add builder dashboard dropzone

app/controllers/template_replace_documents_controller.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class TemplateReplaceDocumentsController < ApplicationController
+  load_and_authorize_resource :template
+
+  def create
+    if params[:blobs].blank? && params[:files].blank?
+      return respond_to do |f|
+        f.html { redirect_back fallback_location: template_path(@template), alert: I18n.t('file_is_missing') }
+        f.json { render json: { error: I18n.t('file_is_missing') }, status: :unprocessable_entity }
+      end
+    end
+
+    ActiveRecord::Associations::Preloader.new(
+      records: [@template],
+      associations: [schema_documents: :preview_images_attachments]
+    ).call
+
+    cloned_template = Templates::Clone.call(@template, author: current_user)
+    cloned_template.save!
+
+    documents = Templates::ReplaceAttachments.call(cloned_template, params, extract_fields: true)
+
+    cloned_template.save!
+
+    Templates::CloneAttachments.call(template: cloned_template, original_template: @template,
+                                     excluded_attachment_uuids: documents.map(&:uuid))
+
+    respond_to do |f|
+      f.html { redirect_to edit_template_path(cloned_template) }
+      f.json { render json: { id: cloned_template.id } }
+    end
+  rescue Templates::CreateAttachments::PdfEncrypted
+    render json: { error: 'PDF encrypted', status: 'pdf_encrypted' }, status: :unprocessable_entity
+  end
+end