How can I iterate through all of the Models in my rails app?

Question

I would like to be able to iterate over and inspect all the models in my rails app. In pseudo-code it would look something like:

rails_env.models.each do |model|         


        

Answer 1

Rails Admin uses this code (see https://github.com/sferik/rails_admin/blob/master/lib/rails_admin/config.rb, method viable_models):

([Rails.application] + Rails::Engine.subclasses.collect(&:instance)).flat_map do |app|
          (app.paths['app/models'].to_a + app.config.autoload_paths).collect do |load_path|
            Dir.glob(app.root.join(load_path)).collect do |load_dir|
              Dir.glob(load_dir + '/**/*.rb').collect do |filename|
                # app/models/module/class.rb => module/class.rb => module/class => Module::Class
                lchomp(filename, "#{app.root.join(load_dir)}/").chomp('.rb').camelize
              end
            end
          end
        end.flatten.reject { |m| m.starts_with?('Concerns::') }

The advantage being that it loads models in associated engines, not just in your current app.