<p>I have written this generator code but it returns 'can't convert nil into String' when I call m.directory inside the manifest. Anyone know what had happened?</p>

<pre><code>class AuthGenerator &lt; Rails::Generator::NamedBase
  attr_reader :user_class_name
  def initialize(runtime_args, runtime_options={})
    @user_class_name="User"
    @controller_class_name="AccountController"
    @user_class_file_name="#{@user_class_name}.rb"
    @controller_class_file_name="#{@controller_class_name}.rb"
  end

  def manifest
    record do |m|
      m.class_collisions @controller_class_name, @user_class

      puts @user_class_name
      m.directory File.join('app/models', @user_class_name)


    end
  end
</code></pre>

<p>end</p>

Where is it choking?  Please post the full error.  You can see the source of the
```
directory
```
method
here
.
Plus, you probably just want
```
```
m.directory File.join('app/models')
```
```
Having an app/models/user directory for your generated code is not standard -- unless you're intending namespacing, which it doesn't look like.