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Editorial Team
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Asked: 2026-06-14T03:29:44+00:00

I have this testingdatabase which, by now, is stuffed with junk. Now I’ve done

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I have this testingdatabase which, by now, is stuffed with junk. Now I’ve done a few Table.destroy_all commands in the rails console which deletes all records and dependencies which is awesome. However; I’d like to truncate everything so the ID’s etc. start at 1 again. Is there any way in Rails 3?

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1 Answer

  1. Editorial Team

    The accepted answer only works if you need to recreate the whole database.
    To drop a single table (with the callbacks) and to get the IDs to start from 1:

    Model.destroy_all # Only necessary if you want to trigger callbacks.
ActiveRecord::Base.connection.execute("TRUNCATE #{table_name} RESTART IDENTITY")

    If you are using Sqlite, it does not support truncate so do the following:

    Model.destroy_all # Only necessary if you want to trigger callbacks.
ActiveRecord::Base.connection.execute("Delete from #{table_name}")
ActiveRecord::Base.connection.execute("DELETE FROM SQLITE_SEQUENCE WHERE name='#{table_name}'")
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