mapviewer.services.interfaces.IUserService;
 import lcsb.mapviewer.services.*;
 import lcsb.mapviewer.services.interfaces.*;
 import lcsb.mapviewer.services.utils.CreateProjectParams;
@@ -77,6 +85,8 @@ public class ProjectRestImpl extends BaseRestImpl {
 
   private ProjectDao projectDao;
 
+  private IProjectBackgroundService projectBackgroundService;
+
   private UploadedFileEntryDao uploadedFileEntryDao;
 
   public ProjectRestImpl(IProjectService projectService,
@@ -85,11 +95,14 @@ public class ProjectRestImpl extends BaseRestImpl {
       IUserService userService,
       MeSHParser meshParser,
       IElementService elementService,
-      IReactionService reactionService) {
+      IProjectBackgroundService projectBackgroundService,
+      IReactionService reactionService,
+      ServletContext context) {
     this.projectService = projectService;
     this.projectDao = projectDao;
     this.meshParser = meshParser;
     this.userService = userService;
+    this.projectBackgroundService = projectBackgroundService;
     this.uploadedFileEntryDao = uploadedFileEntryDao;
     this.elementService = elementService;
     this.reactionService = reactionService;
@@ -758,10 +771,8 @@ public class ProjectRestImpl extends BaseRestImpl {
   }
 
   public List<ProjectBackground> getBackgrounds(String projectId) throws ObjectNotFoundException {
-    List<ProjectBackground> result = getProjectByProjectId(projectId).getProjectBackgrounds();
-    for (ProjectBackground projectBackground : result) {
-      Hibernate.initialize(projectBackground.getProjectBackgroundImageLayer());
-    }
+    List<ProjectBackground> result = projectBackgroundService.getProjectBackgroundsByProject(getProjectByProjectId(projectId));
+    result.sort(ProjectBackground.ORDER_COMPARATOR);
     return result;
   }