Rails & Redcarpet: uninitialized constant Redcarpet::Render when used in ApplicationHelper

Question

I'm following along the RailsCasts episode for Syntax Highlighting Revised. I updated my ApplicationHelper to look like so:

require 'redcarpet'

module ApplicationHelper
  class HTMLwithPygments < Redcarpet::Render::HTML
    def block_code(code, language)
      Pygments.highlight(code, lexer:language)
    end
  end

  def markdown(text)
    renderer = HTMLwithPygments.new(hard_wrap: true, filter_html: true)
    options = {
      autolink: true,
      no_intra_emphasis: true,
      fenced_code_blocks: true,
      lax_html_blocks: true,
      strikethrough: true,
      superscript: true
    }
    Redcarpet::Markdown.new(renderer, options).render(text).html_safe
  end
end

However, my web app returns

Routing Error

uninitialized constant Redcarpet::Render

Try running rake routes for more information on available routes. 

I'm using Rails 3.2.11 and Redcarpet responds fine in rails console. I've originally didn't include require 'redcarpet' but I followed the instructions on here but it didn't help.

Primm

Answer 1

I removed my Gemfile.lock and did bundle install again and it worked perfectly.

Primm

BTW it might just have been that you needed to restart your server. This was the case for me. – Penholder

I tried that a few times and it didn't help but I'll keep the advice in mind in case of future strangeness. :) – Primm

@Penholder that was the case for me, in the rails console reload! didn't do it, I had to stop and restart it. – Utgardloki