How to comment lines in rails html.erb files?

Am a newbie to rails , please let me know the way to comment out a single line and also to comment out a block of lines in *.html.erb files.

ruby on rails notes has a very nice blogpost about commenting in erb-files

the short version is

to comment a single line use

<%# commented line %>

to comment a whole block use a if false to surrond your code like this

<% if false %>
code to comment
<% end %>

Note that if you want to comment out a single line of printing erb you should do like this

<%#= ["Buck", "Papandreou"].join(" you ") %>

##This is CLEANEST, SIMPLEST ANSWER for CONTIGUOUS NON-PRINTING Ruby Code:

The below also happens to answer the Original Poster's question without, the "ugly" conditional code that some commenters have mentioned.

---

1. CONTIGUOUS NON-PRINTING Ruby Code

• This will work in any mixed language Rails View file, e.g, *.html.erb, *.js.erb, *.rhtml, etc.

• This should also work with STD OUT/printing code, e.g. <%#= f.label :title %>

• DETAILS:

  Rather than use rails brackets on each line and commenting in front of each starting bracket as we usually do like this:

        <%# if flash[:myErrors] %>
          <%# if flash[:myErrors].any? %>
            <%# if @post.id.nil? %>
              <%# if @myPost!=-1 %>
                <%# @post = @myPost %>
              <%# else %>
                <%# @post = Post.new %>
              <%# end %>
            <%# end %>
          <%# end %>
        <%# end %>
  

  YOU CAN INSTEAD add only one comment (hashmark/poundsign) to the first open Rails bracket if you write your code as one large block... LIKE THIS:

        <%# 
          if flash[:myErrors] then
            if flash[:myErrors].any? then
              if @post.id.nil? then
                if @myPost!=-1 then
                  @post = @myPost 
                else 
                  @post = Post.new 
                end 
              end 
            end 
          end 
        %>