[Rails-core] [ann] Super DRY models - Auto-associations and validations

[David Heinemeier Hansson]

> Its probably a style preference for agile developers as to whether they are
> happy to immediately start work with derived associations (like the derived
> attr_accessors for fields in ARs now) instead of explicitly defining them.
> "Opinions" are great; so is choice. :)

I agree. With Rails, the split is that opinions go into core and
options go into plugins.
-- 
David Heinemeier Hansson
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