I have a current need for allowing both admin configurable global settings as well as per-user configurable settings within a Rails 3 app.
Are there any gems or best practices that work well for this situation?
I've found a couple of gems and blog posts but they all date back to 2006-08 and are no longer maintained. Any pointers would be appreciated, thanks.
Note: I have seen this question with the serialised hash response but in my particular case the ability to query the database for users based on their settings is required - I don't think a serialized hash would work well in that situation.
As always right after asking for help my search bears fruit. Found Georg Ledermann's fork of rails-settings that looks like it will do just what I need.
Not sure I would look for a library for this function.
For global settings, I would create a config/application.yml file and read it in environment.rb and set it to an APP_CONFIG global. Then, I would override those settings on a per-user basis by adding a text column to the user table with json-encoded settings hash. Add a method to the user model that grabs APP_CONFIG and does a deep merge on the decoded user settings.
Another option would be to create a settings table, with a user_id column, and columns for each setting. One row with a null user_id would represent global settings. If a row exists for the current user, any non-nil values would override the global settings row.
May also want to look at https://github.com/railsjedi/rails_config. Amongst it's many features:
- Global settings.yml
- Per-environment settings files (settings/development.yml, settings/production.yml etc.)
- Local settings files (settings.local.yml, settings/development.local.yml, etc. )
- Embedded ERB support
- Rails 3 / Padrino / Sinatra support
For rails 4, if you are using postgresql, you can use HStore, which is just like a serializable attribute, but you do SQL queries with it.
For rails 3, you can use activerecord-postgres-hstore gem.
来源：https://stackoverflow.com/questions/4306412/rails-3-application-user-settings-best-practice