How to restart id counting on a table in PostgreSQL after deleting some previous data?

If you truncate the table you can use the RESTART IDENTITY clause on the end.

Example:

TRUNCATE TABLE foo RESTART IDENTITY;

You could do it in the following way:

ActiveRecord::Base.connection.execute("TRUNCATE TABLE your_table_name RESTART IDENTITY")

You can do it directly in PostgreSQL using "alter sequence": http://www.postgresql.org/docs/current/static/sql-altersequence.html

Particularly "restart with"

I don't know how you would do it via the rails abstraction.

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