Coding with Clay
Coding with Clay
Kevin Mahoney
Personal blog of Kevin Mahoney
Latest posts
Focustro: Development Notes for a Replicating React Application
Focustro: Development Notes for a Replicating React Application
Files That Change Together Should Stick Together
Files That Change Together Should Stick Together
Effective Checklists
Effective Checklists
Alerts, Checklists, and Lazy Thinking
Alerts, Checklists, and Lazy Thinking
Accidental Waterfall
Accidental Waterfall
The State-Diff Pattern
The State-Diff Pattern My Googling couldn’t discover an existing name for this pattern, so I have taken the liberty of naming it myself. I’ll update if I find one already in use. The state-diff pattern transforms an imperative interface into a declarative one, allowing the client to write pure, easily testable functions to describe the desired state of a system. This desired state is then compared…
Applying “Make Invalid States Unrepresentable”
Applying “Make Invalid States Unrepresentable” Here are some real life cases of applying one of my favourite principles . I’ll try to update this as I come across good examples. Case 1: Contiguous Time Periods A straightforward way to represent a period of time is by its start and end dates ( (Date, Date) ): If we need to represent a timeline split in to contiguous periods, it may be tempting to…
My Principles for Building Software
My Principles for Building Software
The High Cost of Splitting Related Data
The High Cost of Splitting Related Data
Your Database as an API
Your Database as an API
Sense and Availability
Sense and Availability
A Few Django ORM Mistakes
A Few Django ORM Mistakes See if you can figure out what's wrong with the code snippets below! Ask yourself what the problem is, what effect will it have, and how can you fix it? These examples are for Django, but probably apply to many other ORMs. Bug 1 def create (): with transaction . atomic (): thing = Thing . objects . create ( foo = 1 , bar = 1 ) set_foo ( thing . id ) thing . bar = 2 thing…
Consistency is Consistently Undervalued
Consistency is Consistently Undervalued
Database Design: Heterogeneous Collections
Heterogeneous Collections