Polymorphic association in Ecto (Part I)

By Shulhi Sapli on

Polymorphic association in database is when you have multiple tables that need to refer to the same table. For example, I have table users that contains details like profile information. I then have two tables, guards and operators which both have profile information. I need to link that to users…

Piping (|>) to second argument in Elixir

By Shulhi Sapli on

Pipe operator in Elixir is great, you can compose your functions naturally. However, there are times when you want to pipe the input to the second argument. How would you do that? Desugar iex> sum_number = fn x, y -> x - y end iex> sum_number.…

Multi-tenancy with Ecto, Part 1

By Shulhi Sapli on

With Ecto 2.0, there is support for Postgres schema or multiple databases for MySQL. What I am trying to do here is to use Postgres schema to achieve multi-tenancy, and of course using Ecto. Disclaimer: This is mostly for my personal notes as I try to understand Ecto/Elixir…

Django multi tenant issues with Celery + Postgres

By Shulhi Sapli on

You can quickly build a multi-tenant site in Django with the help of this nifty package django-tenant-schemas [https://github.com/bernardopires/django-tenant-schemas]. It works by assigning each tenant into its own database schema and having one public schema for anything that needs to be shared. It wraps Django's…

Class based Celery task

By Shulhi Sapli in python on

In the previous post, I showed you how to implement basic Celery task that make use of @task decorator and some pattern on how to remove circular dependencies when calling the task from Flask view. Let's recall some part of the code. def run_task_async(): task = chain(…

Celery integration with Flask

By Shulhi Sapli in celery on

As of Celery version 3.0 and above, Celery integration with Flask should no longer need to depend on third party extension. That's what they said. However, my experience integrating Celery with Flask especially when using Flask with blueprints shows that it can be a little bit tricky.…