rest_framework.validators.UniqueValidator

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def get_field_kwargs(field_name, model_field):
    """
    Creates a default instance of a basic non-relational field.
    """
    kwargs = {}
    validator_kwarg = list(model_field.validators)

    # The following will only be used by ModelField classes.
    # Gets removed for everything else.
    kwargs['model_field'] = model_field

    if model_field.verbose_name and needs_label(model_field, field_name):
        kwargs['label'] = capfirst(model_field.verbose_name)

    if model_field.help_text:
        kwargs['help_text'] = model_field.help_text

    max_digits = getattr(model_field, 'max_digits', None)
    if max_digits is not None:
        kwargs['max_digits'] = max_digits

    decimal_places = getattr(model_field, 'decimal_places', None)
    if decimal_places is not None:
        kwargs['decimal_places'] = decimal_places

    if isinstance(model_field, models.TextField):
        kwargs['style'] = {'base_template': 'textarea.html'}

    if isinstance(model_field, models.AutoField) or not model_field.editable:
        # If this field is read-only, then return early.
        # Further keyword arguments are not valid.
        kwargs['read_only'] = True
        return kwargs

    if model_field.has_default() or model_field.blank or model_field.null:
        kwargs['required'] = False

    if model_field.null and not isinstance(model_field, models.NullBooleanField):
        kwargs['allow_null'] = True

    if model_field.blank and (isinstance(model_field, models.CharField) or
                              isinstance(model_field, models.TextField)):
        kwargs['allow_blank'] = True

    if isinstance(model_field, models.FilePathField):
        kwargs['path'] = model_field.path

        if model_field.match is not None:
            kwargs['match'] = model_field.match

        if model_field.recursive is not False:
            kwargs['recursive'] = model_field.recursive

        if model_field.allow_files is not True:
            kwargs['allow_files'] = model_field.allow_files

        if model_field.allow_folders is not False:
            kwargs['allow_folders'] = model_field.allow_folders

    if model_field.choices:
        # If this model field contains choices, then return early.
        # Further keyword arguments are not valid.
        kwargs['choices'] = model_field.choices
        return kwargs

    # Our decimal validation is handled in the field code, not validator code.
    # (In Django 1.9+ this differs from previous style)
    if isinstance(model_field, models.DecimalField) and DecimalValidator:
        validator_kwarg = [
            validator for validator in validator_kwarg
            if not isinstance(validator, DecimalValidator)
        ]

    # Ensure that max_length is passed explicitly as a keyword arg,
    # rather than as a validator.
    max_length = getattr(model_field, 'max_length', None)
    if max_length is not None and (isinstance(model_field, models.CharField) or
                                   isinstance(model_field, models.TextField)):
        kwargs['max_length'] = max_length
        validator_kwarg = [
            validator for validator in validator_kwarg
            if not isinstance(validator, validators.MaxLengthValidator)
        ]

    # Ensure that min_length is passed explicitly as a keyword arg,
    # rather than as a validator.
    min_length = next((
        validator.limit_value for validator in validator_kwarg
        if isinstance(validator, validators.MinLengthValidator)
    ), None)
    if min_length is not None and isinstance(model_field, models.CharField):
        kwargs['min_length'] = min_length
        validator_kwarg = [
            validator for validator in validator_kwarg
            if not isinstance(validator, validators.MinLengthValidator)
        ]

    # Ensure that max_value is passed explicitly as a keyword arg,
    # rather than as a validator.
    max_value = next((
        validator.limit_value for validator in validator_kwarg
        if isinstance(validator, validators.MaxValueValidator)
    ), None)
    if max_value is not None and isinstance(model_field, NUMERIC_FIELD_TYPES):
        kwargs['max_value'] = max_value
        validator_kwarg = [
            validator for validator in validator_kwarg
            if not isinstance(validator, validators.MaxValueValidator)
        ]

    # Ensure that max_value is passed explicitly as a keyword arg,
    # rather than as a validator.
    min_value = next((
        validator.limit_value for validator in validator_kwarg
        if isinstance(validator, validators.MinValueValidator)
    ), None)
    if min_value is not None and isinstance(model_field, NUMERIC_FIELD_TYPES):
        kwargs['min_value'] = min_value
        validator_kwarg = [
            validator for validator in validator_kwarg
            if not isinstance(validator, validators.MinValueValidator)
        ]

    # URLField does not need to include the URLValidator argument,
    # as it is explicitly added in.
    if isinstance(model_field, models.URLField):
        validator_kwarg = [
            validator for validator in validator_kwarg
            if not isinstance(validator, validators.URLValidator)
        ]

    # EmailField does not need to include the validate_email argument,
    # as it is explicitly added in.
    if isinstance(model_field, models.EmailField):
        validator_kwarg = [
            validator for validator in validator_kwarg
            if validator is not validators.validate_email
        ]

    # SlugField do not need to include the 'validate_slug' argument,
    if isinstance(model_field, models.SlugField):
        validator_kwarg = [
            validator for validator in validator_kwarg
            if validator is not validators.validate_slug
        ]

    # IPAddressField do not need to include the 'validate_ipv46_address' argument,
    if isinstance(model_field, models.GenericIPAddressField):
        validator_kwarg = [
            validator for validator in validator_kwarg
            if validator is not validators.validate_ipv46_address
        ]

    if getattr(model_field, 'unique', False):
        unique_error_message = model_field.error_messages.get('unique', None)
        if unique_error_message:
            unique_error_message = unique_error_message % {
                'model_name': model_field.model._meta.verbose_name,
                'field_label': model_field.verbose_name
            }
        validator = UniqueValidator(
            queryset=model_field.model._default_manager,
            message=unique_error_message)
        validator_kwarg.append(validator)

    if validator_kwarg:
        kwargs['validators'] = validator_kwarg

    return kwargs

def get_relation_kwargs(field_name, relation_info):
    """
    Creates a default instance of a flat relational field.
    """
    model_field, related_model, to_many, to_field, has_through_model, reverse = relation_info
    kwargs = {
        'queryset': related_model._default_manager,
        'view_name': get_detail_view_name(related_model)
    }

    if to_many:
        kwargs['many'] = True

    if to_field:
        kwargs['to_field'] = to_field

    if has_through_model:
        kwargs['read_only'] = True
        kwargs.pop('queryset', None)

    if model_field:
        if model_field.verbose_name and needs_label(model_field, field_name):
            kwargs['label'] = capfirst(model_field.verbose_name)
        help_text = model_field.help_text
        if help_text:
            kwargs['help_text'] = help_text
        if not model_field.editable:
            kwargs['read_only'] = True
            kwargs.pop('queryset', None)
        if kwargs.get('read_only', False):
            # If this field is read-only, then return early.
            # No further keyword arguments are valid.
            return kwargs

        if model_field.has_default() or model_field.blank or model_field.null:
            kwargs['required'] = False
        if model_field.null:
            kwargs['allow_null'] = True
        if model_field.validators:
            kwargs['validators'] = model_field.validators
        if getattr(model_field, 'unique', False):
            validator = UniqueValidator(queryset=model_field.model._default_manager)
            kwargs['validators'] = kwargs.get('validators', []) + [validator]
        if to_many and not model_field.blank:
            kwargs['allow_empty'] = False

    return kwargs