<commit_before>class PrisonerStep
  include NonPersistedModel
  include Person

  attribute :first_name, String
  attribute :last_name, String
  attribute :date_of_birth, Date
  attribute :number, String
  attribute :prison_id, Integer

  validates :number, format: {
    with: /\A[a-z]\d{4}[a-z]{2}\z/i
  }
  validates :prison_id, presence: true

  delegate :name, to: :prison, prefix: true

  def prison
    Prison.find_by(id: prison_id)
  end
end<commit_msg>Avoid fetching prison details if id is nil<commit_after>class PrisonerStep
  include NonPersistedModel
  include Person

  attribute :first_name, String
  attribute :last_name, String
  attribute :date_of_birth, Date
  attribute :number, String
  attribute :prison_id, Integer

  validates :number, format: {
    with: /\A[a-z]\d{4}[a-z]{2}\z/i
  }
  validates :prison_id, presence: true

  delegate :name, to: :prison, prefix: true

  def prison
    prison_id ? Prison.find_by(id: prison_id) : nil
  end
end
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{'dir': 'git-commits-cleaned', 'id': '894928', 'n_tokens_mistral': 340, 'n_tokens_neox': 324, 'n_words': 92}