Some ruby code

1. U WONT BLEEV WUT DIS
CODE DOEZ

2. IN DA BEGINNIN ALL WUZ NICE

3. DEN ROGUE ERROR APPEARD
#{l(@order.purchased_at, format: :order_date)}
ActionView::Template::Error
Object must be a Date, DateTime or Time
object. nil given.
SILLY PUPPY, PURCHASD AT SHUD NOT
BE NIL

4. HER LIEZ TEH PROBLEM
@order.purchased_at = Time.current
@order.confirm!
send_notifications

6. HOW CAN PURCHASD AT BE NIL?

7. TURNS OUT SOMEBODY WUZ SMART

8. THAR SHUD NOT BE 2 KITTEHS
PURCHASIN AT TEH SAME TIEM

9. @order.with_lock do
add_errors_from(confirmer_command) unless
confirmer_command.perform
end

10. AN TEH CEILIN KAT SED
Locking::Pessimistic provides support for row-
level locking using SELECT … FOR UPDATE

11. I KNOE HOW DAT WERKZ
t1 select … for update
t2 select … for update
t1 purchased_at = Time.zone.now
send_notifications
t2 select … for update returns

12. AN TEH CEILIN KAT SED
You can start a transaction and acquire the lock
in one go by calling with_lock with a block.

13. WUT DOEZ SEND_NOTIFICATIONS
DO
def send_notifications
Resque.enqueue(...)
end

14. transaction
+
Resque.enqueue

16. TEH FIX WUZ EASY
@order.with_lock do
check_pending_order!
@order.purchased_at = Time.current
@order.confirm!
end
send_notifications

17. DOAN MAK KITTEHS SAD
LOCK ONLY WUT ABSOLUTELY NECESARY
READ UP ON HOW THINGS WERK