CODEWITHSUNDEEP
rubyjson
Santhosh S
Santhosh S

Reputation: 1159

Ruby object to json

I am trying to create an object and convert it to json.

require 'json'

class Person
  attr_accessor :first_name, :last_name
  def to_json
    hash = {}
    self.instance_variables.each do |var|
      hash[var] = self.instance_variable_get var
    end
    hash.to_json
  end
end

person = Person.new
person.first_name = "Michael"
person.last_name = "Jordon"

I get the output:

person.to_json
# => {"@first_name":"Michael","@last_name":"Jordon"}

What's the change I have to make so that the @ symbol does not come as part of variable names in json string?

Upvotes: 0

Views: 2006

Answers (2)

Cary Swoveland
Cary Swoveland

Reputation: 110665

Just change the line:

hash[var] = self.instance_variable_get var

to:

hash[var.to_s[1..-1]] = self.instance_variable_get var

You'll get:

puts person.to_json
  #=> {"first_name":"Michael","last_name":"Jordon"}

Upvotes: 2

Wand Maker
Wand Maker

Reputation: 18762

You can use Rails Active Support JSON extension

require 'active_support/json'

class Person
  attr_accessor :first_name, :last_name
end

person = Person.new
person.first_name = "Michael"
person.last_name = "Jordon"

puts ActiveSupport::JSON.encode(person)
# {"first_name":"Michael","last_name":"Jordon"}

More options explained here - Ruby objects and JSON serialization (without Rails)

Upvotes: 1

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