I have a Ruby on Rails question:
I need a way to detect if the code is executing under a transaction.
So that I'll be able to enforce save only under transaction in some models.
Pacman,
what form of transaction are you trying to detect? Most items that will execute within a rails program can be monitored but the best bet would be to write test for the method/transaction so that you can create strick rules for what is going on. I would like to know a little more about what it is that you are trying to do so that I can give a little more in depth answer.
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What I'm trying to do is to make sure certain models are only ever saved inside a transaction.
So I wat to write a macro method such that I can do:
class Foo < ActiveRecrod::Base
require_transaction
end
And it will throw an exception if in before_save it detects that there's no transaction going. i.e.
@foo.save! # should fail
AnyOtherModelOrFoo.transaction do
@foo.save! # should work
Next stage will be detecting if the model is locked. i.e. if it was selected with :lock => true. But this is step 2 :-)
It seems like there isn't really a built-in way to do this. I hear a lot about how RoR isn't strong on transactions. However, this looks like kind of a jury-rigged workaround:
I found this here.
That's not it. the code you linked is just a quick hack intended to verify which transaction method gets called by setting a trace function and printing all the data on function calls when name contains word transaction and then running some ActiveRecord transaction code. The result: it's a class method
Okay … I completely misread that code. Sorry about that.
Looking at the ActiveRecord transaction docs I wonder if you couldn't check to see that the thread had fired start_db_transaction, as it appears to do so when the transaction is started. However the Transaction::Simple module has a method transaction_open? that looks like it could verify a transaction was currently open, using named transactions.
I must admit I don't do much with RoR, so if the above doesn't help I hope hornbeck can provide some insight. :)
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