Is there any way to have multiple seeds.rb files? Any kind of 'versioning' for seed data?

You can re-use the seed task, but make it idempotent.

To make the seed idempotent, simply check for the existence of the condition before executing a command. An example: do you want to create a new admin user?

User.find_or_create_by_username(:username => "admin")

instead of

User.create(:username => "admin")

However, seed should be used to populate your database when the project is created. If you want to perform complex data seeding durin the lifecycle of the app, simply create a new rake task, execute it then remove it.

For those who have concerns about this question

We can have multiple seed files in db/seeds/ folder, and, we can write a rake task to run separate file as we desire to run

# lib/tasks/custom_seed.rake
# lib/tasks/custom_seed.rake
namespace :db do
  namespace :seed do

    Dir[File.join(Rails.root, 'db', 'seeds', '*.rb')].each do |filename|
      task_name = File.basename(filename, '.rb').intern

      task task_name => :environment do
        load(filename)
      end
    end

    task :all => :environment do
      Dir[File.join(Rails.root, 'db', 'seeds', '*.rb')].sort.each do |filename|
        load(filename)
      end
    end

  end
end

Then, in order to run specific seed file, you can just run

rake db:seed:seed_file_name

To run all the seeds file with order in that db/seeds folder, run below command

rake db:seed:all