added fixes to allow actionmailer test to pass

app/helpers/react_on_rails_helper.rb

@@ -343,8 +343,8 @@ def initialize_redux_stores
   # second parameter passed to both component and store generator functions.
   def rails_context(server_side:)
     @rails_context ||= begin
-      # result = {}
-      # unless request.nil?
+      result = {}
+      unless request.nil?
         # Using Addressable instead of standard URI to better deal with
         # non-ASCII characters (see https://github.com/shakacode/react_on_rails/pull/405)
         uri = Addressable::URI.parse(request.original_url)
@@ -365,11 +365,11 @@ def rails_context(server_side:)
           i18nDefaultLocale: I18n.default_locale,
           httpAcceptLanguage: request.env["HTTP_ACCEPT_LANGUAGE"]
         }
-      # end
-      # if ReactOnRails.configuration.rendering_extension
-      #   custom_context = ReactOnRails.configuration.rendering_extension.custom_context(self)
-      #   result.merge!(custom_context) if custom_context
-      # end
+      end
+      if ReactOnRails.configuration.rendering_extension
+        custom_context = ReactOnRails.configuration.rendering_extension.custom_context(self)
+        result.merge!(custom_context) if custom_context
+      end
       result
     end
 

spec/dummy/app/views/dummy_mailer/hello_email.html.erb

@@ -1,3 +1,7 @@
 Someone emailed this to you:
 
-<%= react_component("HelloWorld", props: {}, prerender: true) %>
+<%= react_component("HelloWorld", props: {
+    helloWorldData: {
+        name: "Mr. Mailing Server Side Rendering"
+    }
+}, prerender: true) %>

spec/dummy/config/initializers/react_on_rails.rb

@@ -2,9 +2,14 @@ module RenderingExtension
   # Return a Hash that contains custom values from the view context that will get passed to
   # all calls to react_component and redux_store for rendering
   def self.custom_context(view_context)
-    {
-      somethingUseful: view_context.session[:something_useful]
-    }
+    result = {}
+    begin
+      result = {
+        somethingUseful: view_context.session[:something_useful]
+      }
+    rescue
+    end
+    result
   end
 end
 

spec/dummy/spec/requests/server_render_check_spec.rb

@@ -62,6 +62,7 @@
     it 'sends email okay' do
       mail = DummyMailer.hello_email
       expect(mail.subject).to match 'mail'
+      expect(mail.body).to match 'Mr. Mailing Server Side Rendering'
     end
   end