from jsonobject import StringProperty


def TypeProperty(value):
    """
    Shortcut for making a required property and restricting it to a single specified
    value. This adds additional validation that the objects are being wrapped as expected
    according to the type.
    """
    return StringProperty(required=True, choices=[value])


class EvaluationContext(object):
    """
    An evaluation context. Necessary for repeats to pass both the row of the repeat as well
    as the root document and the iteration number.
    """
    def __init__(self, root_doc, iteration):
        self.root_doc = root_doc
        self.iteration = iteration

from jsonobject import StringProperty


def TypeProperty(value):
    """
    Shortcut for making a required property and restricting it to a single specified
    value. This adds additional validation that the objects are being wrapped as expected
    according to the type.
    """
    return StringProperty(required=True, choices=[value])


class EvaluationContext(object):
    """
    An evaluation context. Necessary for repeats to pass both the row of the repeat as well
    as the root document and the iteration number.
    """
    def __init__(self, root_doc, iteration=0):
        self.root_doc = root_doc
        self.iteration = iteration

Set default iteration on EvaluationContext initializer
Set default iteration on EvaluationContext initializer
