Use enum validation instead of ArgumentError rescue for List replies policy check (#34452)

app/controllers/api/v1/lists_controller.rb

@@ -7,10 +7,6 @@ class Api::V1::ListsController < Api::BaseController
   before_action :require_user!
   before_action :set_list, except: [:index, :create]
 
-  rescue_from ArgumentError do |e|
-    render json: { error: e.to_s }, status: 422
-  end
-
   def index
     @lists = List.where(account: current_account).all
     render json: @lists, each_serializer: REST::ListSerializer

app/models/list.rb

@@ -18,7 +18,7 @@ class List < ApplicationRecord
 
   PER_ACCOUNT_LIMIT = 50
 
-  enum :replies_policy, { list: 0, followed: 1, none: 2 }, prefix: :show
+  enum :replies_policy, { list: 0, followed: 1, none: 2 }, prefix: :show, validate: true
 
   belongs_to :account