when the UniqueConstraint is violated. CheckConstraint class CheckConstraint(*, check, name) Creates a check constraint in the database. check CheckConstraint.check A Q object that specifies the check the constraint to enforce. For example, CheckConstraint(check=Q(age__gte=18), name='age_gte_18') ensures the age field is never less than 18. name CheckConstraint.name The name of the constraint. UniqueConstraint age = models.IntegerField() class Meta: constraints = [ models.CheckConstraint(check=models.Q(age__gte=18), name='age_gte_18'), ] verbose_name Options.verbose_name

respectively, by the lowercased app label and class name of the concrete model. For example CheckConstraint(condition=Q(age_gte=18), name='%(app_label)s_%(class)s_is_adult'). ## V alidation of subclass. CheckConstraint class CheckConstraint(*, condition, name, violation_error_code=None, violation_error_message=None) Creates a check constraint in the database. condition CheckConstraint.condition Expression that specifies the conditional check you want the constraint to enforce. For example, CheckConstraint(condition=Q(age_gte=18), name='age_gte_18') ensures the age field is never less than

respectively, by the lowercased app label and class name of the concrete model. For example CheckConstraint(condition=Q(age_gte=18), name='%(app_label)s_%(class)s_is_adult'). ## V alidation of subclass. class CheckConstraint(*, condition, name, violation_error_code=None, violation_error_message=None) Creates a check constraint in the database. condition CheckConstraint.condition A Q object Expression that specifies the conditional check you want the constraint to enforce. For example, CheckConstraint(condition=Q(age__gte=18), name='age_gte_18') ensures the age field is never less than

respectively, by the lowercased app label and class name of the concrete model. For example CheckConstraint(check=Q(age__gte=18), name='%(app_label)s_% (class)s_is_adult'). Validation of Constraints Constraints implemented by a subclass. CheckConstraint class CheckConstraint(*, check, name, violation_error_message=None) Creates a check constraint in the database. check CheckConstraint.check A Q object or boolean boolean Expression that specifies the check you want the constraint to enforce. For example, CheckConstraint(check=Q(age__gte=18), name='age_gte_18') ensures the age field is never less than 18. Oracle Checks

respectively, by the lowercased app label and class name of the concrete model. For example CheckConstraint(check=Q(age_gte=18), name='%(app_label)s_%(class)s_is_adult'). Constraints are subclass. ## CheckConstraint class CheckConstraint(*, check, name, violation_error_code=None, violation_error_message=None) Creates a check constraint in the database. check CheckConstraint.check A Q boolean Expression that specifies the check you want the constraint to enforce. For example, CheckConstraint(check=Q(age__gte=18), name='age_gte_18') ensures the age field is never less than 18

respectively, by the lowercased app label and class name of the concrete model. For example CheckConstraint(check=Q(age__gte=18), name='%(app_label)s_% (class)s_is_adult'). Validation of Constraints In when the UniqueConstraint is violated. CheckConstraint class CheckConstraint(*, check, name) Creates a check constraint in the database. check CheckConstraint.check A Q object or boolean Expression that enforce. For example, CheckConstraint(check=Q(age__gte=18), name='age_gte_18') ensures the age field is never less than 18. Support for boolean Expression was added. name CheckConstraint.name The name of the

respectively, by the lowercased app label and class name of the concrete model. For example CheckConstraint(check=Q(age__gte=18), name='%(app_label)s_%(class)s_is_adult'). Validation of Constraints In validation when the UniqueConstraint is violated. CheckConstraint class CheckConstraint(*, check, name) Creates a check constraint in the database. check CheckConstraint.check A Q object or boolean Expression that that specifies the check you want the constraint to enforce. For example, CheckConstraint(check=Q(age__gte=18), name='age_gte_18') ensures the age field is never less than 18. Support for boolean Expression

respectively, by the lowercase app label and class name of the concrete model. For example CheckConstraint(check=Q(age\_gte=18), name='%(app\_label)s\_%(class)s\_is\_adult').| |Validation of Constraints| implemented by a subclass. CheckConstraint class CheckConstraint(*, check, name, violation_error_message=None) Creates a check constraint in the database. check CheckConstraint.check A Q object or boolean boolean Expression that specifies the check you want the constraint to enforce. For example, CheckConstraint(check=Q(age__gte=18), name='age_gte_18') ensures the age field is never less than 18

respectively, by the lowercased app label and class name of the concrete model. For example CheckConstraint(check=Q(age_gte=18), name='%(app_label)s_%(class)s_is_adult'). Validation of Constraints implemented by a subclass. CheckConstraint class CheckConstraint(*, check, name, violation_error_message=None) Creates a check constraint in the database. check CheckConstraint.check A Q object or boolean boolean Expression that specifies the check you want the constraint to enforce. For example, CheckConstraint(check=Q(age__gte=18), name='age_gte_18') ensures the age field is never less than 18

respectively, by the lowercased app label and class name of the concrete model. For example CheckConstraint(check=Q(age__gte=18), name='%(app_label)s_%(class)s_is_adult'). Validation of Constraints subclass. ## CheckConstraint class CheckConstraint(*, check, name, violation_error_code=None, violation_error_message=None) Creates a check constraint in the database. ## check CheckConstraint.check A boolean Expression that specifies the check you want the constraint to enforce. For example, CheckConstraint(check=Q(age__gte=18), name='age_gte_18') ensures the age field is never less than 18