Don't ignore constraints in redirect routes

402c2af550
introduced a regression that caused any constraints added to redirect routes
to be ignored.

Fixes #16605

actionpack/CHANGELOG.md

@@ -1,3 +1,10 @@
+*   Fix bug where the router would ignore any constraints added to redirect
+    routes.
+
+    Fixes #16605.
+
+    *Agis Anastasopoulos*
+
 *   Allow `config.action_dispatch.trusted_proxies` to accept an IPAddr object.
 
     Example:

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -241,8 +241,6 @@ def add_request_method(via, conditions)
           end
 
           def app(blocks)
-            return to if Redirect === to
-
             if to.respond_to?(:call)
               Constraints.new(to, blocks, false)
             else

actionpack/test/dispatch/routing_test.rb

@@ -14,6 +14,12 @@ def self.matches?(request)
     end
   end
 
+  class GrumpyRestrictor
+    def self.matches?(request)
+      false
+    end
+  end
+
   class YoutubeFavoritesRedirector
     def self.call(params, request)
       "http://www.youtube.com/watch?v=#{params[:youtube_id]}"
@@ -89,6 +95,24 @@ def test_namespace_redirect
     verify_redirect 'http://www.example.com/private/index'
   end
 
+  def test_redirect_with_failing_constraint
+    draw do
+      get 'hi', to: redirect("/foo"), constraints: ::TestRoutingMapper::GrumpyRestrictor
+    end
+
+    get '/hi'
+    assert_equal 404, status
+  end
+
+  def test_redirect_with_passing_constraint
+    draw do
+      get 'hi', to: redirect("/foo"), constraints: ->(req) { true }
+    end
+
+    get '/hi'
+    assert_equal 301, status
+  end
+
   def test_namespace_with_controller_segment
     assert_raise(ArgumentError) do
       draw do