Remove "<New?>" from pet style search filters

When there's an unlabeled style, previously we'd include the placeholder
value "<New?>" in the search dropdown, even though we don't actually
support searching by it.

Now, we don't! I did this in part by just refactoring how we look this
stuff up, with queries that don't load *all* alt styles into memory,
which will help perf a bit as more of them are released.

app/controllers/alt_styles_controller.rb

@@ -2,20 +2,15 @@ class AltStylesController < ApplicationController
 	before_action :support_staff_only, except: [:index]
 
 	def index
-		@all_alt_styles = AltStyle.includes(:species, :color)
-
-		@all_colors = @all_alt_styles.map(&:color).uniq.sort_by(&:name)
-		@all_species = @all_alt_styles.map(&:species).uniq.sort_by(&:name)
-
-		@all_series_names = @all_alt_styles.map(&:series_name).uniq.sort
-		@all_color_names = @all_colors.map(&:human_name)
-		@all_species_names = @all_species.map(&:human_name)
+		@all_series_names = AltStyle.all_series_names
+		@all_color_names = AltStyle.all_supported_colors.map(&:human_name).sort
+		@all_species_names = AltStyle.all_supported_species.map(&:human_name).sort
 
 		@series_name = params[:series]
 		@color = find_color
 		@species = find_species
 
-		@alt_styles = @all_alt_styles.includes(:swf_assets)
+		@alt_styles = AltStyle.includes(:color, :species, :swf_assets)
 		@alt_styles.where!(series_name: @series_name) if @series_name.present?
 		@alt_styles.merge!(@color.alt_styles) if @color
 		@alt_styles.merge!(@species.alt_styles) if @species

app/models/alt_style.rb

@@ -101,6 +101,18 @@ class AltStyle < ApplicationRecord
     "<New?>"
   end
 
+  def self.all_series_names
+    distinct.where.not(series_name: nil).pluck(:series_name).sort
+  end
+
+  def self.all_supported_colors
+    Color.find(distinct.pluck(:color_id))
+  end
+
+  def self.all_supported_species
+    Species.find(distinct.pluck(:species_id))
+  end
+
   # For convenience in the console!
   def self.find_by_name(color_name, species_name)
     color = Color.find_by_name(color_name)