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how can i use break in ruby on rails model

what is the best way to not create/save if exist? i have the following in my models

class Censu < ApplicationRecord
    before_create :check_if_exist


    def check_if_exist
       break if ItemsCensu.exists?(year: @year)
            puts  "Εχεις κανει απογραφη για την χρονια #{@year}"

    end
end

i try render:index but still not work, also break

if i put break i have the following error

Invalid break so how can i stop the create if the year exist? and put the puts message as an alert or error?

just change break with return

class Censu < ApplicationRecord
    before_create :check_if_exist

    def check_if_exist
       return if ItemsCensu.exists?(year: @year)

       // your other code here
    end
end

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