# Deviseでusernameの大文字小文字を区別する方法

```
  # Configure which authentication keys should be case-insensitive.
  # These keys will be downcased upon creating or modifying a user and when used
  # to authenticate or find a user. Default is :email.
  config.case_insensitive_keys = []
```

https://teratail.com/questions/257366

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