ROM::Schema::AssociationsDSL#one_to_one

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Establish a one-to-one association

@example using relation identifier
  one_to_one :addresses, as: :address

@example with an intermediate join relation
  one_to_one :tasks, as: :priority_task, through: :assignments

@param [Symbol] target The target relation identifier
@param [Hash] options A hash with additional options

@return [Associations::OneToOne]

@see #belongs_to

@api public
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