Refs #31187 -- Added total_unique_constraints property to model's Options.

django/db/models/base.py

@@ -19,7 +19,7 @@ from django.db.models import (
     NOT_PROVIDED, ExpressionWrapper, IntegerField, Max, Value,
 )
 from django.db.models.constants import LOOKUP_SEP
-from django.db.models.constraints import CheckConstraint, UniqueConstraint
+from django.db.models.constraints import CheckConstraint
 from django.db.models.deletion import CASCADE, Collector
 from django.db.models.fields.related import (
     ForeignObjectRel, OneToOneField, lazy_related_operation, resolve_relation,
@@ -1023,12 +1023,14 @@ class Model(metaclass=ModelBase):
         unique_checks = []
 
         unique_togethers = [(self.__class__, self._meta.unique_together)]
-        constraints = [(self.__class__, self._meta.constraints)]
+        constraints = [(self.__class__, self._meta.total_unique_constraints)]
         for parent_class in self._meta.get_parent_list():
             if parent_class._meta.unique_together:
                 unique_togethers.append((parent_class, parent_class._meta.unique_together))
-            if parent_class._meta.constraints:
+            if parent_class._meta.total_unique_constraints:
-                constraints.append((parent_class, parent_class._meta.constraints))
+                constraints.append(
+                    (parent_class, parent_class._meta.total_unique_constraints)
+                )
 
         for model_class, unique_together in unique_togethers:
             for check in unique_together:
@@ -1038,10 +1040,7 @@ class Model(metaclass=ModelBase):
 
         for model_class, model_constraints in constraints:
             for constraint in model_constraints:
-                if (isinstance(constraint, UniqueConstraint) and
+                if not any(name in exclude for name in constraint.fields):
-                        # Partial unique constraints can't be validated.
-                        constraint.condition is None and
-                        not any(name in exclude for name in constraint.fields)):
                     unique_checks.append((model_class, constraint.fields))
 
         # These are checks for the unique_for_<date/year/month>.

django/db/models/options.py

@@ -7,7 +7,7 @@ from django.apps import apps
 from django.conf import settings
 from django.core.exceptions import FieldDoesNotExist
 from django.db import connections
-from django.db.models import AutoField, Manager, OrderWrt
+from django.db.models import AutoField, Manager, OrderWrt, UniqueConstraint
 from django.db.models.query_utils import PathInfo
 from django.utils.datastructures import ImmutableList, OrderedSet
 from django.utils.functional import cached_property
@@ -827,6 +827,18 @@ class Options:
         self._get_fields_cache[cache_key] = fields
         return fields
 
+    @cached_property
+    def total_unique_constraints(self):
+        """
+        Return a list of total unique constraints. Useful for determining set
+        of fields guaranteed to be unique for all rows.
+        """
+        return [
+            constraint
+            for constraint in self.constraints
+            if isinstance(constraint, UniqueConstraint) and constraint.condition is None
+        ]
+
     @cached_property
     def _property_names(self):
         """Return a set of the names of the properties defined on the model."""