Merge pull request #28244 from ixti/improve/action-mailer-preview-params

Pass request params to ActionMailer::Preview

2 files changed, 24 insertions, 2 deletions

diff --git a/actionmailer/lib/action_mailer/preview.rb b/actionmailer/lib/action_mailer/preview.rb
index b0152aff03..87ba743f3d 100644
--- a/actionmailer/lib/action_mailer/preview.rb
+++ b/actionmailer/lib/action_mailer/preview.rb
@@ -52,6 +52,12 @@ module ActionMailer
   class Preview
     extend ActiveSupport::DescendantsTracker
 
+    attr_reader :params
+
+    def initialize(params = {})
+      @params = params
+    end
+
     class << self
       # Returns all mailer preview classes.
       def all
@@ -62,8 +68,8 @@ module ActionMailer
       # Returns the mail object for the given email name. The registered preview
       # interceptors will be informed so that they can transform the message
       # as they would if the mail was actually being delivered.
-      def call(email)
-        preview = new
+      def call(email, params = {})
+        preview = new(params)
         message = preview.public_send(email)
         inform_preview_interceptors(message)
         message
diff --git a/actionmailer/test/base_test.rb b/actionmailer/test/base_test.rb
index 61960d411d..ebb97078e6 100644
--- a/actionmailer/test/base_test.rb
+++ b/actionmailer/test/base_test.rb
@@ -968,3 +968,19 @@ class BasePreviewInterceptorsTest < ActiveSupport::TestCase
     end
   end
 end
+
+class BasePreviewTest < ActiveSupport::TestCase
+  class BaseMailerPreview < ActionMailer::Preview
+    def welcome
+      BaseMailer.welcome(params)
+    end
+  end
+
+  test "has access to params" do
+    params = { name: "World" }
+
+    assert_called_with(BaseMailer, :welcome, [params]) do
+      BaseMailerPreview.call(:welcome, params)
+    end
+  end
+end