Render a partial to an instance variable
Normally, if you call "render_partial" within a controller, nothing but the partial will be rendered.
Occasionally, it is useful to render a partial to an instance variable as a string so that the view can still be rendered as normal, and the string can be passed in to the view.
Occasionally, it is useful to render a partial to an instance variable as a string so that the view can still be rendered as normal, and the string can be passed in to the view.
add_variables_to_assigns @content_for_navbar = @template.render_partial 'layouts/public_navbar'
