JSON python to javascript

Question

I want to transfer some data from python to javascript. I use Django at python side and jQuery at javascript side.

The object I serialize at python side is a dictionary.

Besides simple objects like lists and variables, this dictionary contains instances of SomeClass. To serialize those instances I extendeded simplejson.JSONEncode like this:

class HandleSomeClass(simplejson.JSONEncoder):
    """ simplejson.JSONEncoder extension: handle SomeClass """
    def default(self, obj):
        if isinstance(obj, SomeClass):
            readyToSerialize = do_something(obj)
            readyToSerialize.magicParameter = 'SomeClass'
            return readyToSerialize
        return simplejson.JSONEncoder.default(self, obj)

This way, the SomeClass instances appear in JSON as dictionaries having magicParameter == 'SomeClass' Those instances can be nested at various deph.

Now I would like to recreate those instances at javascript side.

I basically would like to hava a JSON decoder, which will convert all dictionaries with magicParameter == 'SomeClass' to custom javascript objects using a simple object factory:

SomeClass = function( rawSomeClass ) {

    jQuery.extend( this, rawSomeClass ) // jQuery extend merges the newly-created object and the rawSomeClass object

}

and then I could add methods like this to recreate the original objects:

SomeClass.prototype.get = function( arguments ) {
    // function body

}

How to write a decoder, which will scan the JSON object and perform the convertion?

Answer 1

1. Eval the JSON string into an object
2. Run through the values of the object and identify values with magicParameter='SomeClass'
3. Run those values through a converter
4. Assign the result back to where the value initially was in the result object