[Rails] Fixtures and Associations

I have a concrete table with an associated join table and I'm trying to
load up some test data but cannot seem to get the fixtures file correct.
The parent/child relationship works great but the fixtures fail to load.
Any help would be greatly appreciated.

Here is what I have...

# app/models/node.rb
class Node < ActiveRecord::Base
belongs_to :category
belongs_to :status

has_one :parents,
:class_name => "NodeGroup",
:foreign_key => "child_id"

has_one :parent, :through => :parents

has_many :children,
:class_name => "NodeGroup",
:foreign_key => "parent_id"

end

# app/models/node_group.rb
class NodeGroup < ActiveRecord::Base
belongs_to :parent, :class_name => "Node"
belongs_to :child, :class_name => "Node"
end

# test/fixtures/nodes.yml
parent1:
name: Parent1
children: child1

parent2:
name: Parent2

child1:
name: Child1
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