panel/app/views/posts/_form.haml

- unless post.errors.empty?
  .alert.alert-danger
    %ul
      - post.errors.each do |key, error|
        %li
          %strong
            = key.capitalize
          = [error].flatten.join("\n")

-# TODO: habilitar form_for
:ruby
  if post.new?
    url = site_posts_path(site)
    method = :post
  else
    url = site_post_path(site, post)
    method = :patch
  end

-# Comienza el formulario
= form_tag url, method: method, class: 'form post', multipart: true do

  -# Botones de guardado
  = render 'posts/submit', site: site

  -# Dibuja cada atributo
  - post.attributes.each do |attribute|
    - metadata = post.send(attribute)
    - type = metadata.type
    = render "posts/attributes/#{type}",
      post: post, attribute: attribute,
      metadata: metadata

  -# Botones de guardado
  = render 'posts/submit', site: site