From 24c47140e5d2e484b49796c934a8c1efb2a434b5 Mon Sep 17 00:00:00 2001
From: Vasiliy Ermolovich <younash@gmail.com>
Date: Fri, 15 Nov 2024 20:16:25 +0100
Subject: [PATCH] Make Devise.mappings work with lazy loaded routes.

Starting from Rails 8.0, routes are lazy-loaded by default in test and development environments.
However, Devise's mappings are built during the routes loading phase.
To ensure it works correctly, we need to load the routes first before accessing @@mappings.
---
 CHANGELOG.md  | 6 ++++--
 lib/devise.rb | 8 +++++++-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 04328b76..0adbeb67 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,16 +6,18 @@
   * Remove `SecretKeyFinder` and use `app.secret_key_base` as the default secret key for `Devise.secret_key` if a custom `Devise.secret_key` is not provided.
 
     This is potentially a breaking change because Devise previously used the following order to find a secret key:
-    
+
     ```
     app.credentials.secret_key_base > app.secrets.secret_key_base > application.config.secret_key_base > application.secret_key_base
     ```
-    
+
     Now, it always uses `application.secret_key_base`. Make sure you're using the same secret key after the upgrade; otherwise, previously generated tokens for `recoverable`, `lockable`, and `confirmable` will be invalid.
     https://github.com/heartcombo/devise/pull/5645
 
 * enhancements
   * Removed deprecations warning output for `Devise::Models::Authenticatable::BLACKLIST_FOR_SERIALIZATION` (@soartec-lab)
+  * Add Rails 8 support.
+    - Routes are lazy-loaded by default in test and development environments now so Devise loads them before `Devise.mappings` call.
 
 Please check [4-stable](https://github.com/heartcombo/devise/blob/4-stable/CHANGELOG.md)
 for previous changes.
diff --git a/lib/devise.rb b/lib/devise.rb
index 3d9dc788..5b7417ed 100644
--- a/lib/devise.rb
+++ b/lib/devise.rb
@@ -274,8 +274,14 @@ module Devise
   # PRIVATE CONFIGURATION
 
   # Store scopes mappings.
-  mattr_reader :mappings
   @@mappings = {}
+  def self.mappings
+    # Starting from Rails 8.0, routes are lazy-loaded by default in test and development environments.
+    # However, Devise's mappings are built during the routes loading phase.
+    # To ensure it works correctly, we need to load the routes first before accessing @@mappings.
+    Rails.application.try(:reload_routes_unless_loaded)
+    @@mappings
+  end
 
   # OmniAuth configurations.
   mattr_reader :omniauth_configs