Creating an array within a Ruby object class

Question

I just want to write a Ruby script (no rails) with a class that contains an array of ids. Here is my original class:

# define a "Person" class to represent the three expected columns
class Person <

  # a Person has a first name, last name, and city
  Struct.new(:first_name, :last_name, :city)

  # a method to print out a csv record for the current Person.
  # note that you can easily re-arrange columns here, if desired.
  # also note that this method compensates for blank fields.
  def print_csv_record
    last_name.length==0 ? printf(",") : printf("\"%s\",", last_name)
    first_name.length==0 ? printf(",") : printf("\"%s\",", first_name)
    city.length==0 ? printf("") : printf("\"%s\"", city)
    printf("\n")
  end
end

Now I would like to add an array called ids to the class, can I include it in the Struct.new statement like Struct.new(:first_name, :last_name, :city, :ids = Array.new) or create an instance array variable or any define separate methods or something else?

I would like to then be able to do things like:

p = Person.new
p.last_name = "Jim"
p.first_name = "Plucket"
p.city = "San Diego"

#now add things to the array in the object
p.ids.push("1")
p.ids.push("55")

and iterate over the array

p.ids.each do |i|
  puts i
end

You should really be using print and puts, not printf. — Linuxios
– Linuxios, Commented Jul 10, 2012 at 20:22

Pritesh Jain · Accepted Answer · 2012-07-10 20:49:42Z

2

# define a "Person" class to represent the three expected columns
class Person
 attr_accessor :first_name,:last_name,:city ,:ids
#  Struct.new(:first_name, :last_name, :city ,:ids) #used attr_accessor instead  can be used this too 

def initialize
     self.ids = [] # on object creation initialize this to an array
end
  # a method to print out a csv record for the current Person.
  # note that you can easily re-arrange columns here, if desired.
  # also note that this method compensates for blank fields.
  def print_csv_record
    print last_name.empty? ? "," : "\"#{last_name}\","
    print first_name.empty? ? "," : "\"#{first_name}\","
    print city.empty? ? "" : "\"#{city}\","
    p "\n"
  end
end

p = Person.new
p.last_name = ""
p.first_name = "Plucket"
p.city = "San Diego"

#now add things to the array in the object
p.ids.push("1")
p.ids.push("55")

#iterate
p.ids.each do |i|
  puts i
end

edited Jul 10, 2012 at 20:49

answered Jul 10, 2012 at 20:32

Pritesh Jain

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Comments

Linuxios · Accepted Answer · 2012-07-10 20:24:13Z

2

Assuming I understand what you want, it's this simple. Add this to your Person class:

def initialize(*)
  super
  self.ids = []
end

answered Jul 10, 2012 at 20:24

Linuxios

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