  .. attribute:: Options.constraints
  
      .. versionadded:: 2.2
  
      A list of :doc:`constraints </ref/models/check-constraints>` that you want
      to define on the model::
  
          from django.db import models
  
          class Customer(models.Model):
              age = models.IntegerField()
 
</s> remove Check Constraints
-----------------
 </s> add Constraints
----------- </s> remove    check-constraints
 </s> add    constraints
    A list of :doc:`constraints </ref/models/constraints>` that you want to
    define on the model::
  .. attribute:: Options.constraints
  
      .. versionadded:: 2.2
  
    A list of :doc:`constraints </ref/models/constraints>` that you want to
    define on the model::
    A list of :doc:`constraints </ref/models/constraints>` that you want to
    define on the model::
  
          from django.db import models
  
          class Customer(models.Model):
              age = models.IntegerField()
keep keep keep keep replace replace keep keep keep keep keep
 Generalized check constraint docs for other constraints. 
docs/ref/models/options.txt