Redmine

I'm developing a new plugin that will need a "settings" view.

On that view I'll need to make a couple drop-downs; things like the Project List and the Custom Field for project lists.

If I was developing a normal app, I would just update the Settings controller and add a @pictures and @custom_fields instance variables on a before_filter. But since this is a custom app

I've tried monkeypatching SettingsController like this:

# vendor/plugins/my_plugin/app/controllers/SettingsController.rb

class SettingsController < ApplicationController
  before_filter :calculate_project_custom_fields, :only => :plugin

  private

  def calculate_project_custom_fields
    if params[:id] == 'my_plugin'
      @projects = Projects.all
      @project_custom_fields = CustomField.find_all_by_type('ProjectCustomField')
    end
  end
end

This allows me to reach the Settings page, where I've a form that uses Projects Projects and @project_custom_fields to modify settings (tags reference "settings[something][something]"). When I POST this form, however, I get the following error:

A copy of ApplicationController has been removed from the module tree but is still active!

I've googled this and found one reference saying that this could be solved by making SettingsController "unloadable" - but then I read that this was a deprecated method. And I wouldn't know how to make it unloadable anyway - so I'm stuck.

I guess I could calculate @pictures and @custom_fields directly in the view, but that sounds so un-rails-y.

What's the correct way to get Projects Projects and @project_custom_fields available for my view ?