diff --git a/app/javascript/controllers/modal_controller.js b/app/javascript/controllers/modal_controller.js
index 3a614b80..011c1254 100644
--- a/app/javascript/controllers/modal_controller.js
+++ b/app/javascript/controllers/modal_controller.js
@@ -3,8 +3,27 @@ import { Controller } from "stimulus";
 export default class extends Controller {
   static targets = ["modal", "backdrop"];
 
+  // TODO: Stimulus >1
+  connect() {
+    this.showEvent = this.show.bind(this);
+
+    window.addEventListener("modal:show", this.showEvent);
+  }
+
+  // TODO: Stimulus >1
+  disconnect() {
+    window.removeEventListener("modal:show", this.showEvent);
+  }
+
+  /*
+   * Podemos enviar la orden de apertura como un click o como un
+   * CustomEvent incluyendo el id del modal como detail.
+   */
   show(event = undefined) {
     event?.preventDefault();
+    const modalId = event?.detail?.id;
+
+    if (modalId && this.element.id !== modalId) return;
 
     this.modalTarget.style.display = "block";
     this.backdropTarget.style.display = "block";
diff --git a/app/views/posts/attributes/_new_has_many.haml b/app/views/posts/attributes/_new_has_many.haml
index f8ec89d4..76cf299f 100644
--- a/app/views/posts/attributes/_new_has_many.haml
+++ b/app/views/posts/attributes/_new_has_many.haml
@@ -4,8 +4,9 @@
   id = "#{base}_#{attribute}"
   name = "#{base}[#{attribute}][]"
   form_id = "form-#{Nanoid.generate}"
+  modal_id = "modal-#{Nanoid.generate}"
 
-%div{ data: { controller: 'modal array', 'array-original-value': metadata.value.to_json, 'array-new-array-value': site_posts_new_related_post_path(site) } }
+%div{ id: modal_id, data: { controller: 'modal array', 'array-original-value': metadata.value.to_json, 'array-new-array-value': site_posts_new_related_post_path(site) } }
   .form-group
     = hidden_field_tag name, ''
     = label_tag id, post_label_t(attribute, post: post)