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Using ActiveRecord to Abstract “Greatest N Per Group” Queries

My approach allowed me to specify the group based on a set of columns and to abstract the required join logic behind an ActiveRecord scope.

Ruby on Rails •

September 21, 2012

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Ruby on Rails

Using ActiveRecord to Abstract “Greatest N Per Group” Queries

My approach allowed me to specify the group based on a set of columns and to abstract the required join logic behind an ActiveRecord scope.

Developer Tools

Using Thor to Build a Command Line Interface

Here's a simple command line interface (created in Thor) that provides grep-like functionality around Ruby's regular expression functionality.

Development Practices

Embedded Developers Aren’t Special

We can make embedded software better if we take testing more seriously, avoid optimization until it's necessary, write more abstract code, and stop believing we're special.

Development Practices

Some Tweaks for C Development to Help with TDD

Advice to help developers use test driven development more effectively in the language C.

Embedded Systems

Using text.parsec.indent to Parse an Indentation-Sensitive Language with Haskell’s Parsec Library

An example of using Text.Parsec.Indent to parse an indentation-sensitive language in Haskell using Parsec.

Embedded Systems

Avoid Putting Preprocessor Directives in .c Files

Embedded Systems

Taking the Training Wheels off the Arduino

The Arduino C Scaffold is a project environment for stepping outside the Arduino IDE and into the land of embedded C programming.

Embedded Systems

Incidental Code Coverage: TDD as a Solution

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John Van Enk

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