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Validators
These validators are available from the django.contrib.postgres.validators module.
KeysValidator
  - class KeysValidator(keys, strict=False, messages=None)
- 
    Validates that the given keys are contained in the value. If strictisTrue, then it also checks that there are no other keys present.The messagespassed should be a dict containing the keysmissing_keysand/orextra_keys.Note Note that this checks only for the existence of a given key, not that the value of a key is non-empty. 
Range validators
RangeMaxValueValidator
  - class RangeMaxValueValidator(limit_value, message=None)
- 
    Validates that the upper bound of the range is not greater than limit_value.
RangeMinValueValidator
  - class RangeMinValueValidator(limit_value, message=None)
- 
    Validates that the lower bound of the range is not less than the limit_value.
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Licensed under the BSD License.
 https://docs.djangoproject.com/en/3.1/ref/contrib/postgres/validators/