method
distinct
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Class: CollectionProxy
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distinct()
public
Specifies whether the records should be unique or not.
class Person < ActiveRecord::Base has_many :pets end person.pets.select(:name) # => [ # #<Pet name: "Fancy-Fancy">, # #<Pet name: "Fancy-Fancy"> # ] person.pets.select(:name).distinct # => [#<Pet name: "Fancy-Fancy">]