Programmatically generated Spree Taxons not showing tree in Admin

I am trying to generate a Spree Commerce taxonomy programmatically within a Ruby script (a la seeds.rb). In the customer-facing product pages the Taxons appear, but they do not work from the Admin pages.

The "tree" view of the Taxonomy shows the root node, but no children
On the product edit page, I cannot add any of my Taxons

Here's an example:

taxonomy_stones = Spree::Taxonomy.where(:name => 'Gemstone Type').first_or_create
tax_stones = Spree::Taxon.where(name: "Gemstone", parent: nil, taxonomy: taxonomy_stones).first_or_create
tax_diamond = Spree::Taxon.where(name: "Diamond", parent: tax_stones, taxonomy: taxonomy_stones).first_or_create
  tax_fancy_yellow = Spree::Taxon.where(name: "Fancy Yellow Diamond", parent: tax_diamond, taxonomy: taxonomy_stones).first_or_create
  tax_fancy_pink = Spree::Taxon.where(name: "Fancy Pink Diamond", parent: tax_diamond, taxonomy: taxonomy_stones).first_or_create

When I run this, entries appear in the database for my Taxonomy and Taxons. I am able to programmatically associate Products to the Taxons:

product_BL212.taxons << tax_diamond

I'm guessing that my Taxon-creation code is incomplete or incorrect in some way, but I am not sure how. Can anyone who is more familiar with Spree's internals provide an example of doing this correctly?

Further Observations

I used the Admin UI to create sample Taxonomies and have compared the database entries to my generated ones. The name and permalink fields in spree_taxons are blank for my generated Taxons, but not the Spree-created ones. When I manually populated some of the values for the root node and two sample children, the taxonomy/taxons still don't work correctly in Admin.

Is it important to have these values populated in spree_taxons when spree_taxons_translations has the needed information? If so, how do I get Spree to populate the values for these fields correctly?

Solution

Calling Spree::Taxon.rebuild! after adding the Taxons resolves the issue.