NameError: uninitialized constant
Full error message
NameError: uninitialized constant User
Solutionsource: rails-docs \u2197
Rails autoloading (Zeitwerk) couldn't find a constant. 1. File naming: `User` must live in `app/models/user.rb`. Nested: `Admin::User` -> `app/models/admin/user.rb`. 2. Run `bin/rails zeitwerk:check` — it prints exactly which file-constant mapping is wrong. 3. After adding a file, restart the dev server if eager_loading is off.
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