Rails: Is it possible to write view helpers with HAML syntax?

Question

During refactoring it would be quite handy just to copy part of HAML template and paste it to helper\'s code. Currently in such cases 1) I have to rewrite that part of view from

Answer 1

I used heredoc for such purposes:

  def view_helper
    Haml::Engine.new(<<~HAML).render
      .example
        #id ID
        .desc Description
    HAML
  end

This way has a lot of issues with a scope of variables, so, as mentioned above, the much more correct way is to use partials for this.

UPD1: here is a solution on how to solve issues with scope:

  def view_helper
    Haml::Engine.new(<<~HAML).render(self)
      .form
        = form_tag root_path do
          = submit_tag :submit
    HAML
  end

UPD2: even better solution(founded on the internet):

def render_haml(haml, locals = {})
  Haml::Engine.new(haml.strip_heredoc, format: :html5).render(self, locals)
end

def greeting
  render_haml <<-HAML
    .greeting
      Welcome to
      %span.greeting--location
        = Rails.env
  HAML
end