Django, how to make a view atomic?
Wrap the DB queries that read and the ones that update in a transaction. The syntax depends on what ORM you are using.
I have a simple django app to simulate a stock market, users come in and buy/sell. When they choose to trade, 

the market price is read, and
based on the buy/sell order the market price is increased/decreased.

I'm not sure how this works in django, but is there a way to make the view atomic? i.e. I'm concerned that user A's actions may read the price but before it's updated because of his order, user B's action reads the price.
Couldn't find a simple, clean solution for this online. Thanks.