Ruby on Rails

Thank you all for the answers!

I only wished to improve I do not have to generate my model again after
database schema migration.
One person gave mi an advise to read that article
http://guides.rubyonrails.org/migrations.html
on migrations.
The next step is generating scaffold for model, controller and view.
But they are already generated and I do not want to loose their code
applying my changes.
As I see now there is no way of not regenerating model. Earlier I just
hoped it could be possible to add a piece of hand-written code to my
model to access newly added column in the last database migration.
I heavily read documentation on ruby.
Thank everybody for the answers.

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