Add UUID and granblue_id resolution support

- Create IdResolvable concern for flexible ID lookups
- Update character/summon/weapon controllers to use concern
- Support both UUID and granblue_id in API calls

app/controllers/api/v1/characters_controller.rb

@@ -3,6 +3,8 @@
 module Api
   module V1
     class CharactersController < Api::V1::ApiController
+      include IdResolvable
+
       before_action :set
 
       def show
@@ -12,7 +14,8 @@ module Api
       private
 
       def set
-        @character = Character.where(granblue_id: params[:id]).first
+        @character = find_by_any_id(Character, params[:id])
+        render_not_found_response('character') unless @character
       end
     end
   end

app/controllers/api/v1/summons_controller.rb

@@ -3,6 +3,8 @@
 module Api
   module V1
     class SummonsController < Api::V1::ApiController
+      include IdResolvable
+
       before_action :set
 
       def show
@@ -12,7 +14,8 @@ module Api
       private
 
       def set
-        @summon = Summon.where(granblue_id: params[:id]).first
+        @summon = find_by_any_id(Summon, params[:id])
+        render_not_found_response('summon') unless @summon
       end
     end
   end

app/controllers/api/v1/weapons_controller.rb

@@ -3,6 +3,8 @@
 module Api
   module V1
     class WeaponsController < Api::V1::ApiController
+      include IdResolvable
+
       before_action :set
 
       def show
@@ -12,7 +14,8 @@ module Api
       private
 
       def set
-        @weapon = Weapon.where(granblue_id: params[:id]).first
+        @weapon = find_by_any_id(Weapon, params[:id])
+        render_not_found_response('weapon') unless @weapon
       end
     end
   end

app/controllers/concerns/id_resolvable.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module IdResolvable
+  extend ActiveSupport::Concern
+
+  UUID_REGEX = /\A[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\z/i
+
+  private
+
+  def uuid_format?(id)
+    id.to_s.match?(UUID_REGEX)
+  end
+
+  def find_by_any_id(model_class, id)
+    return nil if id.blank?
+
+    if uuid_format?(id)
+      model_class.find_by(id: id)
+    else
+      model_class.find_by(granblue_id: id)
+    end
+  end
+end