models - meta info

class MetaInfo(models.Model):
    AVAILABLE_DATATYPES = (('int', 'Integer'),
                           ('floa', 'float'),
                           ('str', 'string'),)

    key = models.CharField(max_length=25)
    value = models.CharField(max_length=100)
    datatype = models.CharField(max_length=4, choices=AVAILABLE_DATATYPES, default='int')
    description = models.CharField(max_length=200)

    class Meta:
        ordering = ['pk',]

    def __str__(self):
        return "{0}={1}({2})".format(self.key, self.datatype, self.value)