Validators defined as class attributes keep previous state around

[di]

When extending the Vlad class, validators defined as class attributes will keep state from a previous validation around:

class YourFirstValidator(Vlad):
    validators = {
        'Column A': [
            UniqueValidator()
        ],
        'Column B': [
            SetValidator(['Vampire', 'Not A Vampire'])
        ]
    }

>>> vlad = YourFirstValidator(source=LocalFile('vladiate/examples/vampires.csv'))
>>> vlad.validate()
Validating YourFirstValidator(source=LocalFile('vladiate/examples/vampires.csv'))
Passed! :)
>>> vlad2 = YourFirstValidator(source=LocalFile('vladiate/examples/vampires.csv'))
>>> vlad2.validate()
Validating YourFirstValidator(source=LocalFile('vladiate/examples/vampires.csv'))
Failed :(
  UniqueValidator failed 3 time(s) (100.0%) on field: 'Column A'
    Invalid fields: ['('Count Chocula',)', '('Dracula',)', '('Vlad the Impaler',)']

For now, this can be worked around by making validators an instance variable:

class YourSecondValidator(Vlad):
    def __init__(self, *args, **kwargs):
        self.validators = {
            'Column A': [
                UniqueValidator()
            ],
            'Column B': [
                SetValidator(['Vampire', 'Not A Vampire'])
            ]
        }
        super(YourSecondValidator, self).__init__(*args, **kwargs)

>>> vlad = YourSecondValidator(source=LocalFile('vladiate/examples/vampires.csv'))
>>> vlad.validate()
Validating YourSecondValidator(source=LocalFile('vladiate/examples/vampires.csv'))
Passed! :)
>>> vlad2 = YourSecondValidator(source=LocalFile('vladiate/examples/vampires.csv'))
>>> vlad2.validate()
Validating YourSecondValidator(source=LocalFile('vladiate/examples/vampires.csv'))
Passed! :)