redirect_to_primary_site: false
models:
 Layout:
   name: 
     message:
       'name already in use'
     scope:
       site_id
 Page:
   slug:
     scope: 
       - parent_id
       - site_id
     message:
       'slug already in use for child of parent'
 Snippet:
   name:
     message:
       'name already in use'
     scope:
       site_id