I’m at the Ruby Hoedown in Huntsville this weekend. Being around so many brilliant geeks encouraged me to release a gem I’ve had sitting in the hopper for several weeks.
finder_filter encapsulates a pattern I find myself using quite frequently in Rails. Namely, looking up an instance variable before an action. For example:
class UsersController < ActionController::Base before_filter :find_user, :only => [:show, :edit] def show # do something with @user end def edit # do something with @user end def find_user @user = User.find(params[:id) end end
Sticking the finder in a before filter keeps the code DRY, but it still takes several lines to do this. finder_filter reduces this to a single line of code:
class UsersController < ActionController::Base finder_filter :only => [:show, :edit] def show; end def edit; end end
There are other options to customize the column and param used in the lookup. Check out the README for full details.
To install the gem as a plugin in your Rails project:
sudo gem install pelargir-finder_filter --source=http://gems.github.com
environment.rb in your Rails app and add the gem as a dependency in your initializer block:
Rails::Initializer.run do |config| config.gem "pelargir-finder_filter" ... end
If you have any comments or suggestions, I’d love to hear from you. Contact me through the finder_filter project on GitHub.
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params.match(/id$/).each do |k,v|
the_model_name = (k.to_sym == :id) ? self.class.model_name : k.to_s.gsub(/_id/, '')
rescue NoMethodError, NameError
Been using this for a while. Just set it as a before filter in application controller. It always does the right thing.