I'm having some issues with the saving of my models. I'll explain my models, and then I'll explain the problems I'm having. I've got a model called ContentPage that contains the html for several of the pages of my website. I'm trying to add a feature where a document outline, with links to the appropriate places in the page, is automatically generated when a ContentPage is saved. The document outline is generated based on the header tags. My document outline is held in my document_outline_item table and corresponding model. Here's the migration I have that creates it:
create_table :document_outline_items do |t| t.column "text", :string, :null => false t.column "content_page_id", :integer, :null => false t.column "parent_id", :integer, :null => true t.column "position", :integer, :null => true t.column "anchor_identifier", :string, :null => false end
The content_page_id field is a foreign key to the content_page this document outline item is for. The parent_id field points back to a document_outline_item so that my doc outline can be nested.
Here's how I've setup my document outline item model:
class DocumentOutlineItem < ActiveRecord::Base belongs_to :content_page acts_as_tree :order => :position acts_as_list :scope => :parent_id
validates_presence_of :text, :position, :content_page_id, :anchor_identifier
ContentPage has the corresponding has_many :document_outline_items declaration.
So, ContentPage has a document_outline_items collection. This contains all the document outline items for the content page, not just the top level ones. DocumentOutlineItem is setup to have a children document_outline_items collection using the acts_as_tree declaration. So, one document outline item can be held in both the ContentPage's document_outline_items collection, and also in a parent DocumentOutlineItem's children collection.
When I modify an existing content page, everything works beautifully. My document outline gets generated and saved properly. When I create a new content page, only the leaf document_outline_items (i.e. those that do not have any children) get saved. This occurs because the content_page_id has not been set on any of the document_outline_items, since the ContentPage has not yet been saved and hence does not have an id. At some point, the content_page_id gets set on the leaf items, and they get saved. On the parent items, the child items have not yet had this field set when they are validated, and hence the children association fails validations, and they do not get saved.
Any ideas on how to fix this? And when do the parent_id and content_page_id get set in the children?
Thanks, Myron
