[Rails] SQL constraints through migrations

Hi,

I have to add contraints (CHECK) on a sql table through rails migration. How should I? I googled and got to know about using something as follows,

def self.up
    execute "ALTER TABLE table_name ADD CONSTRAINT check_constraint_name CHECK (check_column_name IN (1, 2, 3) )"
end

But am not sure if it appropriate to implement it this way or if there is any better method to get it done?

Regards,
Sumit

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