Setup dev environment

Clone the repository
Install docker & docker-compose
Run: docker-compose up -d
Run: docker-compose exec superset ./docker-init.sh to initialize sample data & permissions
Access web interface: http://localhost:8088

Customize frontend (React JS)

Frontend source location: superset-frontend/src, for example jsx file for Welcome page is located at superset-frontend/src/welcome
Run npm watch: docker-compose exec superset-node "cd /app/superset-frontend && npm run dev" (for automatically rebuild the source when we make changes)
Do the customization, wait for node server to rebuild and then reload web to see the result ;)

Build production docker image

Clone Amancevice superset repository: https://github.com/amancevice/docker-superset
Change repository url to our's in Dockerfile
Run: make (to supervise the build of the new image)
Run push new image to docker hub and pull to our production server, re-run production superset container and we're done

Add new jinja_context python function (ex: current_merchant_id)

define new function to superset/jinja_context.py
add the new function name to self.context block in def init() function

Customize Backend (Python Flask Framework)

List all app routes

docker-compose exec superset flask routes

Application structure

app.py -> register api (views/$model/api.py) -> superset/models

Steps to add, customize api

Migrate DB
Define/Customize model in superset/models extend Model
Define/Customize api extends BaseOwnedModelRestApi, specify datamodel to the model in prev step
Define api resource_name (for routes), class_permission_name (for Sec), col list
Register newly created Api class to app.py

Security

Ref to https://flask-appbuilder.readthedocs.io/en/latest/security.html