From 70f7ebdf560559e57a4ed21f295a4aa1c47e7604 Mon Sep 17 00:00:00 2001
From: Apostolos Stergiakis <astergiakis@epignosishq.com>
Date: Mon, 9 Nov 2026 09:47:26 +0200
Subject: [PATCH] Fix uninitialized constant CustomDeviseMailer when inviting a
 user in a cold-loaded process (#5745)

Bump devise_invitable 2.0.13 -> 2.0.14. 2.0.13's :action_mailer load
hook resolved Devise.mailer while CustomDeviseMailer was still being
autoloaded, so the first invite in a non-eager-loaded process failed.
2.0.14 (scambra/devise_invitable#929) contains only that fix.

Adds a spec that boots a fresh non-eager-loaded process, since CI
eager-loads and hides the failure.

Resolves #5745
---
 Gemfile.lock                               |  2 +-
 spec/lib/custom_devise_mailer_load_spec.rb | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 spec/lib/custom_devise_mailer_load_spec.rb

diff --git a/Gemfile.lock b/Gemfile.lock
index c83ef6b9fd..283cddcf82 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -202,7 +202,7 @@ GEM
       railties (>= 7.0)
       responders
       warden (~> 1.2.3)
-    devise_invitable (2.0.13)
+    devise_invitable (2.0.14)
       actionmailer (>= 5.0)
       devise (>= 4.6)
     diff-lcs (1.6.2)
diff --git a/spec/lib/custom_devise_mailer_load_spec.rb b/spec/lib/custom_devise_mailer_load_spec.rb
new file mode 100644
index 0000000000..ad6fac4cec
--- /dev/null
+++ b/spec/lib/custom_devise_mailer_load_spec.rb
@@ -0,0 +1,16 @@
+require "open3"
+
+# Autoloading CustomDeviseMailer in a fresh process used to raise
+# "uninitialized constant CustomDeviseMailer" (#5745): devise_invitable 2.0.13's
+# :action_mailer load hook resolved Devise.mailer while the class was still loading
+# (fixed in 2.0.14, scambra/devise_invitable#929).
+# CI eager-loads, which hides it, so this boots a separate non-eager-loaded process.
+RSpec.describe "CustomDeviseMailer cold load" do
+  it "resolves Devise.mailer when autoloaded first in a fresh process" do
+    env = {"RAILS_ENV" => "test", "CI" => nil}
+    output, status = Open3.capture2e(env, "bin/rails", "runner", "puts Devise.mailer.name", chdir: Rails.root.to_s)
+
+    expect(status).to be_success, output
+    expect(output.lines.map(&:strip)).to include("CustomDeviseMailer")
+  end
+end