[WV2] Refactor outfit state params helper

app/helpers/outfits_helper.rb

@@ -66,24 +66,21 @@ module OutfitsHelper
   end
 
   # Generate hidden fields to preserve outfit state in URL params.
-  # Options:
-  #   - exclude_item_id: Item ID to exclude from objects[] array
-  def outfit_state_params(exclude_item_id: nil)
+  # Use the `except` parameter to skip certain fields, e.g. to override
+  # them with specific values, like in the species/color picker.
+  def outfit_state_params(outfit = @outfit, except: [])
     fields = []
 
-    # Preserve species and color
-    fields << hidden_field_tag(:species, params[:species]) if params[:species].present?
-    fields << hidden_field_tag(:color, params[:color]) if params[:color].present?
+    fields << hidden_field_tag(:species, @outfit.species_id) unless except.include?(:species)
+    fields << hidden_field_tag(:color, @outfit.color_id) unless except.include?(:color)
 
-    # Preserve item IDs, optionally excluding one
-    if params[:objects].present?
-      params[:objects].each do |item_id|
-        next if exclude_item_id && item_id.to_s == exclude_item_id.to_s
-        fields << hidden_field_tag("objects[]", item_id)
+    unless except.include?(:worn_items)
+      outfit.worn_items.each do |item|
+        fields << hidden_field_tag('objects[]', item.id)
       end
     end
 
-    safe_join(fields)
+    safe_join fields
   end
 
   def outfit_viewer(...)

app/models/outfit.rb

@@ -281,4 +281,19 @@ class Outfit < ApplicationRecord
       i += 1
     end
   end
+
+  # When creating Outfit copies, include items. They're considered a basic
+  # property of the record, in the grand scheme of things, despite being
+  # associations.
+  def dup
+    super.tap do |outfit|
+      outfit.worn_item_ids = self.worn_item_ids
+      outfit.closeted_item_ids = self.closeted_item_ids
+    end
+  end
+
+  # Create a copy of this outfit, but *not* wearing the given item.
+  def without_item(item)
+    dup.tap { |o| o.worn_items.delete(item) }
+  end
 end

app/views/outfits/new_v2.html.haml

@@ -30,7 +30,7 @@
 
         %species-color-picker
           = form_with url: wardrobe_v2_path, method: :get do |f|
-            = outfit_state_params
+            = outfit_state_params except: [:color, :species]
             = select_tag :color,
               options_from_collection_for_select(@colors, "id", "human_name",
                 @selected_color&.id),
@@ -63,4 +63,4 @@
                           = render "items/badges/first_seen", item: item
                       = button_to wardrobe_v2_path, method: :get, class: "item-remove-button", title: "Remove #{item.name}", "aria-label": "Remove #{item.name}" do
                         ❌
-                        = outfit_state_params exclude_item_id: item.id
+                        = outfit_state_params @outfit.without_item(item)