Answer: A migration to add unique constraint to a combination of columns

answer re: A migration to add unique constraint to a combination of columns

Dec 3 '19

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For completeness sake, and to avoid confusion here are 3 ways of doing the same thing:
Adding a named unique constraint to a combination of columns in Rails 5.2+

Let's say we have Locations table that belongs to an advertiser and has column reference_code and you only want 1 reference…

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