def group_objects_by_model(objects):
    """ Group objects by their models

    Args:
        objects (:obj:`list` of :obj:`Model`): list of model objects

    Returns:
        :obj:`dict`: dictionary with object grouped by their class
    """
    grouped_objects = {}
    for obj in objects:
        if obj.__class__ not in grouped_objects:
            grouped_objects[obj.__class__] = []
        if obj not in grouped_objects[obj.__class__]:
            grouped_objects[obj.__class__].append(obj)
    return grouped_objects