Type Inference

class UserResource < ApplicationResource
  attribute :name # => Anchor::Types::String
  attribute :bio # => Anchor::Types::Maybe.new(Anchor::Types::String)
  attribute :role # => Anchor::Types::String if Anchor.config.use_active_record_validations is true (true is default)
  attribute :model_override # => Anchor::Types::Unknown
  attribute :resource_override # => Anchor::Types::Unknown

  def resource_override
    nil
  end
end

class User < ApplicationRecord
  validates :role, presence: true

  def model_override
    nil
  end
end

# db/schema.rb snippet
create_table "users", force: :cascade do |t|
  t.string "name", null: false
  t.string "bio"
  t.string "role"
  t.string "model_override"
  t.string "resource_override"
end

class User < ApplicationRecord
  has_many :posts
  has_one :posts
end

class UserResource < ApplicationResource
  relationship :posts, to: :many # => Anchor::Types::Array.new(Anchor::Types::Reference.new("Post"))
end

class Post < ApplicationRecord
  belongs_to :user
  belongs_to :deleted_by, class_name: "User", optional: true
end

class PostResource < ApplicationResource
  relationship :user, to: :one # => Anchor::Types::Reference.new("User")
  relationship :deleted_by, to: :one, class_name: "User" # => Anchor::Types::Maybe.new(Anchor::Types::Reference.new("User"))
end