Truncate all tables in rails

truncate_rails_tables.rb

ActiveRecord::Base.establish_connection
ActiveRecord::Base.connection.execute("SET FOREIGN_KEY_CHECKS=0;")

ActiveRecord::Base.connection.tables.each do |table|
  next if table == 'schema_migrations'

  case ActiveRecord::Base.connection.adapter_name.downcase.to_sym
    when :mysql2 || :postgresql
      ActiveRecord::Base.connection.execute("TRUNCATE #{table}")
    when :sqlite
      ActiveRecord::Base.connection.execute("DELETE FROM #{table}")
  end
end

ActiveRecord::Base.connection.execute("SET FOREIGN_KEY_CHECKS=1;")