UX: Include group name in email when group is invited to a PM.

https://meta.discourse.org/t/xyz-invited-you-to-a-message-but-really-invited-a-group-im-in/65996

app/controllers/admin/email_templates_controller.rb

@@ -27,6 +27,7 @@ class Admin::EmailTemplatesController < Admin::AdminController
                      "user_notifications.set_password", "user_notifications.signup",
                      "user_notifications.signup_after_approval",
                      "user_notifications.user_invited_to_private_message_pm",
+                     "user_notifications.user_invited_to_private_message_pm_group",
                      "user_notifications.user_invited_to_topic", "user_notifications.user_mentioned",
                      "user_notifications.user_posted", "user_notifications.user_posted_pm",
                      "user_notifications.user_quoted", "user_notifications.user_replied",

app/mailers/user_notifications.rb

@@ -311,7 +311,7 @@ class UserNotifications < ActionMailer::Base
     allow_reply_by_email = opts[:allow_reply_by_email] unless user.suspended?
     original_username = notification_data[:original_username] || notification_data[:display_username]
 
-    send_notification_email(
+    email_options = {
       title: notification_data[:topic_title],
       post: post,
       username: original_username,
@@ -323,7 +323,13 @@ class UserNotifications < ActionMailer::Base
       notification_type: notification_type,
       use_invite_template: opts[:use_invite_template],
       user: user
-    )
+    }
+
+    if group_id = notification_data[:group_id]
+      email_options[:group_name] = Group.find_by(id: group_id)&.name
+    end
+
+    send_notification_email(email_options)
   end
 
   def send_notification_email(opts)
@@ -337,12 +343,18 @@ class UserNotifications < ActionMailer::Base
     from_alias = opts[:from_alias]
     notification_type = opts[:notification_type]
     user = opts[:user]
+    group_name = opts[:group_name]
     locale = user_locale(user)
 
     template = "user_notifications.user_#{notification_type}"
     if post.topic.private_message?
       template << "_pm"
-      template << "_staged" if user.staged?
+
+      if group_name
+        template << "_group"
+      elsif user.staged
+        template << "_staged"
+      end
     end
 
     # category name
@@ -376,17 +388,33 @@ class UserNotifications < ActionMailer::Base
       end
     end
 
-    translation_override_exists = TranslationOverride.where(locale: SiteSetting.default_locale, translation_key: "#{template}.text_body_template").exists?
+    translation_override_exists = TranslationOverride.where(
+      locale: SiteSetting.default_locale,
+      translation_key: "#{template}.text_body_template"
+    ).exists?
 
     if opts[:use_invite_template]
+      invite_template = "user_notifications.invited"
+      invite_template << "_group" if group_name
+
+      invite_template <<
         if post.topic.private_message?
-        invite_template = "user_notifications.invited_to_private_message_body"
+          "_to_private_message_body"
         else
-        invite_template = "user_notifications.invited_to_topic_body"
+          "_to_topic_body"
         end
+
       topic_excerpt = post.excerpt.tr("\n", " ") if post.is_first_post? && post.excerpt
       topic_excerpt = "" if SiteSetting.private_email?
-      message = I18n.t(invite_template, username: username, topic_title: gsub_emoji_to_unicode(title), topic_excerpt: topic_excerpt, site_title: SiteSetting.title, site_description: SiteSetting.site_description)
+
+      message = I18n.t(invite_template,
+        username: username,
+        group_name: group_name,
+        topic_title: gsub_emoji_to_unicode(title),
+        topic_excerpt: topic_excerpt,
+        site_title: SiteSetting.title,
+        site_description: SiteSetting.site_description
+      )
 
       unless translation_override_exists
         html = UserNotificationRenderer.new(Rails.configuration.paths["app/views"]).render(
@@ -434,6 +462,7 @@ class UserNotifications < ActionMailer::Base
       topic_id: post.topic_id,
       context: context,
       username: username,
+      group_name: group_name,
       add_unsubscribe_link: !user.staged,
       mailing_list_mode: user.user_option.mailing_list_mode,
       unsubscribe_url: post.unsubscribe_url(user),

app/models/topic.rb

@@ -723,6 +723,8 @@ SQL
       PostAlerter.new.after_save_post(last_post)
       add_small_action(user, "invited_group", group.name)
 
