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Re:Reducing Memory Usage in Ruby by sam0x17 on Monday January 29, 2018 @04:10PM (#16260642)
You effectively do specify your fields before runtime in Rails, though, in the form of your migrations. Furthermore all of the associations (belongs_to, etc), are arguably also specified before runtime since those helpers run when the class is parsed.
Re:Reducing Memory Usage in Ruby by eropple on Friday February 09, 2018 @02:20AM (#16338521)
I frequently don't use Ruby-based migrations. I use datastores defined elsewhere and use Sequel as a convenient and easy interface for tasks against those datastores.

You're trying to slice too fine. Crystal can't do this. That's OK. Own it, don't try to hide it.