patient_entrance.rb

class Patient::Entrance < Salus::Model
  # ja tinha no model
  has_many :medical_cares, foreign_key: :patient_entrance_id
  
  # ja tinha no model
  has_one :first_medical_care,
    class_name: 'MedicalCare',
    foreign_key: :patient_entrance_id,
    order: MedicalCare.arel_table[:id].asc
  
  # ja tinha no model
  def self.with_first_medical_care
    where(%{
      #{quoted_table_name}.id in (
        select distinct on(smc.patient_entrance_id) smc.patient_entrance_id
        from #{MedicalCare.quoted_table_name} smc
        order by smc.patient_entrance_id, smc.id asc
      )
    })
  end
end

pdf.rb

# eu fiz
report.patient_entrances.each do |patient_entrance|
      table_data << [
        { content: patient_entrance.first_medical_care.patient_name },
        { content: I18n.l(patient_entrance.first_medical_care.patient_birthdate) },
        { content: patient_entrance.first_medical_care.patient_mother },
        { content: I18n.l(patient_entrance.first_medical_care.created_at) },
        { content: patient_entrance.first_medical_care.occupation_name }
      ]
    end

report.rb

# eu fiz
def patient_entrances
    Patient::Entrance
      .with_first_medical_care
      .between(start_date, end_date)
  end