Re: [Rails] A Question about Model and Database?

Rails is smart enough to determine if you want to create or drop a table if you have done the migration with change

def change

  #code here

end

it only depends on how you write the commands

if you do 

  rake db:migrate

then it will create the db (if the code inside change is about it) and if you do

  rake db:rollback 

it will drop that table

in other case then

def up

  #create table here

end

def down

  #drop table here

end

take a look here

http://guides.rubyonrails.org/migrations.html

and then here

http://stackoverflow.com/questions/10365129/rails-migrations-self-up-and-self-down-versus-change

http://stackoverflow.com/questions/7600415/rails-3-generate-migration-no-up-or-down-method

there is a lot more on google

JavierQ

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