data.yml

users:
  - name: 'Jane'
    email: 'jane@doe.org'
  - name: 'John'
    email: 'john@acme.com'

rom-yaml-example.rb

require 'rom-yaml'

class Users < ROM::Relation[:yaml]
  dataset :users

  schema do
    attribute :name, ROM::Types::String
    attribute :email, ROM::Types::String
  end
end

rom = ROM.container(:yaml, File.join(__dir__, 'data.yml')) do |c|
  c.register_relation(Users)
end

# rom = ROM.container(:yaml, File.join(__dir__, 'data.yml')) do |c|
#   c.relation(:users) do
#     schema do
#       attribute :name, ROM::Types::String
#       attribute :email, ROM::Types::String
#     end
#   end
# end

p rom.relation(:users).to_a