add documents editor

app/controllers/template_documents_modify_controller.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+class TemplateDocumentsModifyController < ApplicationController
+  load_and_authorize_resource :template
+
+  def create
+    authorize!(:update, @template)
+
+    documents_layout =
+      params.require(:documents).map do |item|
+        item.permit(:attachment_uuid,
+                    pages: [:attachment_uuid, :page, :rotate,
+                            { redact: [%i[x y w h]], replaced_page: %i[attachment_uuid page] }]).to_h
+      end
+
+    Templates::ModifyDocuments.call(@template, documents_layout)
+
+    render json: {
+      schema: @template.schema,
+      fields: @template.fields,
+      submitters: @template.submitters,
+      documents: @template.schema_documents.reload.preload(:blob, preview_images_attachments: :blob).as_json(
+        methods: %i[metadata signed_key],
+        include: {
+          preview_images: { methods: %i[url metadata filename] }
+        }
+      )
+    }
+  rescue Templates::ModifyDocuments::InvalidLayout
+    render json: { error: I18n.t(:unable_to_save) }, status: :unprocessable_content
+  end
+end