Deserialize from yaml into array of objects

Ruby
1

I have a yaml file which has many records like:

  • !ruby/object:Employee
    first_name: John
    last_name: Gippert
    gender: male
    city: Detroit
    state: MI
    Programs:
    • !ruby/object:Program
      program_id: 3
      program_name: 401K
      -can be a varied number of programs for each employee

I need to parse this yaml file into an array of Employees.

I have a class variable which is an array. I would like to populate this
array with the employees, so I can use Array.Select to search for first
name, etc.

This code doesn’t work and I am very new to Ruby. Have spent a lot of
time searching for this but cannot make it work. Please be specific and
provide details with your answers.

dep = Department.new
dep.employees= YAML::parse( File.read(“university_db.yml”))
puts(db.employee.select{ |el| el.first_name == “john” }.length)

class Department

attr_accessor :employees

def initialize
@employees= []
end
end

2

my_yaml.yml:

  • !ruby/object:Employee
    first_name: John
    last_name: Gippert
    gender: male
    city: Detroit
    state: MI
    Programs:
    • !ruby/object:Program
      program_id: 3
      program_name: 401K
    • !ruby/object:Program
      program_id: 2
      program_name: LIBOR_fixing
  • !ruby/object:Employee
    first_name: Sally
    last_name: Gippert
    gender: female
    city: Detroit
    state: MI
    Programs:
    • !ruby/object:Program
      program_id: 3
      program_name: 401K

require ‘yaml’
require ‘pp’

class Employee
attr_accessor :first_name, :last_name, :gender, :city, :state,
:Programs
end

class Program
attr_accessor :program_id, :program_name
end

x = YAML.load_file(‘my_yaml.yml’)
p x

–output:–
[#<Employee:0x00000100875fb8 @first_name=“John”, @last_name=“Gippert”,
@gender=“male”, @city=“Detroit”, @state=“MI”,
@Programs=[#<Program:0x00000100875018 @program_id=3,
@program_name=“401K”>, #<Program:0x00000100873e48 @program_id=2,
@program_name=“LIBOR_fixing”>]>, #<Employee:0x00000100873678
@first_name=“Sally”, @last_name=“Gippert”, @gender=“female”,
@city=“Detroit”, @state=“MI”, @Programs=[#<Program:0x000001008731f0
@program_id=3, @program_name=“401K”>]>]

PP.pp x

–output:–
[#<Employee:0x00000100875fb8
@Programs=
[#<Program:0x00000100875018 @program_id=3, @program_name=“401K”>,
#<Program:0x00000100873e48 @program_id=2,
@program_name=“LIBOR_fixing”>],
@city=“Detroit”,
@first_name=“John”,
@gender=“male”,
@last_name=“Gippert”,
@state=“MI”>,
#<Employee:0x00000100873678
@Programs=[#<Program:0x000001008731f0 @program_id=3,
@program_name=“401K”>],
@city=“Detroit”,
@first_name=“Sally”,
@gender=“female”,
@last_name=“Gippert”,
@state=“MI”>]

For each class present in the yaml file, its class definition must exist
in your program file.