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Editorial Team
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Asked: 2026-05-28T01:32:05+00:00

I am current developing a big migration script, where I need to do the

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I am current developing a big migration script, where I need to do the following:

1- Create new columns in table_1

2- Copy the values form table_2 to the new columns created in table_1

3- Delete table_2

I developed the up and down methods for this migration. My problem is that step 2 is just not copying my data correctly I need to be able to test/debug my code as it runs.

If there is a way please let me know. I am currently using Rails 2.3.8 but If there is a way for Rails 3 or 3.1 also please let me know.

Thanks a lot

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1 Answer

  1. Editorial Team

    To debug your data migration, you can use the ruby-debug gem and insert a breakpoint in the migration code:

    require 'ruby-debug'; debugger

    Then run the rake task:

    rake db:migrate:redo VERSION=whatever_version_number_your_migration_has

    Quick ruby-debug tutorial here.

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