[Defer all foreign keys and validations in RoR after dumping seed]

defer-FKs-and-validations-when-using-seed-dumps.rb

# Assuming 'base.rb' contains a seed dump (https://github.com/rroblak/seed_dump)

# Disable validations
ApplicationRecord.class_eval do
  def valid?(a=1)
    true
  end
end

# Not sure if the transactional code is needed...
ActiveRecord::Base.transaction do
  ActiveRecord::Base.connection.execute('set session_replication_role = replica')
  load "#{Rails.root}/db/seeds/base.rb"
  ActiveRecord::Base.connection.execute('set session_replication_role = default')
end