element.py

class MayaElement(AbstractElement):
    def __init__(self,
                 group_top='',
                 group_model='',
                 group_joint='',
                 group_nodes='',
                 group_world='',
                 parent='',
                 scale=1.0,
                 **kwargs):
        self.hierarchy = []
        self.joints = []
        self.controls = []
        self.nom = nomenclate.Nom(**kwargs)
        self.scale = scale

        print 'collecting nodes.', group_top, group_model, group_joint, group_nodes, group_world
        self.top_group = MayaNodeFactory.MayaTransform.factory(group_top)
        self.group_model = MayaNodeFactory.MayaTransform.factory(group_model)
        self.group_joint = MayaNodeFactory.MayaTransform.factory(group_joint)
        self.group_nodes = MayaNodeFactory.MayaTransform.factory(group_nodes)
        self.group_world = MayaNodeFactory.MayaTransform.factory(group_world)

        print 'done collecting nodes'
        self.register_nodes([self.top_group, self.group_model, self.group_joint, self.group_nodes, self.group_world],
                            node_type='hierarchy')
        self.SERIALIZABLE.append('scale')

        self.parent(parent)
        print 'serialized: ', self.serialize()
        self.setup_connections()
        self.imprint_serialization()

    @classmethod
    def create(cls, **kwargs):
        kwargs['name'] = kwargs.get('name', DEFAULT_ELEMENT_NAME)
        nom = nomenclate.Nom(**kwargs)

        group_top = MayaNodeFactory.MayaTransform.create(**nom.state)
        group_model = MayaNodeFactory.MayaTransform.create(parent=group_top, **nom.state)
        group_joint = MayaNodeFactory.MayaTransform.create(parent=group_top, **nom.state)
        group_nodes = MayaNodeFactory.MayaTransform.create(parent=group_top, **nom.state)
        group_world = MayaNodeFactory.MayaTransform.create(parent=group_top, **nom.state)
        group_world.set_attr('inheritsTransform', 0)
        print 'currently trying to instantiate a: ', cls
        element_instance = cls(
            group_top=group_top,
            group_model=group_model,
            group_joint=group_joint,
            group_nodes=group_nodes,
            group_world=group_world,
            **nom.state)
        element_instance.rename(**nom.state)
        #element_instance._create_joints()
        #element_instance._create_controls()
        return element_instance
    

traceback.py

Error
Traceback (most recent call last):
  File "C:\Users\andre\Documents\maya\libmayapy\unittest\case.py", line 329, in run
    testMethod()
  File "C:\Users\andre\dev\awkomodo\rigger\tests\testRigLib\testCore\testElements\test_universal.py", line 65, in test_creation
    universal = MayaNodeFactory.Universal.create(name='name', side='left')
  File "C:\Users\andre\dev\awkomodo\rigger\rig_lib\core\elements\universal.py", line 45, in create
    element_instance = super(Universal, cls).create(*args, **kwargs)
  File "C:\Users\andre\dev\awkomodo\rigger\rig_lib\core\nodes\maya\element.py", line 95, in create
    **nom.state)
  File "C:\Users\andre\dev\awkomodo\rigger\rig_lib\core\elements\universal.py", line 40, in __init__
    self.control_global_A = Control.factory(control_global_A)
  File "C:\Users\andre\dev\awkomodo\rigger\rig_lib\core\nodes\maya\transform.py", line 62, in factory
    return cls(node_reference, *args, **kwargs)
  File "C:\Users\andre\dev\awkomodo\rigger\rig_lib\core\nodes\maya\control.py", line 32, in __init__
    super(MayaControl, self).__init__(maya_transform, **kwargs)
  File "C:\Users\andre\dev\awkomodo\rigger\rig_lib\core\nodes\maya\transform.py", line 25, in __init__
    self._node_wrapper = MayaNode(node, *args, **kwargs)
  File "C:\Users\andre\dev\awkomodo\rigger\rig_lib\core\nodes\maya\node.py", line 27, in __init__
    self._dag_path = self.get_dag_node(node)
  File "C:\Users\andre\dev\awkomodo\rigger\rig_lib\core\nodes\maya\node.py", line 196, in get_dag_node
    selection_list.add(maya_transform)
RuntimeError: (kInvalidParameter): Object does not exist

universal.py

class Universal(Element):
    def __init__(self,
                 name='universal',
                 group_top='',
                 group_model='',
                 group_joint='',
                 group_nodes='',
                 group_world='',
                 control_global_A='',
                 control_global_B='',
                 parent='',
                 scale=1.0,
                 **kwargs):
        super(Universal, self).__init__(
            group_top=group_top,
            group_model=group_model,
            group_joint=group_joint,
            group_nodes=group_nodes,
            group_world=group_world,
            parent=parent,
            scale=scale,
            **kwargs)
        print "PASSED CONTROLS: ", control_global_A, control_global_B
        self.control_global_A = Control.factory(control_global_A)
        self.control_global_B = Control.factory(control_global_B)

    @classmethod
    def create(cls, **kwargs):
        element_instance = super(Universal, cls).create(**kwargs)
        element_instance.nom.childtype = 'universalA'
        element_instance.control_global_A = Control.create(
            parent=element_instance.group_top,
            **element_instance.nom.state)

        element_instance.nom.childtype = 'universalB'
        element_instance.control_global_B = Control.create(
            parent=element_instance.control_global_A.group_connection,
            **element_instance.nom.state)

        return element_instance