t() :: %Ash.Resource.Relationships.BelongsTo{
  cardinality: :one,
  define_field?: boolean(),
  description: String.t(),
  destination: Ash.resource(),
  destination_field: atom(),
  field_type: Ash.Type.t(),
  name: atom(),
  primary_key?: boolean(),
  private?: boolean(),
  required?: boolean(),
  source: Ash.resource(),
  source_field: atom() | nil,
  type: :belongs_to,
  writable?: boolean()
}