Listing out available variables in an ERB template

ruby-talk
1

Hi All,

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

    <div><%= @div_1 %></div>
    <div><%= @div_2 %></div>
    <div><%= @div_3 %></div>

Is there a way I can programatically list out all the available variables in
the template?

For example, the following method:

    def list_out_variables
      template = File.open("path_to/my_template.html.erb", "rb").read
      erb = ERB.new( template )
      erb.this_method_would_list_out_variables
    end

would return something like:

    ['div1','div2','div3']

Any help would be greatly appreciated.

Thanks,
Mike

2

Ruby has some reflexive methods you can use.

$gvar = 1
lvar = 2
@ivar = 3
class Foo
  @@cvar = 4
end

p instance_variables
p global_variables
p local_variables
class Foo
  p class_variables
end

···

On Sun, Sep 26, 2010 at 8:12 PM, mgerstenblatt@gmail.com < mgerstenblatt@gmail.com> wrote:

Hi All,

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

   <div><%= @div_1 %></div>
   <div><%= @div_2 %></div>
   <div><%= @div_3 %></div>

Is there a way I can programatically list out all the available variables
in
the template?

For example, the following method:

   def list_out_variables
     template = File.open("path_to/my_template.html.erb", "rb").read
     erb = ERB.new( template )
     erb.this_method_would_list_out_variables
   end

would return something like:

   ['div1','div2','div3']

Any help would be greatly appreciated.

Thanks,
Mike