How to reset a single table in rails?

Question

I want the primary key values to start from 1 again.

Answer 1

A lot of people (like me) come here to find how to delete all the data in the table. Here you go:

$ rails console  > ModelName.delete_all 

or

> ModelName.destroy_all 

destroy_all checks dependencies and callbacks, and takes a little longer. delete_all is a straight SQL query.

More info here: http://apidock.com/rails/ActiveRecord/Base/delete_all/class

Answer 2

I've been using the following from rails console to delete everything in the table and then reset the index counter (Ruby 2 & Rails 4):

> ModelName.delete_all > ActiveRecord::Base.connection.reset_pk_sequence!('plural_model_name')