How to reset auto increment field in a ActiveRecord migration?

Question

In my migration I have:

def up
   MyModel.destroy_all
   MyModel.create!({:id=>1,:name=>\'foo\'})
   MyModel.create!({:id=>2,:name=>\'fooBar\'})
   M         


        

Answer 1

If you are using PostgreSQL you can simply do:

ModelName.connection.execute('ALTER SEQUENCE model_name_id_seq RESTART WITH 1')

For example, resetting the auto increment field for the User model would look like:

User.connection.execute('ALTER SEQUENCE users_id_seq RESTART WITH 1')