explicitly set table name

otherwise active record assumes it's a lowercase + pluralized version of
the class name.

lib/generators/categoria/templates/model.rb.erb

@@ -4,7 +4,9 @@ module <%= Rails.application.class.module_parent %>
   module <%= domain_module %>
     module Internal
       module Models
-        class <%= internal_model_class_name %> < ApplicationRecord; end
+        class <%= internal_model_class_name %> < ApplicationRecord
+          self.table_name = "<%= domain_prefixed_relation_name %>"
+        end
       end
     end
   end