Adding nameservers to domain

app/controllers/admin/nameservers_controller.rb

@@ -0,0 +1,21 @@
+class Admin::NameserversController < ApplicationController
+  def new
+    @domain = Domain.find_by(params[:id])
+    @nameserver = @domain.nameservers.build
+  end
+
+  def create
+    @domain = Domain.find(params[:domain_id])
+    if @domain.nameservers.create(nameserver_params)
+      redirect_to [:admin, @domain]
+    else
+      render 'new'
+    end
+  end
+
+  private
+
+  def nameserver_params
+    params.require(:nameserver).permit(:hostname, :ipv4, :ipv6)
+  end
+end