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

Building up on @Vlad Zloteanu's answer, here is a version to remove all tables while keeping the user records and login sessions together with some meta information. Feel free to adjust the list of tables to your requirements.

# lib/tasks/db/truncate.rake

namespace :db do
  desc 'Truncate all tables except users state and meta'
  task truncate: :environment do
    conn = ActiveRecord::Base.connection
    tables = conn.tables - %w[
      sessions
      users
      roles
      users_roles
      schema_migrations
      ar_internal_metadata
    ]
    tables.each { |t| conn.execute("TRUNCATE #{t}") }

    puts "Truncated tables\n================\n#{tables.sort.join("\n")}"
  end
end