ruby

Some time ago I decided to move all my audio episodes from Soundcloud to [Transistor](https://transistor.fm/). I wanted something that didn't cost too much, that I could still include in the Jekyll page and that would help a bit with publishing to whatever audience was reached.

Once a team has a stable and trusted way to get releases deployed quickly and potentially multiple times during a day it becomes very useful to have a way to switch features or changes ON and OFF in the production environment.

When it comes to doing SQL queries onto a relational database there is a time when this query needs to use rows from two tables to give you the rows you want. These are called “join” queries. Their purpose is to combines records from two tables, let's see how that can end up.

Often with RubyOnRails (and other Ruby frameworks) we rely on instance variables and the or-equals operator (||=) to store some expensive data in memory to avoid costly database or API queries : this is called memoization.