Something not right here with Kate.

app/views/credentials/_form.html.erb

@@ -1,4 +1,4 @@
-<%= form_with(model: credential) do |form| %>
+<%= form_with(model: [@domain, credential]) do |form| %>
   <% if credential.errors.any? %>
     <div style="color: red">
       <h2><%= pluralize(credential.errors.count, "error") %> prohibited this credential from being saved:</h2>

app/views/credentials/new.html.erb

@@ -5,5 +5,5 @@
 <br>
 
 <div>
-  <%= link_to "Back to credentials", credentials_path %>
+  <%= link_to "Back to the domain", domain_path(@domain) %>
 </div>

app/views/domains/show.html.erb

@@ -2,10 +2,7 @@
 <h1><%= @domain.domain %></h1>
 
 <div>
-  <%= link_to "Edit this domain", edit_domain_path(@domain) %> |
-  <%= link_to "Back to domains", domains_path %>
-
-  <%= button_to "Destroy this domain", @domain, method: :delete %>
+  <%= link_to "Edit this domain", edit_domain_path(@domain) %> | <%= link_to "Back to domains", domains_path %> | <%= button_to "Destroy this domain", @domain, method: :delete %>
 </div>
 
 <h2>Credentials (<%= @domain.credentials.count %>)</h2>