NoMethodError in rails even though correct gem is installed

Question

In my gemfile, I have gem 'stringex' . After running bundle install , I added a path helper and am using a method that is from stringex. I should be able to use to_url directly on a string, like the example in the stringex readme: "simple English".to_url => "simple-english" .

However, when I try to use the method .to_url on a string in my path helper, I get:

undefined method 'to_url' for "fake title":String

My helper method looks something like:

module PostsHelper
  def post_path(post)
      "/posts/#{post.id}/#{post.title.to_url}"
  end
end

Answer 1

One thing that you can try is running bundle exec irb and then trying to require "stringex" . If you can't require the gem in properly, then it's not installed in the bundle.

Answer 2

您需要在posts_helper.rb文件的顶部添加posts_helper.rb require 'stringex' 。