Understanding Associations with Multiple forms on a Page

I have a project with the following relationships:

   class Project < ActiveRecord::Base       has_one :photo       has_one :project_detail

   class Photo < ActiveRecord::Base       belongs_to :project, :accessible => true, :creator => true

   class ProjectDetail < ActiveRecord::Base       belongs_to :project, :accessible => true, :creator => true

I am trying to create a page with 4 forms, 3 to upload photos with paperclip, and one to upload project_details.

The page is created by the ProjectsController. In that I currently have been creating the following in 'new':

    @project = Project.new     @project.build_photo     @project.photo.save (If I save project, does it also save project.photo?)     @project.photo_id = @project.photo.id (does rails do this automatically?)     @project.build_project_detail     @project.project_detail.save

    @project.project_detail_id = @project.project_detail.id (does rails do this automatically?)     @project.save     redirect_to :action => "edit", :id => @project.id, :photo_id => @project.photo_id, :project_detail_id => @project.project_detail_id

The above seems very redundant and unnecessary. I would like to know a much better way of going about this. The reason for saving and redirecting to edit was so that the project id would be created when I upload a photo.

The page is supposed to function by being able to upload the 3 images, and then upload the project_details. Since AJAX does not support file uploads, I am going to try and implement an 'Ajaxy' solution using iframes and the "responds_to_parent" plugin. However, first I would like to know answers to the following:

1) What is a better approach than the one above for setting up the new project page? 2) In my photo form I am passing @project.photo. This does get handled by the photo controller, but the     following does not work in the PhotosController:

    @project = Project.find(params[:project_id])     @project.photo.update_attributes(params[:photo])

    A hidden field in the form is:

      <input id="photo_project_id" type="hidden" value="142" name="photo[project_id]"/>

The above does not work.

  So what is the correct way to achieve the above?

  This does work: @photo = Photo.new(params[:photo]) ....but is not what I want.   The photo model has fields for 3 photos, so I need to use the same record for all   3 uploads.

3) In the photos controller, what is the correct way to redirect to the page I just came from.

    In the Projects controller I used:

    redirect_to :action => "edit", :id => @project.id, :photo_id => @project.photo_id, :project_detail_id => @project.project_detail_id

   ...which worked great. I thought I could just change that to "projects/edit, but no. Something like       :url => (page I just came from)??



Oh, and a bonus question. If I have the above mentioned relationship with project and photo, and I create an instance in the projects controller: @project.photo

how would I access the photo data in the returned params hash from a form, e.g. to access the project data (params[:project])

would accessing photo part be (params[:project => :photo])

...and an individual element (params[:project => :photo => :name]) ???