> The solution provided by Rails is to use "rake db:setup" for fresh
> databases, but what if you need to run several migrations because you
> already have a database, but the code has changed in such a way that some of
> the earlier migration code won't run anymore?
This is off-topic.
You need to define the code you relay on in the migration file
class PostsToDasherize
table_name :posts
def dasherize!
title.dasherize!
title_will_change!
save!
end
end
class DasherizePosts < ActiveRecord::Migration
def self.up
ActiveRecord::Base.transaction do
PostsToDasherize.all.each{|p| p.dasherize! } # Use batches instead
end
end
def self.down
# ...
end
end
Robert Pankowecki
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