@transaction.atomic ignored?

[Lene Preuss]

Hi, 

I want to write a large number of model instances to DB, in a multi-database setup. The way I am doing this is essentially:

@transaction.atomic

def process_all():

    for record in Model.objects.using(DB1).all():

        process_one(record)

def process_one(record):

    do_something_with(record)

    record.save(using=DB2)

The way I understand the docs (https://docs.djangoproject.com/en/1.8/topics/db/transactions/#controlling-transactions-explicitly) this should start a transaction when process_all() is entered, and commit it when process_all() is finished - so all records should be written at once. However, this is not what happens - no transaction is started, and all records are written to DB immediately. 

Neither ATOMIC_REQUESTS nor AUTOCOMMIT are touched in the settings. FWIW, I use a Postgres DB and Django 1.7.8. Also, if I replace the @transactions.atomic decorator with: with transactions.atomic() do: ..., that doesn't change anything.

What am I missing?

Thanks, Lene

[Stephen J. Butler]

@transaction.atomic will only look at the default database. Since you're using multiple ones I think you want something like:

@transaction.atomic(using=DB1)

@transaction.atomic(using=DB2)

def process_all():

    # ....

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