Make thumbnail_url a manually overridable field for Alt Styles

Oh jeez, okay, the latest batch of Alt Styles are using a different URL
format for the thumbnail image!

This isn't something we can import via modeling, so we're gonna have to
keep on top of it manually. For now, I'll keep inferring the previous
format in case they keep using it, but here's also a console script to
fix up the latest batch. (At time of writing, not all of these are in
our database, which is fine; when pasting it into the console, those
lines will error and the script will continue.)

```rb
def update_style(color_name, species_name, thumbnail_url)
	AltStyle.find_by_color_id_and_species_id(
		Color.find_by_name(color_name),
		Species.find_by_name(species_name)
	).update!(thumbnail_url:)
end

update_style "Grey", "Blumaroo", "https://images.neopets.com/items/c0gk16fk.gif"
update_style "Grey", "Bori", "https://images.neopets.com/items/55qvx6mr.gif"
update_style "Grey", "Bruce", "https://images.neopets.com/items/6y6pyiuw.gif"
update_style "Grey", "Buzz", "https://images.neopets.com/items/7fh4avry.gif"
update_style "Grey", "Chia", "https://images.neopets.com/items/7b2jtn10.gif"
update_style "Grey", "Elephante", "https://images.neopets.com/items/0ne41rao.gif"
update_style "Grey", "Gnorbu", "https://images.neopets.com/items/75mwtqmh.gif"
update_style "Grey", "Hissi", "https://images.neopets.com/items/dxdi2mhm.gif"
update_style "Grey", "Kiko", "https://images.neopets.com/items/b9yiruxt.gif"
update_style "Grey", "Lenny", "https://images.neopets.com/items/c6cboc7e.gif"
update_style "Grey", "Lutari", "https://images.neopets.com/items/33fs4eqf.gif"
update_style "Grey", "Nimmo", "https://images.neopets.com/items/4karmgbl.gif"
update_style "Grey", "Ogrin", "https://images.neopets.com/items/dlw78fhk.gif"
update_style "Grey", "Quiggle", "https://images.neopets.com/items/0aipl0iw.gif"
update_style "Grey", "Ruki", "https://images.neopets.com/items/bjnjxsem.gif"
update_style "Grey", "Tuskaninny", "https://images.neopets.com/items/7rh57a0o.gif"
update_style "Grey", "Vandagyre", "https://images.neopets.com/items/6p8sgs69.gif"
update_style "Grey", "Xweetok", "https://images.neopets.com/items/bge9vp5e.gif"
```

app/models/alt_style.rb

@@ -11,6 +11,7 @@ class AltStyle < ApplicationRecord
   validates :body_id, presence: true
 
   before_create :infer_series_name
+  before_create :infer_thumbnail_url
 
   scope :matching_name, ->(series_name, color_name, species_name) {
     color = Color.find_by_name!(color_name)
@@ -41,22 +42,6 @@ class AltStyle < ApplicationRecord
     "#{series_name} #{color.human_name}"
   end
 
-  THUMBNAIL_URL_TEMPLATE = Addressable::Template.new(
-    "https://images.neopets.com/items/{series}_{color}_{species}.gif"
-  )
-  DEFAULT_THUMBNAIL_URL = "https://images.neopets.com/items/mall_bg_circle.gif"
-  def thumbnail_url
-    return DEFAULT_THUMBNAIL_URL unless has_real_series_name?
-
-    # HACK: We're assuming this is the format long-term! But if it changes, we
-    # may need to add it as a database field instead.
-    THUMBNAIL_URL_TEMPLATE.expand(
-      series: series_name.gsub(/\s+/, '').downcase,
-      color: color.name.gsub(/\s+/, '').downcase,
-      species: species.name.gsub(/\s+/, '').downcase,
-    ).to_s
-  end
-
   def preview_image_url
     swf_asset = swf_assets.first
     return nil if swf_asset.nil?
@@ -91,6 +76,26 @@ class AltStyle < ApplicationRecord
     end
   end
 
+  # At time of writing, most batches of Alt Styles thumbnails used a simple
+  # pattern for the item thumbnail URL, but that's not always the case anymore.
+  # For now, let's keep using this format as the default value when creating a
+  # new Alt Style, but the database field can be manually overridden as needed!
+  THUMBNAIL_URL_TEMPLATE = Addressable::Template.new(
+    "https://images.neopets.com/items/{series}_{color}_{species}.gif"
+  )
+  DEFAULT_THUMBNAIL_URL = "https://images.neopets.com/items/mall_bg_circle.gif"
+  def infer_thumbnail_url
+    if has_real_series_name?
+      self.thumbnail_url = THUMBNAIL_URL_TEMPLATE.expand(
+        series: series_name.gsub(/\s+/, '').downcase,
+        color: color.name.gsub(/\s+/, '').downcase,
+        species: species.name.gsub(/\s+/, '').downcase,
+      ).to_s
+    else
+      self.thumbnail_url = DEFAULT_THUMBNAIL_URL
+    end
+  end
+
   # For convenience in the console!
   def self.find_by_name(color_name, species_name)
     color = Color.find_by_name(color_name)

db/migrate/20240616001002_add_thumbnail_url_to_alt_styles.rb

@@ -0,0 +1,14 @@
+class AddThumbnailUrlToAltStyles < ActiveRecord::Migration[7.1]
+  def change
+    add_column :alt_styles, :thumbnail_url, :string, null: false
+
+    reversible do |direction|
+      direction.up do
+        AltStyle.find_each do |alt_style|
+          alt_style.infer_thumbnail_url
+          alt_style.save!
+        end
+      end
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2024_06_08_022149) do
+ActiveRecord::Schema[7.1].define(version: 2024_06_16_001002) do
   create_table "alt_styles", charset: "utf8mb4", collation: "utf8mb4_unicode_520_ci", force: :cascade do |t|
     t.integer "species_id", null: false
     t.integer "color_id", null: false
@@ -18,6 +18,7 @@ ActiveRecord::Schema[7.1].define(version: 2024_06_08_022149) do
     t.datetime "created_at", precision: nil, null: false
     t.datetime "updated_at", precision: nil, null: false
     t.string "series_name"
+    t.string "thumbnail_url", null: false
     t.index ["color_id"], name: "index_alt_styles_on_color_id"
     t.index ["species_id"], name: "index_alt_styles_on_species_id"
   end