class Rational - json: Ruby Standard Library Documentation

# class Rational

### Public Class Methods

json_create(object) click to toggle source

See `as_json`.

    # File json/lib/json/add/rational.rb, line 9
    def self.json_create(object)
      Rational(object['n'], object['d'])
    end

### Public Instance Methods

as_json(*) click to toggle source

Methods `Rational#as_json` and `Rational.json_create` may be used to serialize and deserialize a Rational object; see Marshal.

Method `Rational#as_json` serializes `self`, returning a 2-element hash representing `self`:

    require 'json/add/rational'
    x = Rational(2, 3).as_json
    # => {"json_class"=>"Rational", "n"=>2, "d"=>3}

Method `JSON.create` deserializes such a hash, returning a Rational object:

    Rational.json_create(x)
    # => (2/3)

    # File json/lib/json/add/rational.rb, line 29
    def as_json(*)
      {
        JSON.create_id => self.class.name,
        'n'            => numerator,
        'd'            => denominator,
      }
    end

to_json(*args) click to toggle source

Returns a `JSON` string representing `self`:

    require 'json/add/rational'
    puts Rational(2, 3).to_json

Output:

    {"json_class":"Rational","n":2,"d":3}

    # File json/lib/json/add/rational.rb, line 46
    def to_json(*args)
      as_json.to_json(*args)
    end