Deleting all records in a database table

It able to use delete_all is without SQL.

Post.delete_all

or

Post.delete_all "person_id = 5 AND (category = 'Something' OR category = 'Else')"

Delete via SQL:

Item.delete_all # accepts optional conditions

And delete by calling each model’s destroy method,

Item.destroy_all # accepts optional conditions

Completely empty the database and not just delete a model or models attached:

rake db:purge

test database.

rake db:test:purge