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from django.core.exceptions import ValidationError
class UniqueValidator:
# Validators with `requires_context` will have the field instance
# passed to them when the field is instantiated.
requires_context = True
def __init__(self, queryset):
self.queryset = queryset
self.serializer_field = None
def get_queryset(self):
return self.queryset.all()
def __call__(self, value):
field = self.serializer_field
# Determine the model field name that the serializer field corresponds to.
field_name = field.source_attrs[0] if field.source_attrs else field.field_name
# Determine the existing instance, if this is an update operation.
instance = getattr(field.parent, 'instance', None)
# Ensure uniqueness.
filter_kwargs = {field_name: value}
queryset = self.get_queryset().filter(**filter_kwargs)
if instance:
queryset = queryset.exclude(pk=instance.pk)
if queryset.exists():
raise ValidationError('This field must be unique.')
class UniqueTogetherValidator:
requires_context = True
def __init__(self, queryset, fields):
self.queryset = queryset
self.fields = fields
self.serializer_field = None
def __call__(self, value):
serializer = self.serializer_field
# Determine the existing instance, if this is an update operation.
instance = getattr(serializer, 'instance', None)
# Ensure uniqueness.
filter_kwargs = dict([
(field_name, value[field_name]) for field_name in self.fields
])
queryset = self.get_queryset().filter(**filter_kwargs)
if instance:
queryset = queryset.exclude(pk=instance.pk)
if queryset.exists():
field_names = ' and '.join(self.fields)
raise ValidationError('The fields %s must make a unique set.' % field_names)
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