How to comment code in Rails views?

问题

As I'm playing with Rails and developing views I often want to comment out code. Simple enough with classes & models but views are a bit more tricky.

What's best way to comment code in a view so it's not interpreted by, well, anything... HTML gives us  though code enclosed here seems to get interpreted anyway?!? Or is there a more Railsy way?

回答1:

<% code code # comment %> USED to work but I think that was accidental.

You were always supposed to put comments in separate comment tags <%# comment %>

Note NO SPACE before the pound.

Now the old loophole is closed (I forget whether 'now' means Ruby 1.8 or Rails 3 or what) so that:

<% code code  #  this runs too %>
<% # also runs %>
<%# the only way to comment out %>

回答2:

I use this all the time

<%# This is a comment %>

回答3:

The reason Ruby code would be executed inside  HTML comments is because all of the server side code (ie. Ruby) is interpreted first, and then the output is sent to the client, at which point the browser interprets  as a comment. As the other answers said, use <% #comment %> to comment within a Rails view.

回答4:

Although (and i'm hoping to be corrected here) you have to be careful because i've had some really strange behavior when doing something like this:

<% if (my_boolean) # Commenting on this if-block %>

where it will affect the HTML that directly follows that (even if it's on another line).

Anyone?

And would this qualify as an answer, or a comment?

回答5:

<% #comment here %>

来源：https://stackoverflow.com/questions/3095925/how-to-comment-code-in-rails-views