Filter search in wardrobe-2020 by alt styles!

Yay, we finally added it, the part where we include the appearance data
for the items based on both the species/color and the alt style! Now,
switching to Faerie Acara correctly filters the search only to items
that would fit (I think literally just only body_id=0 items right now,
but we're not banking on that!)

app/controllers/items_controller.rb

@@ -121,11 +121,16 @@ class ItemsController < ApplicationController
   def load_appearances
     appearance_params = params[:with_appearances_for]
     return {} if appearance_params.blank?
-    raise NotImplementedError if appearance_params[:alt_style_id].present?
+    
+    if appearance_params[:alt_style_id].present?
+      target = Item::Search::Query.load_alt_style_by_id(
+        appearance_params[:alt_style_id])
+    else
+      target = Item::Search::Query.load_pet_type_by_color_and_species(
+        appearance_params[:color_id], appearance_params[:species_id])
+    end
 
-    pet_type = Item::Search::Query.load_pet_type_by_color_and_species(
-      appearance_params[:color_id], appearance_params[:species_id])
-    pet_type.appearances_for(@items.map(&:id), swf_asset_includes: [:zone])
+    target.appearances_for(@items.map(&:id), swf_asset_includes: [:zone])
   end
   
   def search_error(e)

app/models/alt_style.rb

@@ -49,6 +49,11 @@ class AltStyle < ApplicationRecord
     swf_asset.image_url
   end
 
+  # Given a list of item IDs, return how they look on this alt style.
+  def appearances_for(item_ids, ...)
+    Item.appearances_for(item_ids, self, ...)
+  end
+
   def biology=(biology)
     # TODO: This is very similar to what `PetState` does, but like… much much
     # more compact? Idk if I'm missing something, or if I was just that much

app/models/item.rb

@@ -495,6 +495,34 @@ class Item < ApplicationRecord
     end
   end
 
+  # Given a list of item IDs, return how they look on the given target (either
+  # a pet type or an alt style).
+  def self.appearances_for(item_ids, target, swf_asset_includes: [])
+    # First, load all the relationships for these items that also fit this
+    # body.
+    relationships = ParentSwfAssetRelationship.
+      includes(swf_asset: swf_asset_includes).
+      where(parent_type: "Item", parent_id: item_ids).
+      where(swf_asset: {body_id: [target.body_id, 0]})
+
+    pet_type_body = Appearance::Body.new(target.body_id, target.species)
+    all_pets_body = Appearance::Body.new(0, nil)
+
+    # Then, convert this into a hash from item ID to SWF assets.
+    assets_by_item_id = relationships.group_by(&:parent_id).
+      transform_values { |rels| rels.map(&:swf_asset) }
+
+    # Finally, for each item, return an appearance—even if it's empty!
+    item_ids.to_h do |item_id|
+      assets = assets_by_item_id.fetch(item_id, [])
+
+      fits_all_pets = assets.present? && assets.all? { |a| a.body_id == 0 }
+      body = fits_all_pets ? all_pets_body : pet_type_body
+
+      [item_id, Appearance.new(body, assets)]
+    end
+  end
+
   def self.all_by_ids_or_children(ids, swf_assets)
     swf_asset_ids = []
     swf_assets_by_id = {}

app/models/pet_type.rb

@@ -169,30 +169,9 @@ class PetType < ApplicationRecord
     }.first
   end
 
-  def appearances_for(item_ids, swf_asset_includes: [])
-    # First, load all the relationships for these items that also fit this
-    # body.
-    relationships = ParentSwfAssetRelationship.
-      includes(swf_asset: swf_asset_includes).
-      where(parent_type: "Item", parent_id: item_ids).
-      where(swf_asset: {body_id: [body_id, 0]})
-
-    pet_type_body = Item::Appearance::Body.new(body_id, species)
-    all_pets_body = Item::Appearance::Body.new(0, nil)
-
-    # Then, convert this into a hash from item ID to SWF assets.
-    assets_by_item_id = relationships.group_by(&:parent_id).
-      transform_values { |rels| rels.map(&:swf_asset) }
-
-    # Finally, for each item, return an appearance—even if it's empty!
-    item_ids.to_h do |item_id|
-      assets = assets_by_item_id.fetch(item_id, [])
-
-      fits_all_pets = assets.present? && assets.all? { |a| a.body_id == 0 }
-      body = fits_all_pets ? all_pets_body : pet_type_body
-
-      [item_id, Item::Appearance.new(body, assets)]
-    end
+  # Given a list of item IDs, return how they look on this pet type.
+  def appearances_for(item_ids, ...)
+    Item.appearances_for(item_ids, self, ...)
   end
 
   def self.all_by_ids_or_children(ids, pet_states)