Dynamic Configuration Setting

rubyonrails-talk
1

I would like to have a global configuration setting (an interest rate) that's settable by the administrator, but would be used in calculations throughout the app. I'm OK with setting up a single-field, single-value database table, and an A/R model.

However, is there a pattern for ensuring that there is always one and only one record in the table?

Thanks, Cliffe

2

I don't like people to touch the database. The pattern we follow is.

There is a config/application.yml.example in svn with those kind of external configuration parameters which are specific for this application. The install process says you copy that file to config/application.yml and change the defaults from the example.

Then in config/environemnt.rb we load it in a global hash:

# Load application configuration constants require 'yaml' APPLICATION_CONFIG = YAML::load(File.open(File.join(RAILS_ROOT, 'config', 'application.yml')))