Is there a way to list the available variables in an Ruby ERB template?

Question

Suppose I have a Ruby ERB template named my_template.html.erb, and it contains the following:

<%= @div_1 %>
<         


        

Answer 1

To get a list of variables available to your .erb file (from the controller):

Add a breakpoint in the erb:

<% debugger %>

Then type instance_variables in the debugger to see all of the available instance variables.

Added: Note that instance_variables is a method available from the Ruby class Object and all of its subclasses. (As noted by @mikezter.) So you could call the method programmatically from within your sw rather than using the debugger if you really wanted to.

You'll get back a list of instance variables for the current object.

Added: To get a list of the variables used by an .erb file:

# <template> is loaded with the entire contents of the .erb file as
# one long string
var_array = template.scan(/(\@[a-z]+[0-9a-z]*)/i).uniq