Post History

How to fix NameError (undefined local variable or method `background' for #<#<Class) in avatar_helper.rb?

I'm setting up a QPixel instance. I just created a new category and I realized in the `rails s` output a NameError in avatar_helper.rb:

```
Started GET "/users/1/avatar/40.png" for 127.0.0.1 at 2022-01-12 22:37:01 +0100
Started GET "/assets/codidact.png" for 127.0.0.1 at 2022-01-12 22:37:01 +0100
Processing by UsersController#avatar as PNG
  Parameters: {"id"=>"1", "size"=>"40"}
  Host localhost:3000, community #1 (Dev Community)
  User Load (4.4ms)  SELECT  `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1
  CommunityUser Load (5.6ms)  SELECT  `community_users`.* FROM `community_users` WHERE `community_users`.`user_id` = 1 AND `community_users`.`community_id` = 1 LIMIT 1
  User 1 (aaa) signed in
  ....
NameError (undefined local variable or method `background' for #<#<Class:0x00007f2dad266998>:0x00007f2dacaeec38>):

app/helpers/users/avatar_helper.rb:28:in `block in user_auto_avatar'
config/initializers/namespaced_cache.rb:11:in `block (2 levels) in <class:NamespacedEnvCache>'
app/helpers/users/avatar_helper.rb:23:in `user_auto_avatar'
app/controllers/users_controller.rb:474:in `block (2 levels) in avatar'
app/controllers/users_controller.rb:471:in `avatar'
Processing by ErrorsController#error as PNG
  Parameters: {"id"=>"1", "size"=>"40"}
  Host localhost:3000, community #1 (Dev Community)
  User 1 (aaa) signed in
  ...
Completed 500 Internal Server Error in 214ms (Views: 126.5ms | ActiveRecord: 25.9ms)
```

I haven't set an avatar yet and the page output looks fine to (no error message visible).

Is it critical? Should I do something?