Comments (2)
If it's just 2 places (create and update), I usually don't bother to gather this logic into a single spot, just duplicate the uniqueness validation. If becomes needed somewhere else -- look at why. If it's a totally unrelated API endpoint, then duplicate it there too. If it's something related to customer creation/update, then add a domain service and move that logic there (though most likely, you'd need to move more than just uniqueness validation).
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Thank you for your insight!
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