title: how to use the bulk_create() for many objects to do the save() operation
body: <p>I have a lot of objects to save to the database, the code as below:</p>
  
  <pre><code>def addSthGroups(groups):
      for group in groups:  # each group is an object
          group.addSth()
          group.save()
  </code></pre>
  
  <p>and right now, it takes much time to save all of the object one by one. So my Question is: Is there a more efficient method to collect all of objects to just call the save() once, it may speed up the processing time, as I know, bulk_create sounds good to handle this scenario, can anyone give an example for this code? or any other good suggestion?</p>