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to_objects.rb

This Ruby code snippet demonstrates the use of the CSV class to read a CSV file with a specific encoding, and then converts the data into an array of hashes. It also defines a custom class called Family that has an attribute children, which is an array of strings representing child names. The code iterates over the hashes in the data array and creates instances of the Family class for each parent name found in the data. It then adds the child names to the corresponding family instance using the children attribute. Finally, it returns the array of Family instances.

Here is an example of how this code might be used:

input_file = "input/text/group.csv"
encoding = "BOM|UTF-8"
headers = true
data = CSV.read(input_file, encoding: encoding, headers: headers).map(&:to_h)

families = []
data.each do |hash|
  parent = hash["parent"]
  if parent.nil?
    families.last.children << hash["child"]
  else
    families << Family.new(parent)
    families.last.children << hash["child"]
  end
end

puts families

This code reads a CSV file called “group.csv” with the specified encoding and headers, converts the data into an array of hashes using the map method, and then iterates over the hashes and creates instances of the Family class for each parent name found in the data. It adds the child names to the corresponding family instance using the children attribute, and finally returns the array of Family instances.

The output of this code would be an array of Family instances, where each instance has a parent attribute and a children attribute containing an array of strings representing the child names. For example:

families = [
  { parent: "John", children: ["Alice", "Bob"] },
  { parent: "Jane", children: ["Charlie", "David"] }
]

This code demonstrates how to use the CSV class to read a CSV file with a specific encoding and headers, and then convert the data into an array of hashes. It also shows how to define a custom class called Family that has an attribute children, which is an array of strings representing child names. The code uses this class to create instances of Family for each parent name found in the data, and adds the child names to the corresponding family instance using the children attribute.

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:0x00007ffad2e3d878
  @children=["value0", "value1", "value2"],
  @parent="id1">,
 #<Family:0x00007ffad2e3d1e8
  @children=["value3", "value4", "value5", "value6", "value7"],
  @parent="id2">,
 #<Family:0x00007ffad2e3d198 @children=["value8", "value9"], @parent="id3">]

Executed with Ruby 3.4.4.