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If LDAP authentication is by username (not email), add to Devise the possibility to login with username:
https://github.com/plataformatec/devise/wiki/How-To:-Allow-users-to-sign-in-using-their-username-or-email-address https://github.com/plataformatec/devise/wiki/How-To:-Allow-users-to-sign_in-using-their-username-or-email-address https://github.com/plataformatec/devise/wiki/How-To:-Allow-users-to-sign-in-with-something-other-than-their-email-address
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Add to Gemfile the gem net-ldap:
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