Handy

Handy is a simple Django app that provides the user with a working, if simple, search rank algorithm matching maintenance experts with the properties they've maintained. Handy starts with an initial dataset provided from a CSV file.

Installation

This script requires Python3 and Sqlite.

1. Create a new virtual environment:

   $ virtualenv --python=python3 handy $ cd handy $ source bin/activate ;# this is the bash instruction; use what your env demands $ pip install django $ git clone handy $ cd handy ;# Yes, twice: handy/handy. $ rm db.sqlite3 $ ./manage.py migrate auth admin sessions $ ./manage.py migrate ranksearch 0001_initial $ ./manage.py recoverhandy $ ./manage.py runserver

"Recoverhandy" is a custom command that imports the CSV into the database, creating owners, properties, maintainers, and jobs progressively. It does a lot of 'get_or_create' commands, so on SQLite it's pretty slow.

After entering the 'handy' app home, you can also

$ ./manage.py test

This will run a simple unit test that asserts both the database structure and client status are adequate.

Process

The first thing is to understand the data.

The problem:

• A maintainer starts with a score
• For the problem space, the score is artificial
• A rating is given to a maintainer on a given date
• More precisely: The maintainer gets a set of scores in order
• The maintainer's overall score is:
• score when there are zero jobs
• score + (sum ratings / 10) between 1 and 9 jobs
• (sum ratings / num sits) for 10 o more jobs

Tables: Property Owners Properties (owner_id) Maintainers Jobs (maintainer_id, property_id, start_date, end_date, rating, comments)

I'm big on slugs. I'm very big on navigable and bookmarkable URLs. If a property owner comes to like a particular maintainer, that maintainer should have their own URL the owner can always navigate to, to see if the maintainer is available.

I know it's bad form to write your own pagination kit, but I couldn't help myself; it's a bit of showing off, especially with the history thing in-lined.

Analysis

This was fun. I haven't worked in Django in almost three years, and the things that have changed since 1.4 and within Python 3 make development even more interesting than usual.

Postscript

If you're reading this and you can't figure out what this is really for, you probably don't need it.