Posts with tag yaml

Manipulating database.yml

This is the second in a series of posts on building powerful and resilient Rails application templates. In the previous post, we discussed parsing and emitting YAML files with comments. Today, we will be looking at manipulating the database.yml file’s AST.

Parsing and emitting database.yml

Recently, I have been working on Rails application templates. These are scripts that can be run with rails new to enhance or extend the setup of a new Rails application with a specific configuration. They can also be ran against existing Rails applications using rails app:template. So, they are a powerful tool for automating certain kinds of configuration, modification, and setup tasks. But, there are also many limitations and stumbling blocks to what you can do with them.

In this series, I will be sharing some of the things I have learned while working on these scripts. This post is about the difficulty of manipulating the database.yml file. Let’s jump into it.