Do you think we should make <%= # comment %> not cause error

Rails
1

the code

<% # some code %>

will not cause any error, but the code

<%= # some code %>

will cause an error.

the argument is that the second statement is like

output <<

and so it is an error.

But I think since

puts “hello”

and

puts

both can run and cause no error, why not make

<%= # some code %>

not cause any error too? If we have a language / platform that will
cause an error when we just comment out code, it is a big issue in the
long term, since usually when we comment out something, we won’t easily
cause a problem and may have a hard time finding what the cause is.

for sure, we can change it to

<% # some code %>

but we lose the note there that we were going to output the content.
When we uncomment the code, we don’t know for sure whether it should be
<% %> or <%= %> and is prone to mistake again.

2

Report it at http://rails.uservoice.com, I’d +1 it!

–
Roderick van Domburg
http://www.nedforce.com

3

In addition I meant to say that according to the ticket link, <%=# and
<%= #
are also not valid erb comments.
Colin

2009/5/24 Colin L. [email protected]

4

I believe that <% #… %> is not a valid erb comment (no space is
allowed
after %). See
#1580 Whitespace Bug in Erb Comments in Rails 2.2.2 - Ruby on Rails - rails.
You have to read through the comments to get to the conclusion.

Colin

2009/5/24 SpringFlowers AutumnMoon [email protected]

5

Colin L. wrote:

In addition I meant to say that according to the ticket link, <%=# and
<%= #
are also not valid erb comments.
Colin

2009/5/24 Colin L. [email protected]

I Commented code in erb in following ways

<%# This is Comment %>

<%#
This is Comment
%>

<%#= This is Comment %>

<%#=
This is Comment
%>

6

Salil G. wrote:

I Commented code in erb in following ways

<%# This is Comment %>

<%#
This is Comment
%>

<%#= This is Comment %>

<%#=
This is Comment
%>

i see. that’s smart. then we don’t need <%= #comment %> to work. but
if it can, i think it might be good.