Ruby on Rails - .distinct (or .uniq) ruby on rails- ruby on rails tutorial - rails guides - rails tutorial - ruby rails



  • If we want to remove duplicates from a result, we can use .distinct():
Customers.select(:country).distinct
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This queries the database given below:

SELECT DISTINCT "customers"."country" FROM "customers"
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  • .uniq() has the same effect. With Rails 5.0 it got deprecated and it will be removed from Rails with version 5.1.
  • The reason is, that the word unique doesn't have the same meaning as distinct and it can be misleading.
  • Furthermore distinct is closer to the SQL syntax.

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