[fishbook/dataset] fix constructor when passing the dataset_id

fishbook/fishbook.py

@@ -2,7 +2,7 @@ from .database.database import Cells, Datasets, CellDatasetMap, Subjects, Subjec
 import nixio as nix
 import os
 import numpy as np
-# from IPython import embed
+from IPython import embed
 
 
 def _safe_get_val(dictionary:dict, key, default=None):
@@ -98,7 +98,7 @@ class Dataset:
             pattern = "dataset_id like '{0:s}'".format(dataset_id)
             dsets = (Datasets & pattern)
             _results_check(dsets, dataset_id, "Dataset ID")
-            self.__tuple = dsets.fetch(limit=1)[0]
+            self.__tuple = dsets.fetch(limit=1, as_dict=True)[0]
         else:
             print("Empty dataset, not linked to any database entry!")
         if len(self.__tuple.keys()) > 0: