Add form update

app/controllers/forms_controller.rb

@@ -25,6 +25,19 @@ class FormsController < ApplicationController
     end
   end
 
+  def edit
+    @form = current_user.forms.find_by!(token: params[:id])
+  end
+
+  def update
+    @form = current_user.forms.find_by!(token: params[:id])
+    if @form.update(form_params)
+      redirect_to form_url(@form)
+    else
+      render :edit
+    end
+  end
+
   def form
     @form = Form.find_by!(token: params[:id])
   end