  
  What's new in Django 2.2
  ========================
  
  Check Constraints
  -----------------
  
  The new :class:`~django.db.models.CheckConstraint` class enables adding custom
  database constraints. Constraints are added to models using the
  :attr:`Meta.constraints <django.db.models.Options.constraints>` option.
  
 
</s> remove     A list of :doc:`constraints </ref/models/check-constraints>` that you want
    to define on the model::
 </s> add     A list of :doc:`constraints </ref/models/constraints>` that you want to
    define on the model:: </s> remove    check-constraints
 </s> add    constraints
Constraints
-----------
  
  What's new in Django 2.2
  ========================
  
Constraints
-----------
Constraints
-----------
  
  The new :class:`~django.db.models.CheckConstraint` class enables adding custom
  database constraints. Constraints are added to models using the
  :attr:`Meta.constraints <django.db.models.Options.constraints>` option.
  
keep keep keep keep replace replace keep keep keep keep keep
 Generalized check constraint docs for other constraints. 
docs/releases/2.2.txt