olvidar contenido cuando se confirma el guardado

app/assets/javascripts/02-editor.js

@@ -6,9 +6,9 @@ const origin = location.origin
  *
  * Usamos la URL completa sin anchors.
  */
-const storageKey = (editorEl) => window.location.href.split('#')[0] + '#' + editorEl.id
+const storageKey = (editorEl) => editorEl.querySelector('[data-target="storage-key"]').value
 
-const forgetContent = (editorEl) => window.localStorage.removeItem(storageKey(editorEl))
+const forgetContent = (storedKey) => window.localStorage.removeItem(storedKey)
 
 const storeContent = (editorEl, contentEl) => {
 	if (contentEl.innerText.trim().length === 0) return
@@ -511,10 +511,6 @@ function setupEditor (editorEl) {
 		video.controls = false
 	}
 
-	// Eliminar el contenido al enviar los cambios válidos.	Esto no nos
-	// protege frente a errores en el servidor!
-	editorEl.closest('form').addEventListener('submit', event => forgetContent(editorEl))
-
 	cleanContent(contentEl)
 	fixContent(contentEl)
 
@@ -539,5 +535,17 @@ document.addEventListener("turbolinks:load", () => {
 
 		setupEditor(editorEl)
 	}
-})
 
+	const flash = document.querySelector('.js-flash[data-target="editor"]')
+	if (!flash) return
+
+	switch (flash.dataset.action) {
+		case 'forget-content':
+			if (!flash.dataset.keys) break
+
+			try { JSON.parse(flash.dataset.keys).forEach(forgetContent) } catch { }
+
+			break
+		default:
+	}
+})

app/controllers/posts_controller.rb

@@ -81,6 +81,7 @@ class PostsController < ApplicationController
 
     if @post.persisted?
       @site.touch
+      forget_content
 
       redirect_to site_post_path(@site, @post)
     else
@@ -110,6 +111,7 @@ class PostsController < ApplicationController
 
     if service.update.persisted?
       @site.touch
+      forget_content
 
       redirect_to site_post_path(@site, @post)
     else
@@ -161,4 +163,10 @@ class PostsController < ApplicationController
       l == params[:locale]
     end
   end
+
+  # Instruye al editor a olvidarse el contenido del artículo.  Usar
+  # cuando hayamos guardado la información correctamente.
+  def forget_content
+    flash[:js] = { target: 'editor', action: 'forget-content', keys: params[:storage_keys].to_json }
+  end
 end

app/views/layouts/_flash.haml

@@ -1,3 +1,3 @@
 - flash.each do |type, message|
-  .alert{ role: 'alert', class: "alert-#{type}" }
-    = message
+  - unless type == 'js'
+    .alert{ role: 'alert', class: "alert-#{type}" }= message

app/views/layouts/application.html.haml

@@ -27,3 +27,5 @@
   %body{ class: yield(:body) }
     .container-fluid#sutty
       = yield
+      - if flash[:js]
+        .js-flash.d-none{ data: flash[:js] }

app/views/posts/attributes/_content.haml

@@ -4,6 +4,8 @@
     post: post, attribute: attribute, metadata: metadata
 
   .editor{ id: attribute }
+    -# Esto es para luego decirle al navegador que se olvide estas cosas.
+    = hidden_field_tag 'storage_keys[]', "#{request.original_url}##{attribute}", data: { target: 'storage-key' }
     .alert.alert-info
       :markdown
         #{t('editor.alert')}