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[Solved] TransactionManagement “You can’t execute queries until the end of the ‘atomic’ block” while using signals, but only during Unit Testing

Hello Guys, How are you all? Hope You all Are Fine. Today I get the following error TransactionManagement “You can’t execute queries until the end of the ‘atomic’ block” while using signals, but only during Unit Testing in python. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How TransactionManagement “You can’t execute queries until the end of the ‘atomic’ block” while using signals, but only during Unit Testing Error Occurs?

Today I get the following error TransactionManagement “You can’t execute queries until the end of the ‘atomic’ block” while using signals, but only during Unit Testing in python.

How To SolveTransactionManagement “You can’t execute queries until the end of the ‘atomic’ block” while using signals, but only during Unit Testing Error ?

  1. How To SolveTransactionManagement “You can't execute queries until the end of the 'atomic' block” while using signals, but only during Unit Testing Error ?

    To SolveTransactionManagement “You can't execute queries until the end of the 'atomic' block” while using signals, but only during Unit Testing Error That will prevent the purposefully-thrown exception from breaking the entire unittest's transaction.

  2. TransactionManagement “You can't execute queries until the end of the 'atomic' block” while using signals, but only during Unit Testing

    To SolveTransactionManagement “You can't execute queries until the end of the 'atomic' block” while using signals, but only during Unit Testing Error That will prevent the purposefully-thrown exception from breaking the entire unittest's transaction.

Solution 1


I ran into this same problem myself. This is caused by a quirk in how transactions are handled in the newer versions of Django coupled with a unittest that intentionally triggers an exception.

I had a unittest that checked to make sure a unique column constraint was enforced by purposefully triggering an IntegrityError exception:

def test_constraint(self):
    try:
        # Duplicates should be prevented.
        models.Question.objects.create(domain=self.domain, slug='barks')
        self.fail('Duplicate question allowed.')
    except IntegrityError:
        pass

    do_more_model_stuff()

In Django 1.4, this works fine. However, in Django 1.5/1.6, each test is wrapped in a transaction, so if an exception occurs, it breaks the transaction until you explicitly roll it back. Therefore, any further ORM operations in that transaction, such as my do_more_model_stuff(), will fail with that django.db.transaction.TransactionManagementError exception.

Like caio mentioned in the comments, the solution is to capture your exception with transaction.atomic like:

from django.db import transaction
def test_constraint(self):
    try:
        # Duplicates should be prevented.
        with transaction.atomic():
            models.Question.objects.create(domain=self.domain, slug='barks')
        self.fail('Duplicate question allowed.')
    except IntegrityError:
        pass

That will prevent the purposefully-thrown exception from breaking the entire unittest’s transaction.

Solution 2

I have the same issue, but with transaction.atomic() and TransactionTestCase didn’t work for me.

python manage.py test -r instead of python manage.py test is ok for me, maybe the order of execution is crucial

then i find a doc about Order in which tests are executed, It mentions which test will run first.

So, i use TestCase for database interaction, unittest.TestCase for other simple test, it works now!

Summery

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you? Thank You.

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