django-ckc

's tools, utilities, etc. we use across projects for Django

installing

pip install django-ckc

# settings.py
INSTALLED_APPS = (
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.staticfiles",

    # ... add ckc
    "ckc",
)

tests

$ docker build -t django-ckc . && docker run django-ckc pytest

what's in this

SoftDeletableModel

Make your models have a deleted bool set when they are deleted instead of actuallying being deleted. Uses a model manager SoftDeleteModelManager to keep them hidden.

PrimaryKeyWriteSerializerReadField

A DRF field for writing via PK and reading via a serializer. Useful for when you want to connect 2 models together and immediately display to the user some useful information.

For example, if you had an Order model with LineItem objects pointing to it, it may be useful to create a new line item via order PK and return back the complete order with new totals and other calculations:

class LineItemUpdateSerializer(serializers.ModelSerializer):
    order = PrimaryKeyWriteSerializerReadField(
        queryset=Order.objects.all(),
        read_serializer=OrderDetailSerializer
    )
    
    class Meta:
        model = LineItem
        fields = ["id", "order", "product"]

POST data for adding product #123 to order #5 would look like

// REQUEST
{"order": 5, "product": 123}"}

// RESPONSE
{"order": {"total_amount": "$1,000.00"}, "product": 123}

DefaultCreatedByMixin for ModelSerializers

This will automatically set YourModel.created_by to request.user. To override which attribute the user is written to, add a user_field to your classes Meta information

class YourModel(models.Model):
    created_by = models.ForeignKey(User, on_delete=models.CASCADE)
        

class MySerializer(DefaultCreatedByMixin, ModelSerializer):
    class Meta:
        model = YourModel

DjangoGeoPointProvider

Helps generate geo points in Factory Boy factories.

# factories.py
class SomeLocationFactory(DjangoModelFactory):
    location = factory.Faker('geo_point', country_code='US')

    class Meta:
        model = SomeLocation

# test_whatever.py
from django.contrib.gis.geos import Point


class WhateverTest(TestCase):
    def test_something(self):
        SomeLocationFactory()  # random location
        SomeLocationFactory(location=Point(x=60, y=60))  # specified location

Slack logging

Get a Slack webhook URL and set SLACK_WEBHOOK_URL env var. You can also set DJANGO_SLACK_LOG_LEVEL with info, warning, etc.

Modify your Celery settings:

# Let our slack logger handle celery stuff
CELERY_WORKER_HIJACK_ROOT_LOGGER = False

Example LOGGING configuration that turns on Slack logging if SLACK_WEBHOOK_URL env var is found:

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'colored': {
            '()': 'colorlog.ColoredFormatter',
            'format': "%(log_color)s%(levelname)-8s%(reset)s %(white)s%(message)s",
        }
    },
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
            'formatter': 'colored',
        },
    },
    'loggers': {
        '': {
            'handlers': ['console'],
            'level': os.getenv('DJANGO_LOG_LEVEL', 'INFO'),
        },
        'django': {
            'handlers': ['console'],
            'level': os.getenv('DJANGO_LOG_LEVEL', 'INFO'),
            'propagate': False,
        }
    },
}

SLACK_WEBHOOK_URL = os.getenv('SLACK_WEBHOOK_URL', '')
if SLACK_WEBHOOK_URL:
    LOGGING['handlers']['slack'] = {
        'class': 'ckc.logging.CkcSlackHandler',
        'level': os.getenv('DJANGO_SLACK_LOG_LEVEL', 'ERROR'),
    }

    LOGGING['loggers']['django']['handlers'] = ['console', 'slack']
    LOGGING['loggers']['']['handlers'] = ['console', 'slack']

SnackbarError

A little helper that when raised returns a JSON response to the user with a snackbar message. This message is automatically rendered as a snackbar by Skeletor.

# views.py
from ckc.exceptions import SnackbarError


class TestExceptionsViewSet(APIView):
    def get(self, request, *args, **kwargs):
        # This will return {"snackbar_message": "Something went wrong"}
        raise SnackbarError("Something went wrong")

./manage.py commands

command	description
upload_file <source> <destination>	uses django-storages settings to upload a file