implement duplication

app/controllers/contract_templates/duplicates_controller.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class ContractTemplates::DuplicatesController < ApplicationController
+  before_action :set_contract_template
+
+  def create
+    authorize(ContractTemplate)
+    new_contract_template = @contract_template.dup
+    new_contract_template.name = I18n.t('contract_templates.duplicate.name_prefix', template_name: @contract_template.name)
+
+    # Duplicate rich text fields
+
+    new_contract_template.body = @contract_template.body
+    new_contract_template.guardian_clause = @contract_template.guardian_clause
+    new_contract_template.signature_legal_text = @contract_template.signature_legal_text
+
+    if new_contract_template.save
+      redirect_to [:edit, new_contract_template]
+    else
+      redirect_to [@contract_template.project, :contract_templates], alert: t('.error')
+    end
+  end
+
+  private
+
+  def contract_templates
+    policy_scope(ContractTemplate)
+  end
+
+  def set_contract_template
+    @contract_template = contract_templates.find(params[:contract_template_id])
+  end
+end