Add support for partial option when no block is used with fields_for

README.md

@@ -81,13 +81,19 @@ Use `simple_nested_form_for` or `semantic_nested_form_for` for SimpleForm and Fo
 
 ## Partials
 
-It is often desirable to move the nested fields into a partial to keep things organized. If you don't supply a block to fields_for it will look for a partial and use that.
+It is often desirable to move the nested fields into a partial to keep things organized. If you don't supply a block to fields_for it will look for a partial to use.
 
 ```erb
 <%= f.fields_for :tasks %>
 ```
 
-In this case it will look for a partial called "task_fields" and pass the form builder as an `f` variable to it.
+In this case it will look for a partial called "task_fields". You can also pass a specific partial as an option:
+
+```erb
+<%= f.fields_for :tasks, partial: 'partial/path' %>
+```
+
+In either case the form builder will be passed as an `f` variable to the partial.
 
 
 ## Specifying a Target for Nested Fields

lib/nested_form/builder_mixin.rb

@@ -73,14 +73,18 @@ def link_to_remove(*args, &block)
 
  def fields_for_with_nested_attributes(association_name, *args)
  # TODO Test this better
- block = args.pop || Proc.new { |fields| @template.render(:partial => "#{association_name.to_s.singularize}_fields", :locals => {:f => fields}) }
+ block = args.pop
 
  options = args.dup.extract_options!
 
  # Rails 3.0.x
  if options.empty? && args[0].kind_of?(Array)
  options = args[0].dup.extract_options!
  end
+
+ # Check for a :partial option or use the default
+ partial = options.delete(:partial) || "#{association_name.to_s.singularize}_fields"
+ block ||= Proc.new { |fields| @template.render(:partial => partial, :locals => {:f => fields}) }
 
  @fields ||= {}
  @fields[fields_blueprint_id_for(association_name)] = { :block => block, :options => options }