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to_objects.rb

This Ruby code snippet demonstrates reading CSV data, structuring it into a family tree represented by Family objects, and handling potential nil parent values. It first reads a CSV file, converts it into an array of hashes, and then processes these hashes to build a family tree where each Family object has a list of children. The code uses a Family class to represent each family unit, managing a collection of children. It handles cases where the parent is nil, appending children to the last family in the array.

Ruby code snippet

require "csv"
#=> true
data = CSV.read("input/text/group.csv", encoding: "BOM|UTF-8", headers: true).map(&:to_h)
#=> 
[{"parent" => "id1", "child" => "value0"},


class Family
  attr_accessor :children

  def initialize(parent)
      @parent = parent
      @children = []
  end
end
#=> :initialize

arr = []
#=> []
data.each do |hash|
  parent = hash["parent"]
  if parent.nil?
      arr.last.children << hash["child"]
    else
      arr << Family.new(parent)
      arr.last.children << hash["child"]
  end
end
#=> 
[{"parent" => "id1", "child" => "value0"},
 {"parent" => nil, "child" => "value1"},
 {"parent" => nil, "child" => "value2"},
 {"parent" => "id2", "child" => "value3"},
 {"parent" => nil, "child" => "value4"},
 {"parent" => nil, "child" => "value5"},
 {"parent" => nil, "child" => "value6"},
 {"parent" => nil, "child" => "value7"},
 {"parent" => "id3", "child" => "value8"},
 {"parent" => nil, "child" => "value9"}]

arr
#=> 
[#<Family:0x00007ffad5da6060
  @children=["value0", "value1", "value2"],
  @parent="id1">,
 #<Family:0x00007ffad5da5f48
  @children=["value3", "value4", "value5", "value6", "value7"],
  @parent="id2">,
 #<Family:0x00007ffad5da5ed0 @children=["value8", "value9"], @parent="id3">]

Executed with Ruby 3.4.5.