My work on adding bulk_update() to Django has been merged and will be released in Django 2.2! Like my filtered aggregates feature it relies heavily on the wonderfully versatile CASE statement to achieve some pretty good speedups for certain use-cases.
The development documentation gives a pretty clear example as to why it’s useful, but I’ll expand on it below a bit.
The problem A not-so uncommon use case in Django is iterating through some models, changing a field and saving the results back to the database.