[storm] Size Validation

[Gerdus van Zyl]

Hi,

Is there any already built in method in storm to specify the size of a
varchar ? eg. varchar(25) that throws an exception if the string is
more than 25 chars long. On a similar note: you can currently prevent
the use of None for notnull columns using allow_none=False; is there
something that prevent an empty string?

If the above does not exist and is not planned, please take a look
below and tell me if this is close to the recommended solution:

class dcUnicode(Unicode):
    def __init__(self, name=None, primary=False,size=10, **kwargs):
        self.__size = size
        Unicode.__init__(self, name, primary, **kwargs)


    def __set__(self, obj, value):
        if isinstance(value,str):
            value = unicode(value)

        if not value == None and len(value) == 0:
            raise Exception("Empty string not allowed")

        if not value == None and len(value) == self.__size:
            raise Exception("string longer than " + str(self.__size))
        Unicode.__set__(self, obj, value)


Thank you,
Gerdus van Zyl