User selected CSS stylesheet in Rails

I'm working on a site in Rails and I'd like for the user to be able to change the CSS stylesheet to either a light or dark theme.

I have this in my view so that I can use a variable for the stylesheet:

<%= stylesheet_link_tag @current_stylesheet %>

I tried to change that variable by having a link in my view something like this:

<%= link_to 'Light Theme', :action => "set_light", :id => @projects %>

that calls this function in my Controller:

class ProjectsController < ApplicationController
  def set_light
    @current_stylesheet = 'light'
  end
end

Is there a way to make something like this work? Right now it says that the projects/set_light template is missing, but I don't want to make new templa开发者_Python百科tes, I'd just like to call set_light to change the stylesheet and refresh the current page. Any ideas on how to accomplish this, or maybe a better way to approach it?

---

to avoid having rails look for a 'set_light' template you can add a render call to the end of your action for a template you already have. for instance, just add

render :action => 'style_chooser' 

or

render :template => 'style_chooser'

where style_chooser is the view you are presenting the user with or changing the style for