ERB and the case statement

show.html.erb

# Doesn't work
	<p>
		<% case @request.author_hosted %>
		<% when "yes" %>
		The school <b>has</b> hosted an author before.
		<% when "no" %>
		The school <b>has not</b> hosted an author before.
		<% end %>
	</p>

# Does
	<p>
		<% case @request.author_hosted 
		   when "yes" %>
		The school <b>has</b> hosted an author before.
		<% when "no" %>
		The school <b>has not</b> hosted an author before.
		<% end %>
	</p>

Eight years later, this is still relevant. Thanks!

Thank you 🚀

LOL, just used this tip last week.

Thanks!

wow

Ruby 2.3.1 ERB works without this hack ;) Didn't tested on previous versions

Thanks a lot!

Thanks!

@adis-io Hmm, I still had to use the workaround for Ruby 2.3.3:

$ rails c
Running via Spring preloader in process 90217
Loading development environment (Rails 5.1.2)
>> ERB.version
=> "erb.rb [2.1.0 2015-12-20]"

$ ruby -v
ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin17]

Edit: Turns out the vim plugin which runs linters on files must have been using the old (system) version of Ruby, as it indeed works without the hack.

I believe this StackOverflow post explains the need for the above workaround: https://stackoverflow.com/questions/5282585/syntaxerror-using-case-expression-on-sinatra-1-2-0-and-ruby-1-9-2

Edit: Thus <% case @request.author_hosted; when "yes %> should also work

Still relevant 14 years later.

$ rails c
DEBUGGER[spring app    | platform | started 1 hour ago | development mode#240953]: Attaching after process 191655 fork to child process 240953
Running via Spring preloader in process 240953
Loading development environment (Rails 7.0.3)
irb(main):001:0> ERB.version
=> "2.2.3"
irb(main):002:0> exit

$ ruby -v
ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [x86_64-linux]

Oh man thanks for this

In case someone is curious, here is an issue on the ERB repo: ruby/erb#4

Found that adding a line break also works:

Doesn't work

<p>
	<% case @request.author_hosted %>
	<% when "yes" %>
	The school <b>has</b> hosted an author before.
	<% when "no" %>
	The school <b>has not</b> hosted an author before.
	<% end %>
</p>

Does

<p>
	<% case @request.author_hosted 
	   when "yes" %>
	The school <b>has</b> hosted an author before.
	<% when "no" %>
	The school <b>has not</b> hosted an author before.
	<% end %>
</p>

Also Does

<p>
	<% case @request.author_hosted -%>
	<% when "yes" %>
	The school <b>has</b> hosted an author before.
	<% when "no" %>
	The school <b>has not</b> hosted an author before.
	<% end %>
</p>