Output slim to variable - ruby-on-rails

Question

I'm using Base64.encode64(val) to convert html to base64.
Example:
- val = link_to 'Link', link_path
= Base64.encode64(val)
But how can I get slim markup to variable? Like so:
.class = link_to 'Link', link_path # <- this output with slim div
Or even multiple lines
div
span
.another_div
There is a way by putting slim code into partial and do this:
- var = render 'partial'
= Base64.encode64(var) # Convert into base64
How to do this without partial?

Answer 1

Slim exposes its templating through the Tilt interface, like so:
# Render a template file:
Slim::Template.new("template.slim", options).render(scope)
# Render a string:
Slim::Template.new(options) { "b slim markup" }.render(scope)
Where options is an optional hash of options for slim and scope is the object in which the template code is executed.
So the following:
slim_markup = <<-SLIM
div
span
.another_div
SLIM
# The options hash and scope have been omitted for the sake of simplicity
html_output = Slim::Template.new { slim_markup }.render
Sets the value of html_output to:
<div></div>
<span></span>
<div class="another_div"></div>
But for your example with the url helper link_path, you must provide slim a scope in which the url helpers are available e.g. a controller.

Answer 2

This is an old question, but I have wondered about this many times, and I always spend a lot of time researching it.
Using Slim 4 you can use capture directly:
- val = capture
div
span
.another_div
This will put the rendered slim into your variable.

Answer 3

Another way from the box using capture method. From the docs:
Using the Binding you can capture to local variables as follows:
module Helpers
def capture_to_local(var, &block)
set_var = block.binding.eval("lambda {|x| #{var} = x }")
# In Rails we have to use capture!
# If we are using Slim without a framework (Plain Tilt),
# you can just yield to get the captured block.
set_var.call(defined?(::Rails) ? capture(&block) : yield)
end
end
The helper can then be used in the Slim template as follows
/ The captured_content variable must be known by the Binding beforehand.
= capture_to_local captured_content=:captured_content
p This will be captured in the variable captured_content
= captured_content
Read more https://github.com/slim-template/slim#capturing-to-local-variables