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doodle/json

Doodle::JSON adds the #to_json and from_json methods. To use it you must have the json gem installed.

Assuming the following definition:

require 'doodle'
require 'doodle/json'
class Name < Doodle
  has :value, :kind => String
end
class Age < Doodle
  has :value, :kind => Integer
end
class Person < Doodle
  has Name
  has Age
end

You can output JSON using object.to_json:

person = Person do
  name "Corum"
  age 999
end
puts person.to_json

to get the output:

{"json_class":"Person","data":{"name":{"json_class":"Name","data":{"value":"Corum"}},"age":{"json_class":"Age","data":{"value":999}}}}

and load from a JSON source using Doodle.from_json:

person = Doodle.from_json(<<EOT)
{
  "json_class": "Person",
  "data": {
    "name": {
      "json_class": "Name",
      "data": {
        "value":"Corum"
      }
    },
    "age": {
      "json_class": "Age",
      "data": {
        "value":999
      }
    }
  }
}
EOT
pp person
# >> #<Person:0x1148538
# >>  @age=#<Age:0x114b0f8 @value=999>,
# >>  @name=#<Name:0x114e3fc @value="Corum">>

If you want basic output without all the json_class and data members, use to_hash before the to_json:

{"name":{"value":"Corum"},"age":{"value":999}}

Also, remember that doodles can be initialized from hashes, so the following is also possible:

json = '{"name": "Corum", "age": 999}'
person = Person.from_json(json)
pp person
# >> #<Person:0x114ec08
# >>  @age=#<Age:0x11482e0 @value=999>,
# >>  @name=#<Name:0x114c610 @value="Corum">>
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