Unable to decode the object using jsonpickle.decode.

[piyush jajoo]

I'm generating dynamic class in python. And I need to use it to create the object. I'm able to create the object successfully and use it. But when I try to unpickle the returned JSON string, I get <typ 'dict'> instead of the original object. 

I've tried both the ways, i.e. either generate a class or create a dynamic module and create a class in the generated moduel. You can see both the codes in below snippet.

Please see the following code -

# to generate a pojo equivalent python class

   

def _create_pojo(self, pojo_class_name, param_schema):


        #extracting the properties from the parameter 'schema'        
        pojo_properties = param_schema['properties']


        #creating a list of property keys
        pojo_property_list = []
        for key in pojo_properties:
            pojo_property_list.append(key)
       
       

        source = \
            "class %s(object):\n" % ( pojo_class_name )      
        source += "    def __init__(self, %s" % ', '.join(pojo_property_list) +"):\n" #defining __init__ for the class
        for prop in pojo_property_list: #creating a variable in the __init__ method for each property in the property list
            source += "        self.%s = %s\n" % (prop, prop)


        '''m = self.importCode(source, 'test')
        print(m)
        obj = m.HelloWorldAgent_1_0_HelloWorldTopLevelType_com_tibco_tea_agent_Person('1', '1', '1')
        print(obj)
        x = jsonpickle.encode(obj)
        print(x)
        y = jsonpickle.decode(x)
        print(y)'''
       
        #generating the class code
        class_code = compile( source, "<generated class>", "exec" )
       
        fakeglobals = {}
        eval( class_code, {"object" : object}, fakeglobals )
        result = fakeglobals[ pojo_class_name ]        
        result ._source = source
       
        #adding an entry to the _object_types dictionary to avoid the creation of pojo again
        self._object_types[ pojo_class_name ] = result        
        return result

The code to call this function is as follows -

if some condition:
      object_name = ast.literal_eval(jsonpickle.encode(val)).pop('py/object')  - extracted the object_name                  
      val = jsonpickle.encode(val, unpicklable=False)

And after getting the json string back, I prepare the json string to be decoded as follows -

result['py/object'] = object_name
result = str(result).replace("'", '"')            
result = jsonpickle.decode(result)

I'm accessing them from interactive console as follows -

>>> import <my_module>
>>> t = <my_module>.<some_function>()


This is the pprint for the generated class -


'class '
'HelloWorldAgent_1_0_HelloWorldTopLevelType_com_tibco_tea_agent_Person(object):\n'
'    def __init__(self, id, i, name):\n'
'        self.id = id\n'
'        self.i = i\n'
'        self.name = name\n'


Now I'm instantiating the generated class.
>>> p = t._object_types['HelloWorldAgent_1_0_HelloWorldTopLevelType_com_tibco_tea_agent_Person']('1', '1', '1')



I'm accessing an operation which has the parameter and return type as the above generated class.
>>> t.products['HelloWorldTopLevelType'].hw8(p)

This is the result after decode, i.e. this is a dictionary, not an object - 

{'id': '1', 'i': 1, 'py/object': '__builtin__.HelloWorldAgent_1_0_HelloWorldTopLevelType_com_tibco_tea_agent_Person', 'name': '1'}

Enter code here...

[Marcin Tustin]

1. You are altering the json representation. Json pickle does not in general allow you to turn any old json into a object.

2. You do not show the json you are decoding.

3. The py/object tag must contain an importable name (it follows the same rules as when reduce returns a string in protocol 2).

Marcin

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Marcin Tustin
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