Fixed #33342 -- Added support for using OpClass() in exclusion constraints.

docs/ref/contrib/postgres/constraints.txt

@@ -53,6 +53,10 @@ operators with strings. For example::
 
     Only commutative operators can be used in exclusion constraints.
 
+.. versionchanged:: 4.1
+
+    Support for the ``OpClass()`` expression was added.
+
 ``index_type``
 --------------
 
@@ -143,6 +147,20 @@ For example::
 
 creates an exclusion constraint on ``circle`` using ``circle_ops``.
 
+Alternatively, you can use
+:class:`OpClass() <django.contrib.postgres.indexes.OpClass>` in
+:attr:`~ExclusionConstraint.expressions`::
+
+    ExclusionConstraint(
+        name='exclude_overlapping_opclasses',
+        expressions=[(OpClass('circle', 'circle_ops'), RangeOperators.OVERLAPS)],
+    )
+
+.. versionchanged:: 4.1
+
+    Support for specifying operator classes with the ``OpClass()`` expression
+    was added.
+
 Examples
 --------
 

docs/ref/contrib/postgres/indexes.txt

@@ -150,10 +150,10 @@ available from the ``django.contrib.postgres.indexes`` module.
 .. class:: OpClass(expression, name)
 
     An ``OpClass()`` expression represents the ``expression`` with a custom
-    `operator class`_ that can be used to define functional indexes or unique
-    constraints. To use it, you need to add ``'django.contrib.postgres'`` in
-    your :setting:`INSTALLED_APPS`. Set the ``name`` parameter to the name of
-    the `operator class`_.
+    `operator class`_ that can be used to define functional indexes, functional
+    unique constraints, or exclusion constraints. To use it, you need to add
+    ``'django.contrib.postgres'`` in your :setting:`INSTALLED_APPS`. Set the
+    ``name`` parameter to the name of the `operator class`_.
 
     For example::
 
@@ -163,8 +163,7 @@ available from the ``django.contrib.postgres.indexes`` module.
         )
 
     creates an index on ``Lower('username')`` using ``varchar_pattern_ops``.
-
-    Another example::
+    ::
 
         UniqueConstraint(
             OpClass(Upper('description'), name='text_pattern_ops'),
@@ -173,9 +172,23 @@ available from the ``django.contrib.postgres.indexes`` module.
 
     creates a unique constraint on ``Upper('description')`` using
     ``text_pattern_ops``.
+    ::
+
+        ExclusionConstraint(
+            name='exclude_overlapping_ops',
+            expressions=[
+                (OpClass('circle', name='circle_ops'), RangeOperators.OVERLAPS),
+            ],
+        )
+
+    creates an exclusion constraint on ``circle`` using ``circle_ops``.
 
     .. versionchanged:: 4.0
 
         Support for functional unique constraints was added.
 
+    .. versionchanged:: 4.1
+
+        Support for exclusion constraints was added.
+
     .. _operator class: https://www.postgresql.org/docs/current/indexes-opclass.html