Migrate a XenForo forum to Discourse

selase · February 17, 2025, 4:22pm

That’s pretty much it. The uniqueness check is performed on the downcased and normalized version of the given email address.

github.com/discourse/discourse

app/models/user_email.rb

402ec6bf5


      
          def unique_email
            email_exists =
              if self.normalize_emails?
                self
                  .class
                  .where("lower(email) = ? OR lower(normalized_email) = ?", email, normalized_email)
                  .exists?
              else
                self.class.where("lower(email) = ?", email).exists?
              end
          
            self.errors.add(:email, :taken) if email_exists
          end

We normalize by removing all dots and ignoring everything after + in the username.

github.com/discourse/discourse

app/models/user_email.rb

402ec6bf5


      
          def normalize_email
            self.normalized_email =
              if self.email.present?
                username, domain = self.email.split("@", 2)
                username = username.gsub(".", "").gsub(/\+.*/, "")
                "#{username}@#{domain}"
              end
          end

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Migrate a XenForo forum to Discourse

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