+      group_id = group.id
+
       group.users.where(
         "group_users.notification_level > ?", NotificationLevels.all[:muted]
       ).find_each do |u|
@@ -733,7 +735,8 @@ SQL
           post_number: 1,
           data: {
             topic_title: self.title,
-            display_username: user.username
+            display_username: user.username,
+            group_id: group_id
           }.to_json
         )
       end

config/locales/server.en.yml

@@ -2424,6 +2424,17 @@ en:
 
     posted_by: "Posted by %{username} on %{post_date}"
 
+    invited_group_to_private_message_body: |
+      %{username} invited @%{group_name} to a message
+
+      > #### %{topic_title}
+      >
+      > %{topic_excerpt}
+
+      at
+
+      > %{site_title} -- %{site_description}
+
     invited_to_private_message_body: |
       %{username} invited you to a message
 
@@ -2446,6 +2457,16 @@ en:
 
       > %{site_title} -- %{site_description}
 
+    user_invited_to_private_message_pm_group:
+      title: "User Invited Group to PM"
+      subject_template: "[%{email_prefix}] %{username} invited @%{group_name} to a message '%{topic_title}'"
+      text_body_template: |
+        %{header_instructions}
+
+        %{message}
+
+        %{respond_instructions}
+
     user_invited_to_private_message_pm:
       title: "User Invited to PM"
       subject_template: "[%{email_prefix}] %{username} invited you to a message '%{topic_title}'"

spec/mailers/user_notifications_spec.rb

@@ -468,6 +468,7 @@ describe UserNotifications do
   shared_examples "notification email building" do
     let(:post) { Fabricate(:post, user: user) }
     let(:mail_type) { "user_#{notification_type}"}
+    let(:mail_template) { "user_notifications.#{mail_type}" }
     let(:username) { "walterwhite"}
     let(:notification) do
       Fabricate(:notification,
@@ -488,7 +489,7 @@ describe UserNotifications do
       end
 
       it "has a template" do
-        expects_build_with(has_entry(:template, "user_notifications.#{mail_type}"))
+        expects_build_with(has_entry(:template, mail_template))
       end
 
       it "overrides the html part" do
@@ -549,7 +550,11 @@ describe UserNotifications do
         end
 
         before do
-          TranslationOverride.upsert!("en", "user_notifications.user_#{notification_type}.text_body_template", custom_body)
+          TranslationOverride.upsert!(
+            "en",
+            "#{mail_template}.text_body_template",
+            custom_body
+          )
         end
 
         it "shouldn't use the default html_override" do
@@ -598,6 +603,33 @@ describe UserNotifications do
   describe "user invited to a private message" do
     include_examples "notification email building" do
       let(:notification_type) { :invited_to_private_message }
+      let(:post) { Fabricate(:private_message_post) }
+      let(:user) { post.user }
+      let(:mail_template) { "user_notifications.user_#{notification_type}_pm" }
+
+      include_examples "respect for private_email"
+      include_examples "no reply by email"
+      include_examples "sets user locale"
+    end
+  end
+
+  describe "group invited to a private message" do
+    include_examples "notification email building" do
+      let(:notification_type) { :invited_to_private_message }
+      let(:post) { Fabricate(:private_message_post) }
+      let(:user) { post.user }
+      let(:group) { Fabricate(:group) }
+      let(:mail_template) { "user_notifications.user_#{notification_type}_pm_group" }
+
+      before do
+        notification.data_hash[:group_id] = group.id
+        notification.save!
+      end
+
+      it "should include the group name" do
+        expects_build_with(has_entry(:group_name, group.name))
+      end
+
       include_examples "respect for private_email"
       include_examples "no reply by email"
       include_examples "sets user locale"