reverted partial client side back button logic, but also now tested / validated if somehow we are in a flat view and ask for entries and dont get all of them back, or we are in folder view and we try to go into a folder or back up a folder and we get no data as someone deleted it since we made the view, so then show appropriate client-side errors

files.py

@@ -313,7 +313,9 @@ def process_ids():
 
 
 ################################################################################
-# /get_dir_entries -> FIXME:
+# /get_dir_entries:
+# -> if back is false - returns list of eids inside this dir
+# -> if back is true - returns list of eids inside the parent of this dir
 ################################################################################
 @app.route("/get_dir_eids", methods=["POST"])
 @login_required
@@ -325,17 +327,24 @@ def get_dir_entries():
 
     # if we are going back, find the parent id and use that instead
     if back:
-        # find current dir
-        stmt=( select(EntryDirLink.dir_eid).filter(EntryDirLink.entry_id==dir_id) )
-        dir_id = db.session.execute(stmt).scalars().one_or_none()
         # get parent of this dir, to go back
         stmt=( select(EntryDirLink.dir_eid).filter(EntryDirLink.entry_id==dir_id) )
         dir_id = db.session.execute(stmt).scalars().one_or_none()
+        if not dir_id:
+            # return valid as false, we need to let user know this is not an empty dir, it does not exist
+            return jsonify( valid=False, entry_list=[] )
+
+    # Just double-check this is still in the DB, in case it got deleted since client made view
+    stmt=( select(Entry.id).where(Entry.id==dir_id) )
+    ent_id = db.session.execute(stmt).scalars().one_or_none()
+    if not ent_id:
+        # return valid as false, we need to let user know this is not an empty dir, it does not exist
+        return jsonify( valid=False, entry_list=[] )
 
     # get content of dir_id
     stmt=( select(Entry.id).join(EntryDirLink).filter(EntryDirLink.dir_eid==dir_id) )
     stmt=stmt.order_by(*order_map.get(noo) )
-    return jsonify( entry_list=db.session.execute(stmt).scalars().all() )
+    return jsonify( valid=True, entry_list=db.session.execute(stmt).scalars().all() )
 
 # get Face override details
 def getFOT():