add the ability to clone a template

app/controllers/templates_controller.rb

@@ -3,6 +3,8 @@
 class TemplatesController < ApplicationController
   layout false
 
+  before_action :load_base_template, only: %i[new create]
+
   def show
     @template = current_account.templates.preload(documents_attachments: { preview_images_attachments: :blob })
                                .find(params[:id])
@@ -10,13 +12,22 @@ class TemplatesController < ApplicationController
 
   def new
     @template = current_account.templates.new
+    @template.name = "#{@base_template.name} (Clone)" if @base_template
   end
 
   def create
-    @template = current_account.templates.new(template_params)
+    @template =
+      if @base_template
+        current_account.templates.new(**@base_template.slice(:fields, :schema, :submitters), **template_params)
+      else
+        current_account.templates.new(template_params)
+      end
+
     @template.author = current_user
 
     if @template.save
+      Templates::CloneAttachments.call(template: @template, original_template: @base_template) if @base_template
+
       redirect_to template_path(@template)
     else
       render turbo_stream: turbo_stream.replace(:modal, template: 'templates/new'), status: :unprocessable_entity
@@ -35,4 +46,12 @@ class TemplatesController < ApplicationController
   def template_params
     params.require(:template).permit(:name)
   end
+
+  def load_base_template
+    return if params[:base_template_id].blank?
+
+    @base_template = current_account.templates
+                                    .preload(documents_attachments: :preview_images_attachments)
+                                    .find_by(id: params[:base_template_id])
+  end
 end