Improve workflow with devise generator.

CHANGELOG.rdoc

@@ -12,6 +12,7 @@
   * Move trackable logic to the model.
   * E-mails now use any template available in the filesystem. Easy to create multipart e-mails.
   * E-mails asks headers_for in the model to set the proper headers.
+  * Allow to specify haml in devise_views.
 
 * bug fix
   * Do not use lock! on lockable since it's part of ActiveRecord API.

lib/generators/devise/devise_generator.rb

@@ -18,13 +18,19 @@ class DeviseGenerator < Rails::Generators::NamedBase
     Time.now.utc.strftime("%Y%m%d%H%M%S")
   end
 
+  class_option :orm
   class_option :migration, :type => :boolean, :default => orm_has_migration?
 
   def invoke_orm_model
-    if File.exists?(File.join(destination_root, model_path))
+    if model_exists?
       say "* Model already exists. Adding Devise behavior."
     else
-      invoke "model", [name], :migration => false
+      invoke "model", [name], :migration => false, :orm => options[:orm]
+
+      unless model_exists?
+        abort "Tried to invoke the model generator for '#{options[:orm]}' but could not find it.\n" <<
+              "Please create your model by hand before calling `rails g devise #{name}`."
+      end
     end
   end
 
@@ -51,6 +57,10 @@ CONTENT
 
   protected
 
+    def model_exists?
+      File.exists?(File.join(destination_root, model_path))
+    end
+
     def model_path
       @model_path ||= File.join("app", "models", "#{file_path}.rb")
     end