I'm creating an ActiveRecord object A and want to update object B during
the process even if the creation of object A is rolled back due to a
before_create callback returning false.
Is there a way for me to do this?
It seems that once you're in the ActiveRecord callback chain your DB
updates will be rolled back unless the entire callback chain returns
true.
Another way to look at this: I need to track all ActiveRecord "create"
attempts but it seems that I'm unable to use callbacks or observers to
do this since both are referenced within the ActiveRecord callback
chain.
I’m creating an ActiveRecord object A and want to update object B during
the process even if the creation of object A is rolled back due to a
before_create callback returning false.
Is there a way for me to do this?
It seems that once you’re in the ActiveRecord callback chain your DB
updates will be rolled back unless the entire callback chain returns
true.
Another way to look at this: I need to track all ActiveRecord “create”
attempts but it seems that I’m unable to use callbacks or observers to
do this since both are referenced within the ActiveRecord callback
chain.
How would you go about doing this?
I wouldn’t claim that this is a good idea (and I expect it would violate most peoples expectations about all aspects of the save rolling back if a callback returns false but…
Database connections and hence transactions happen on a per thread basis, therefore if you create a separate thread and create B it is created using a separate database connection and won’t be affected by the rollback of the main save. This could be quite simple:
Thread.new do
B.create
end.join
Will run that second thread and wait until it exits before continuing. Watch out for cross thread exception handling and make sure that B.create isn’t going to do anything thread dangerous.
