Do you have any sample code? It would be easier to help if there was something to see, or a more detailed description of how it does not work.
OK -
Some points to help you get started:
1 - in your Progress model, you accept nested attributes for a model that does not exist: you need a ProgressImage model with attachments to clip:
class ProgressImage < ActiveRecord::Base belongs_to :progress has_attached_file :photo end
2 - Your form of progress is not composite, it should be:
<% form_for @progress, :html => { :multipart => true } do |f| %>
3 - for your form of the move, the nested fields of the attribute file are needed, there are various articles on how to do this:
http://weblog.rubyonrails.org/2009/1/26/nested-model-forms
4- Theres also a plugin that I found useful for nested attribute forms called add_nested_fields: http://github.com/miletbaker/add_nested_fields
5 - You have the transition to adding paperclip columns to a nonexistent progress image table — you can also change this migration to create a table and include those paperclip dependent columns, and then you need to run it with rake db:migrate .