Django

[raunak-r]

Django General Framework

Learning

• https://gist.github.com/raunak-r/5139cb9d5a40977e0f4650a2764071bb

Custom Commands

• https://simpleisbetterthancomplex.com/tutorial/2018/08/27/how-to-create-custom-django-management-commands.html

URL Framework

• https://www.webforefront.com/django/regexpdjangourls.html

Further Reading

• A million requests per second with Python

[raunak-r]

Working with Data in Django

Django ORM

• https://books.agiliq.com/projects/django-orm-cookbook/en/latest/index.html
• on_delete attribute
• Include & Exclude

Creating Data

• Dumpdata & LoadData

Migrations

• Resetting Migrations

Using Inbuilt Django Models

• User Model

Notes

If blank=True then the field will not be required, whereas if it's False the field cannot be blank.
The exception is CharFields and TextFields, which in Django are never saved as NULL. Blank values are stored in the DB as an empty string ('')
CHAR and TEXT types are never saved as NULL by Django, so null=True is unnecessary.

Optimizations

https://medium.com/better-programming/django-select-related-and-prefetch-related-f23043fd635d

[raunak-r]

Integrating Tools with Django

Using Databases

• Postgres with Django

Celery

Short Readme on integrating Redis and Celery with Django - #19 (comment)
List of all files - https://gist.github.com/raunak-r/bdc622e22b985d5b4bb0c15914272596

Flower Integration

• https://flower.readthedocs.io/en/latest/install.html#usage
• https://ordinarycoders.com/blog/article/django-celery-flower

• Flower does not process tasks. You must run both, then Flower can be used as a monitoring tool.
  Run celery:

celery -A tasks worker --loglevel=info
Open another shell and run flower:
celery -A tasks flower --loglevel=info

Others

• Celery and RabbitMQ
• https://adamj.eu/tech/2021/01/20/efficient-reloading-in-djangos-runserver-with-watchman/?fbclid=IwAR3gra9VwrQ6kSg7h8WOkr-XV93k1UX9r50ziqkWolN9xWUCrLLbzBYLvVA

Scaling Celery

-Using seperate queues - https://blog.codeparrot.ai/how-we-scaled-celery-for-our-django-app-da2465a3a6be

• Problems with Redis - Long running jobs redelivering after broker visibility timeout with celery and redis celery/celery#5935

[raunak-r]

Django ORM Objects

• Django Taggit Tags to Serializers

Model Inheritance to create new Models

• Explanation using a Content & Video Models
• Types of Model Inheritance

Foreign Keys

• Multiple Foreign Keys from 1 table to another same table
• (https://stackoverflow.com/questions/583327/django-model-with-2-foreign-keys-from-the-same-table)

[raunak-r]

Django - Angular Serving as a Single Page

• Serving Angular inside Django

• Middlewares, Storage Location etc - django-spa Documentation

• Writing the URL
  ex . path('', serve, {settings.APP_DIR: 'index.html'})

Checklist

1. Packages
2. Middleware
   GETTING THE PATH FROM ANGULAR.JSON projects.architect.build.options.
3. STATICFILES_STORAGE = 'spa.storage.SPAStaticFilesStorage'
   STATIC_URL, STATIC_ROOT, FRONTEND_APP_DIR
4. STATICFILES_DIRS = [ (os.path.join(ANGULAR_APP_DIR)), ]
5. Add URL

[raunak-r]

Django - CORS | CSRF | HTTPS

• Adding CORS

• What is mixed content. http and https mixed in angular websites. - https://www.howtogeek.com/443032/what-is-mixed-content-and-why-is-chrome-blocking-it/

• mixed content calling http from https angular or vice-versa - https://stackoverflow.com/questions/18321032/how-to-get-chrome-to-allow-mixed-content)

[raunak-r]

Django - Admin

django-admin-cookbook

[raunak-r]

Cleaning | Efficiency | Maintainability

https://dev.to/djangodoctor/48-of-django-projects-could-simplify-models-py-in-these-3-ways-1anc?fbclid=IwAR3FCAm-r4Ksg0yDa8RNEgu7PLRH22hH2bolktZochtt_x2BNcDKE1Fw150

[raunak-r]

Async Django

https://www.simplecto.com/djang-async-task-postgres-not-kafka-celery-redis/?fbclid=IwAR1gD3UQL1XxD0UAqfnUhyiK3ytqaMMBvJjvmLrCv9Cuj_EGzIklm3nBPws

[raunak-r]

Production | Deployment

• Best Practices - https://www.facebook.com/notes/django-python-web-framework/django-deployment/792337874150794
• Debug False - https://gist.github.com/raunak-r/6d69e2cfdf18b4751397bc38f9c96691

Aws, S3, RDS, CI-CD

• https://valentine.click/blog/django-full-ci-cd-flow-to-aws-with-github-actions?fbclid=IwAR3m8kg1KtV0j2PjqO_LozwnW1nFZLpMScprWxFnr8gVaoO6h7bi01VzOjM

Scaling

• https://www.limechat.ai/blog/scaling-django-server-celery-workers

Scaling Celery

• https://lokesh1729.com/posts/scaling-celery-to-handle-workflows-and-multiple-queues/

[raunak-r]

Testing

https://vedantsopinions.medium.com/test-driven-development-like-a-boss-e17679a2ed72

[raunak-r]

Metrics

• add a request id to each log line - https://github.com/dabapps/django-log-request-id

[raunak-r]

Socket Programming

• Sending data from BE to FE. https://devarea.com/angular-and-django-websockets-communication/#.X5R1vKlN00N