Merge pull request #45935 from the-spectator/add_bcc_to_mailer_preview

Show BCC field in mailer preview

railties/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Show BCC recipients when present in Action Mailer previews.
+
+    *Akshay Birajdar*
+
 *   Extend `routes --grep` to also filter routes by matching against path.
 
     Example:

railties/lib/rails/templates/rails/mailers/email.html.erb

@@ -80,6 +80,11 @@
       <dd id="cc"><%= @email.header['cc'] %></dd>
     <% end %>
 
+    <% if @email.bcc %>
+      <dt>BCC:</dt>
+      <dd id="bcc"><%= @email.header['bcc'] %></dd>
+    <% end %>
+
     <dt>Date:</dt>
     <dd id="date"><%= Time.current.rfc2822 %></dd>
 

railties/test/application/mailer_previews_test.rb

@@ -877,6 +877,36 @@ module ApplicationTests
       assert_match "<title>Mailer Preview for notifier#foo</title>", last_response.body
     end
 
+    test "mailer preview sender tags" do
+      mailer "notifier", <<-RUBY
+        class Notifier < ActionMailer::Base
+          default from: "from@example.com"
+          def foo
+            mail to: "to@example.org", cc: "cc@example.com", bcc: "bcc@example.com"
+          end
+        end
+      RUBY
+
+      text_template "notifier/foo", <<-RUBY
+        Hello, World!
+      RUBY
+
+      mailer_preview "notifier", <<-RUBY
+        class NotifierPreview < ActionMailer::Preview
+          def foo
+            Notifier.foo
+          end
+        end
+      RUBY
+
+      app("development")
+
+      get "/rails/mailers/notifier/foo"
+      assert_match "<dd id=\"to\">to@example.org</dd>", last_response.body
+      assert_match "<dd id=\"cc\">cc@example.com</dd>", last_response.body
+      assert_match "<dd id=\"bcc\">bcc@example.com</dd>", last_response.body
+    end
+
     private
       def build_app
         super