On an old Stack Overflow post
<http://stackoverflow.com/questions/11442733/case-insensitive-uniqueness-validation-in-a-ruby-sequel-migration>
I found this example syntax for using constraints in a migration:
alter_table(:table){add_unique_constraint Sequel.function(:lower, :email)}
It doesn't look like you can put a name on that constraint (in case you
need to drop it later). I searched the code here
<https://github.com/jeremyevans/sequel/blob/master/lib/sequel/extensions/migration.rb>
but
couldn't find an #add_unique_constraint method, which got me wondering
where that comes from.
So: (1) Where is that method defined in the code, and (2) is it possible to
name that constraint?
Thanks!
Andrew
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