How to delete all data from all tables in Rails?

Question

I can do Post.delete_all to delete all my posts, but what if I want to delete all posts, comments, blogs, etc.?

How do I iterate over all my models and

Answer 1

We have been remiss here at Stack Overflow for not mentioning the database_cleaner gem:

Database Cleaner is a set of strategies for cleaning your database in Ruby. The original use case was to ensure a clean state during tests. Each strategy is a small amount of code but is code that is usually needed in any ruby app that is testing with a database.

By 'strategy', Mr. Mabey means: truncation, transaction, and deletion.

ActiveRecord, DataMapper, Sequel, MongoMapper, Mongoid, and CouchPotato are supported.

Here is a quick code snippet from the Database Cleaner README:

require 'database_cleaner'
DatabaseCleaner.strategy = :truncation

# then, whenever you need to clean the DB
DatabaseCleaner.clean