feat: mostrar errores en los formularios

app/controllers/posts_controller.rb

@@ -128,7 +128,10 @@ class PostsController < ApplicationController
 
         render 'posts/new_has_many_value', layout: false
       else
-        # @todo Mostrar errores
+        headers['HX-Retarget'] = "##{params.require(:form)}"
+        headers['HX-Reswap'] = 'outerHTML'
+
+        render 'posts/form', layout: false, post: post, site: site, **params.permit(:form, :base, :dir, :locale)
       end
     elsif @post.persisted?
       redirect_to site_post_path(@site, @post)

app/views/posts/_htmx_form.haml

@@ -30,11 +30,38 @@
   end
 
 = form_tag url, **options do
+  - unless post.errors.empty?
+    - title = t('.errors.title')
+    - help = t('.errors.help')
+    = render 'bootstrap/alert' do
+      %h4= title
+      %p= help
+
+      %ul
+        - post.errors.each do |attribute, errors|
+          - if errors.size > 1
+            %li
+              %strong= post_label_t attribute, post: post
+              %ul
+                - errors.each do |error|
+                  %li= error
+          - else
+            %li
+              %strong= post_label_t attribute, post: post
+              = errors.first
+
   -# Parámetros para HTMX
-  %input{ type: 'hidden', name: 'hide', value: params.require(:show) }
-  %input{ type: 'hidden', name: 'show', value: params.require(:hide) }
+  %input{ type: 'hidden', name: 'hide', value: params.require((post.errors.empty? ? :show : :hide)) }
+  %input{ type: 'hidden', name: 'show', value: params.require((post.errors.empty? ? :hide : :show)) }
   %input{ type: 'hidden', name: 'name', value: params.require(:name) }
   %input{ type: 'hidden', name: 'base', value: params.require(:base) }
+  %input{ type: 'hidden', name: 'form', value: options[:id] }
+  %input{ type: 'hidden', name: 'dir', value: dir }
+  %input{ type: 'hidden', name: 'locale', value: locale }
+  %input{ type: 'hidden', name: 'target', value: params.require(:target) }
+  %input{ type: 'hidden', name: 'swap', value: params.require(:swap) }
+  - if params[:inverse].present?
+    %input{ type: 'hidden', name: 'inverse', value: params.require(:inverse) }
 
   = hidden_field_tag "#{base}[layout]", post.layout.name