Add letter-opener

Gemfile

@@ -77,6 +77,10 @@ group :development do
   # Use console on exceptions pages [https://github.com/rails/web-console]
   gem "web-console"
 
+  # Preview emails in the browser [https://github.com/ryanb/letter_opener]
+  gem "letter_opener"
+  gem "letter_opener_web", "~> 3.0"
+
   # Rack Mini Profiler [https://github.com/MiniProfiler/rack-mini-profiler]
   gem "rack-mini-profiler"
   # For memory profiling via RMP

Gemfile.lock

@@ -115,6 +115,8 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
+    childprocess (5.1.0)
+      logger (~> 1.5)
     concurrent-ruby (1.3.5)
     connection_pool (2.5.0)
     crass (1.0.6)
@@ -208,6 +210,17 @@ GEM
       thor (~> 1.3)
       zeitwerk (>= 2.6.18, < 3.0)
     language_server-protocol (3.17.0.4)
+    launchy (3.1.1)
+      addressable (~> 2.8)
+      childprocess (~> 5.0)
+      logger (~> 1.6)
+    letter_opener (1.10.0)
+      launchy (>= 2.2, < 4)
+    letter_opener_web (3.0.0)
+      actionmailer (>= 6.1)
+      letter_opener (~> 1.9)
+      railties (>= 6.1)
+      rexml
     lint_roller (1.1.0)
     llhttp-ffi (0.5.0)
       ffi-compiler (~> 1.0)
@@ -472,6 +485,8 @@ DEPENDENCIES
   importmap-rails
   jbuilder
   kamal
+  letter_opener
+  letter_opener_web (~> 3.0)
   memory_profiler
   paper_trail
   pg

config/routes.rb

@@ -7,6 +7,12 @@ class AdminConstraint
   end
 end
 
+class DevelopmentConstraint
+  def self.matches?(request)
+    Rails.env.development?
+  end
+end
+
 Rails.application.routes.draw do
   constraints AdminConstraint do
     mount Avo::Engine, at: Avo.configuration.root_path
@@ -16,6 +22,11 @@ Rails.application.routes.draw do
   end
   get "/stop_impersonating", to: "sessions#stop_impersonating", as: :stop_impersonating
 
+  constraints DevelopmentConstraint do
+    # Preview emails in the browser [https://github.com/ryanb/letter_opener]
+    mount LetterOpenerWeb::Engine, at: "/letter_opener", as: :letter_opener
+  end
+
   # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.
   # Can be used by load balancers and uptime monitors to verify that the app is live.
   get "up" => "rails/health#show", as: :rails_health_check