code: def fetch_model_data(model_querysets, model_ids_to_fetch):
      
      return {
          model: id_dict(model_querysets[model].filter(id__in=ids_to_fetch))
          for model, ids_to_fetch in model_ids_to_fetch.items()
      }
docs: Given a dictionary of models to querysets and model IDs to models, fetch the IDs
      for every model and return the objects in the following structure.
  
      {
          model: {
              id: obj,
              ...
          },
          ...
      }