Rails seeds for environments

db_seeds.rb

## db/seeds.rb
['all', Rails.env].each do |seed|

  seed_file = Rails.root.join('db', 'seeds', "#{seed}.rb")
  if File.exists?(seed_file)
    puts "*** Loading #{seed} seed data"
    require seed_file
  end

  seed_dir = Rails.root.join('db', 'seeds', seed)
  if File.directory?(seed_dir)
    Dir[File.join(seed_dir, "*.rb")].each do |file|
      puts "*** Loading #{seed} seed data from #{file}"
      require file
    end
  end

end

##############################
## Example of folder structure

## db/seeds/all.rb
# Seeds for all environments

## db/seeds/development.rb
# Seeds only for the "development" environment.

## db/seeds/test.rb
# Seeds only for the "test" environment.

## db/seeds/production.rb
# Seeds only for the "production" environment.

## db/seeds/development/users.rb
# Seeds only for the "development" environment.
# ... seed users ...

## db/seeds/development/articles.rb
# Seeds only for the "development" environment.
# ... seed articles ...

## db/seeds/production/users.rb
# Seeds only for the "production" environment.
# ... seed users ...

## db/seeds/production/articles.rb
# Seeds only for the "production" environment.
# ... seed articles ...

#########################################
## Recommended shared seeds files pattern

## db/seeds/shared/dev_users.rb
# Seeds for any environment but must be manually required
# ... create users only for some environments.

## db/seeds/development.rb
# Seeds only for the "development" environment.
require_relative "shared/dev_users.rb"

## db/seeds/staging.rb
# Seeds only for the "staging" environment.
require_relative "shared/dev_users.rb"

Security consideration: If a file can be dropped into /db/seeds/production/* then the attacker can load whatever they want into your project. This would require a codebase files compromise, or a server file system compromise.