# Django 2.1.8.dev20190330215650 documentation

# 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 `strict` is `True`, then it also checks that there are no other keys present.

  The `messages` passed should be a dict containing the keys `missing_keys` and/or `extra_keys`.

  주석

  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`.