app/views/categories/_check_box.html.haml
%li.evenly_spaced.nav-item{id: "category_check_box_#{category.id}"}
= label_tag "check_box_#{category.id}" do
= check_box_tag "recipe[category_ids][]",
category.id,
recipe ? recipe.categories.include?(category) : false,
id: "check_box_#{category.id}"
= category.name