Specifying Readonly access for Django.db connection object
<p>I have a series of integration-level tests that are being run as a management command in my Django project. These tests are verifying the integrity of a large amount of weather data ingested from external sources into my database. Because I have such a large amount of data, I really have to test against my production database for the tests to be meaningful. What I'm trying to figure out is how I can define a read-only database connection that is specific to that command or connection object. I should also add that these tests can't go through the ORM, so I need to execute raw SQL. </p>

<p>The structure of my test looks like this</p>

<pre><code>class Command(BaseCommand):
    help = 'Runs Integration Tests and Query Tests against Prod Database'

    def handle(self,*args, **options):
        suite = unittest.TestLoader().loadTestsFromTestCase(TestWeatherModel)
        ret = unittest.TextTestRunner().run(suite)
        if(len(ret.failures) != 0):
            sys.exit(1)
        else:
            sys.exit(0)

class TestWeatherModel(unittest.TestCase):
    def testCollectWeatherDataHist(self):
        wm = WeatherManager()
        wm.CollectWeatherData()
        self.assertTrue(wm.weatherData is not None)
</code></pre>

<p>And the WeatherManager.CollectWeatherData() method would look like this:</p>

<pre><code>def CollecWeatherData(self):
    cur = connection.cursor()
    cur.execute(&lt;Raw SQL Query&gt;)
    wm.WeatherData = cur.fetchall()
    cur.close()
</code></pre>

<p>I want to somehow idiot-proof this, so that someone else (or me) can't come along later and accidentally write a test that would modify the production database.</p>

<p>If you add a serializer for you model, you could specialized in the serializer that is working in readonly mode</p>

<pre><code>class AccountSerializer(serializers.ModelSerializer):
    class Meta:
        model = Account
        fields = ('id', 'account_name', 'users', 'created')
        read_only_fields = ('account_name',)
</code></pre>

<p>from <a href="http://www.django-rest-framework.org/api-guide/serializers/#specifying-read-only-fields" rel="nofollow">http://www.django-rest-framework.org/api-guide/serializers/#specifying-read-only-fields</a></p>

python django django-testing django-database django-postgresql