Rails 3 and Nested Forms
When developing nested forms in Rails you need to tell each model what their relation is with other models, like this:
What I didn’t know is that you also need to manually declare the attributes relation to accessible, when you are already using attr_accessible in the related model(s). (Thanks dixis for the comment).
Read more about it here: http://www.notesfromthecloud.com/2010/05/acceptsnestedattributesfor-and.html
