Truncate table(s) with rails console

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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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