working but bad solution of "transaction close on onsuccess callback ended" problem.

src/jio.storage/indexeddbstorage.js

@@ -303,8 +303,7 @@
   };
 
   IndexedDBStorage.prototype.getAttachment = function (id, name, options) {
-    var transaction,
-      type,
+    var type,
       start,
       end;
     if (options === undefined) {
@@ -312,48 +311,63 @@
     }
     return openIndexedDB(this)
       .push(function (db) {
-        transaction = openTransaction(db, ["attachment", "blob"], "readonly");
-        // XXX Should raise if key is not good
-        return handleGet(transaction.objectStore("attachment")
-                         .get(buildKeyPath([id, name])));
-      })
-      .push(function (attachment) {
-        var total_length = attachment.info.length,
-          i,
-          promise_list = [],
-          store = transaction.objectStore("blob"),
-          start_index,
-          end_index;
-
-        type = attachment.info.content_type;
-        start = options.start || 0;
-        end = options.end || total_length;
-        if (end > total_length) {
-          end = total_length;
-        }
-
-        if (start < 0 || end < 0) {
-          throw new jIO.util.jIOError("_start and _end must be positive",
-                                      400);
-        }
-        if (start > end) {
-          throw new jIO.util.jIOError("_start is greater than _end",
-                                      400);
-        }
-
-        start_index = Math.floor(start / UNITE);
-        end_index =  Math.floor(end / UNITE);
-        if (end % UNITE === 0) {
-          end_index -= 1;
-        }
-
-        for (i = start_index; i <= end_index; i += 1) {
-          promise_list.push(
-            handleGet(store.get(buildKeyPath([id,
-                                name, i])))
-          );
-        }
-        return RSVP.all(promise_list);
+        return new RSVP.Promise(function (resolve, reject) {
+          var transaction = openTransaction(db, ["attachment", "blob"],
+            "readonly"),
+            // XXX Should raise if key is not good
+            request = transaction.objectStore("attachment")
+            .get(buildKeyPath([id, name]));
+          request.onerror = function (error) {
+            transaction.abort();
+            reject(error);
+          };
+          request.onsuccess = function () {
+            var attachment = request.result,
+              total_length,
+              i,
+              promise_list = [],
+              store = transaction.objectStore("blob"),
+              start_index,
+              end_index;
+
+            if (!attachment) {
+              return reject(
+                new jIO.util.jIOError("Cannot find attachment", 404)
+              );
+            }
+
+            total_length = attachment.info.length;
+            type = attachment.info.content_type;
+            start = options.start || 0;
+            end = options.end || total_length;
+            if (end > total_length) {
+              end = total_length;
+            }
+
+            if (start < 0 || end < 0) {
+              throw new jIO.util.jIOError("_start and _end must be positive",
+                400);
+            }
+            if (start > end) {
+              throw new jIO.util.jIOError("_start is greater than _end",
+                400);
+            }
+
+            start_index = Math.floor(start / UNITE);
+            end_index =  Math.floor(end / UNITE);
+            if (end % UNITE === 0) {
+              end_index -= 1;
+            }
+
+            for (i = start_index; i <= end_index; i += 1) {
+              promise_list.push(
+                handleGet(store.get(buildKeyPath([id,
+                  name, i])))
+              );
+            }
+            resolve(RSVP.all(promise_list));
+          };
+        });
       })
       .push(function (result_list) {
         var array_buffer_list = [],
@@ -413,10 +427,12 @@
         }
 
         // Remove previous attachment
-        transaction = openTransaction(db, ["attachment", "blob"], "readwrite");
+        transaction = openTransaction(db, ["attachment", "blob"],
+          "readwrite", false);
         return removeAttachment(transaction, id, name);
       })
       .push(function () {
+        transaction = openTransaction(db, ["attachment", "blob"], "readwrite");
 
         var promise_list = [
             handleRequest(transaction.objectStore("attachment").put({