CODEWITHSUNDEEP
pythondjango
user730936
user730936

Reputation: 139

User defined validators in Django fields

Django lets you define validators of a model field like this:

field = models.CharField(..,validators=[],..)

If I were to allow users to attach validators to a field, what would be the best way?

For instance, let's say the user would like to apply a RegexValidator in this field where the regex parameter is defined by them. How would I achive that behavior?

Thanks.

Upvotes: 1

Views: 110

Answers (1)

aquavitae
aquavitae

Reputation: 19114

How about a comma-separated list of names in a separate field and a wrapper property, e.g.:

import django.core.validators as validator_module

# Build a map of available validators.  This code is not foolproof
# and might be better as a static dict, but it gives the idea.
validator_map = {}
for name, obj in validator_module.__dict__.items():
    if name.startswith('validate') pr name.endswith('Validator'):
        validator_map[name] = obj

class MyModel(Model):
    value = CharField()
    value_validators = TextField()

    def set_value(self, value):
        'Run validators and store the value'
        vnames = self.value_validators.split(',')
        for vname in vnames:
            validator = validator_map[vname]
            validator(value)
        self.value = value

Upvotes: 1

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