[Rails] Which command run after change Models

Hi:
I'm reading and learning from the Rails tutorial at [1] but not building
the sample application instead I'm trying to build my own. After
generate all the migration and build the main classes for Models I made
some modifications to them in order to build relationship between tables
now I think that I need to run some command to generate the scaffold
again with proper relations, exists such command? I'm lost

[1] http://ruby.railstutorial.org/
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Ing. Reynier Perez Mira
eMail: reynierpm@gmail.com, reynierpm@hotmail.com
Skype: reynierpm
Mobile: +58 424.180.5609
Site: http://reynierpm.site90.com

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