class_docstr: MongoDB TaskRecord backend.
class_docstr_tok: ["MongoDB","TaskRecord","backend","."]
docstr: get all msg_ids, ordered by time submitted.
docstr_tok: ["get","all","msg_ids",",","ordered","by","time","submitted","."]
code: def get_history(self):
      """get all msg_ids, ordered by time submitted."""
      cursor = self._records.find({}, {"msg_id": 1}).sort("submitted")
      return [rec["msg_id"] for rec in cursor]
  
file_path: ipyparallel/ipyparallel/controller/mongodb.py
imports: from traitlets import Dict, Instance, List, Unicode
  from .dictdb import BaseDB
label_desc: Use image node_id 9 for calling the MongoDB obj's underlying member method code with example usage: obj.get_history() and returns: unknown