Completely useless Array adapter for ROM because why not

rom-array-adapter.rb

class ArrayAdapter < ROM::Adapter
  def self.schemes
    [:array]
  end

  def initialize(uri)
    super
    @connection = {}
  end

  def dataset(name, _header)
    @connection[name] = []
  end

  def dataset?(name)
    @connection.key?(name)
  end

  def [](name)
    @connection.fetch(name)
  end

  def extend_relation_instance(relation)
    relation.extend(Enumerable)
  end
end

ROM::Adapter.register(ArrayAdapter)

rom = ROM.setup(default: 'array://test') do
  schema do
    base_relation(:users) do
      repository :default
      attribute :name
    end
  end

  relation(:users) do
    def by_name(name)
      find_all { |user| user[:name] == name }
    end
  end
end

rom.schema.users << { name: 'Jane' }

puts rom.relations.users.by_name('Jane').first.inspect
# { :name => 'Jane' }