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Rails Email Domain Validation: Restrict to Approved Domains

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                  class User < ApplicationRecord
  validates :email, presence: true, email_domain: true
end

                  class EmailDomainValidator < ActiveModel::EachValidator
  ALLOWED_DOMAINS = ["example.com", "mycompany.com"]

  def validate_each(record, attribute, value)
    domain = value.split("@").last
    
    record.errors.add(attribute, "must be from an approved domain") if ALLOWED_DOMAINS.exclude?(domain)
  end
end

This custom EmailDomainValidator ensures users can only register with emails from approved domains. It extracts the domain from the email and checks it against a predefined list. The User model applies this validation. A challenge is making the allowed domains dynamic—moving them to a database or environment config solves this. This validation enhances security and prevents unauthorized sign-ups.

Martin Sojka

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Rails Email Domain Validation: Restrict to Approved Domains

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More from Martin Sojka