ruby-on-railsruby

Ruby on Rails throwing exception on Ruby code

I recently downloaded and installed the latest versions of Ruby (3.4.1) and Rails (8.0.1). I created a Rails project and generated a controller with

bin/rails​​ ​​generate​​ ​​controller​​ ​​Say​​ ​​hello​​ ​​goodbye

Then I started the server and entered "localhost:3000/say/hello" in my browser. The web page displays without errors. Next, I replace the code in hello.html.erb with:

    <p>
      It is now ​<%=​ Time.​now​ ​%>​
    </p>

I got the following error when I refreshed my browser:

enter image description here

FYI, I've installed Ruby and Rails in Ubuntu 24.04, Windows 11 WSL, and Mac OSX Sequoia using:

Windows - https://rubyinstaller.org/downloads/ (Ruby+Devkit 3.3.7-1 (x64))

Ubuntu (vm running on Mac Parallels) - https://gorails.com/setup/ubuntu/24.04

Mac OSX - https://gorails.com/setup/macos/15-sequoia'

Each time I get the same result. How do I fix this?

Solution

  • You are getting this error because the code you copied includes not only normal whitespace but other invisible characters too. This is what a normal white space looks like and behaves:

    whitespace = " "
whitespace.bytes
#=> [32]

    But yours are different. This one is copied from between the = and the Time.now:

    your_space = "​ "
your_space.bytes
#=> [226, 128, 139, 32]

    This is a version with normal whitespace:

    <p>
  It is now <%= Time.now %>
</p>