问题
Referring to the example in Django documentation for multiple databases in one application,
https://docs.djangoproject.com/en/dev/topics/db/multi-db/#an-example
" It also doesn’t consider the interaction of transactions with the database utilization strategy. "
How do I handle the interaction stated above.
The scenario is this:
I am using postgresql as my database. I have setup up a replica and want all the reads to "auth" tables to go to replica. Following the documentation I wrote a database router. Now whenever I try to log in to my application is throws the following error.
DatabaseError: cannot execute UPDATE in a read-only transaction.
This happens when Django tries to save the "last_login" time. Because, in the same view it first fetches the record from replica, and then tries to update the last_login time. Since it happens in one transaction so the same database is used, i.e. replica.
How do I handle this?
Thoughts?
来源：https://stackoverflow.com/questions/17169971/django-database-routing-with-transactions