Patient + PatientRepository Examples for Food Delivery

patient.rb

class Patient
	attr_accessor :room, :id
	attr_reader :name, :cured
	# STATES?
	# - @name
	# - @cured

	# attr_reader :cured

	def initialize(options = {})
		@id = options[:id]
		@name = options[:name] || ""
		@cured = options[:cured] || false
	end

	def cured?
		return @cured
	end
end

patient_repository.rb

# TODO: rename to your MODEL repository, they almost 


require "csv"
require_relative "patient" # => Dealing with a model? Require the model here


class PatientRepository

  # This method initializes with a path
  # to a csv file (see `app.rb`)
	def initialize(csv_file_path)

    # Empty list on initializing
		@patients = []
		@csv_file_path = csv_file_path
		

    # We read the CSV, and update the 
    # @patients list at the beginning!
		load_csv

	end

  # Returning all the patients, on an Array format
  def all
    return @patients
  end
  
  # Find a patient based on his ID!
  def find(patient_id)
    @patients.select { |patient| patient.id == patient_id }
  end


  # Add a patient to the Array/List of Patients
  # And write to the csv afterwards
	def add_patient(patient)

		patient.id = @next_id
		@patients << patient

		write_to_csv
	end


  # Delete Patient
	def delete(patient_index)
		@patients.delete_at(patient_index)

		write_to_csv
	end



  private

  # Common instruction: it updates the CSV everytime
  # we change @patients 
  def write_to_csv

    CSV.open(@csv_file_path, 'wb') do |csv|
      csv <<  %w(id name cured)

      @patients.each do |patient|

        # UPDATE: we add new fields to the initialize
        # now that we have more of them
        # See line 19, we update it as well
      csv << [patient.id, patient.name, patient.cured]    
     end
    end

    get_next_id
  end

  def load_csv

    csv_options = { headers: :first_row, header_converters: :symbol }

    CSV.foreach(@csv_file_path, csv_options) do |row|
      # if row[:cured] == "true"
      #   true
      # else
      #   false
      # end
      # row => { id: "", name: "", cured: ""}

      # IF YOU NEED TO CONVERT FIELDS, DO THEM BELOW!!

      row[:id]    = row[:id].to_i          # Convert column to Fixnum
      row[:cured] = row[:cured] == "true"  # Convert column to boolean
      @patients << Patient.new(row)

    end

    get_next_id

  end


  def get_next_id
    # If patients empty, the ID is 1
    # If not, it's last patient  id + 1 
    @next_id = @patients.empty? ? 1 : @patients.last.id + 1

  end


end

test_patient.rb

require_relative "patient"
require_relative "patient_repository"


# Instantiating our repository,
# so we know where to store Patients
csv_file   = File.join(__dir__, 'patients.csv')
repo = PatientRepository.new(csv_file)


# New instances of patient
luiz = Patient.new(name: "Luiz")
ronalson = Patient.new(name: "Ronalson")


# Add the patient to the CSV/Repo
repo.add_patient(luiz)
repo.add_patient(ronalson)

Done!