FIX: do not show name in email if name on posts are disabled

app/mailers/user_notifications.rb

@@ -129,7 +129,7 @@ class UserNotifications < ActionMailer::Base
       title: post.topic.title,
       post: post,
       username: post.user.username,
-      from_alias: (SiteSetting.enable_names && !post.user.name.empty?) ? post.user.name : post.user.username,
+      from_alias: (SiteSetting.enable_names && SiteSetting.display_name_on_posts && !post.user.name.empty?) ? post.user.name : post.user.username,
       allow_reply_by_email: true,
       use_site_subject: true,
       add_re_to_subject: true,
@@ -174,7 +174,7 @@ class UserNotifications < ActionMailer::Base
     return unless @post = opts[:post]
 
     user_name = @notification.data_hash[:original_username]
-    if @post && SiteSetting.enable_names
+    if @post && SiteSetting.enable_names && SiteSetting.display_name_on_posts
       user_name = User.find_by(id: @post.user_id).name if !User.find_by(id: @post.user_id).name.empty?
     end
 

spec/mailers/user_notifications_spec.rb

@@ -90,7 +90,8 @@ describe UserNotifications do
     let(:notification) { Fabricate(:notification, user: user) }
 
     it 'generates a correct email' do
-      SiteSetting.stubs(:enable_names).returns(true)
+      SiteSetting.enable_names = true
+      SiteSetting.display_name_on_posts = true
       mail = UserNotifications.user_replied(response.user, post: response, notification: notification)
 
       # from should include full user name
@@ -138,7 +139,7 @@ describe UserNotifications do
     let(:notification) { Fabricate(:notification, user: user, data: {original_username: response_by_user.username}.to_json) }
 
     it 'generates a correct email' do
-      SiteSetting.stubs(:enable_names).returns(false)
+      SiteSetting.enable_names = false
       mail = UserNotifications.user_posted(response.user, post: response, notification: notification)
 
       # from should not include full user name if "show user full names" is disabled
@@ -170,7 +171,7 @@ describe UserNotifications do
     let(:notification) { Fabricate(:notification, user: user, data: {original_username: response_by_user.username}.to_json) }
 
     it 'generates a correct email' do
-      SiteSetting.stubs(:enable_names).returns(true)
+      SiteSetting.enable_names = true
       mail = UserNotifications.user_private_message(response.user, post: response, notification: notification)
 
       # from should include username if full user name is not provided
@@ -267,11 +268,18 @@ describe UserNotifications do
         expects_build_with(has_key(:topic_id))
       end
 
-      it "has a from alias" do
-        SiteSetting.stubs(:enable_names).returns(true)
+      it "should have user name as from_alias" do
+        SiteSetting.enable_names = true
+        SiteSetting.display_name_on_posts = true
         expects_build_with(has_entry(:from_alias, "#{user.name}"))
       end
 
+      it "should not have user name as from_alias if display_name_on_posts is disabled" do
+        SiteSetting.enable_names = false
+        SiteSetting.display_name_on_posts = false
+        expects_build_with(has_entry(:from_alias, "walterwhite"))
+      end
+
       it "should explain how to respond" do
         expects_build_with(Not(has_entry(:include_respond_instructions, false)))
       end