Fixed #27996 -- Added RandomUUID function and CryptoExtension to contrib.postgres.

docs/ref/contrib/postgres/functions.txt

@@ -7,6 +7,26 @@ All of these functions are available from the
 
 .. currentmodule:: django.contrib.postgres.functions
 
+``RandomUUID``
+==============
+
+.. class:: RandomUUID()
+
+.. versionadded:: 2.0
+
+Returns a version 4 UUID.
+
+The `pgcrypto extension`_ must be installed. You can use the
+:class:`~django.contrib.postgres.operations.CryptoExtension` migration
+operation to install it.
+
+.. _pgcrypto extension: https://www.postgresql.org/docs/current/static/pgcrypto.html
+
+Usage example::
+
+    >>> from django.contrib.postgres.functions import RandomUUID
+    >>> Article.objects.update(uuid=RandomUUID())
+
 ``TransactionNow``
 ==================
 

docs/ref/contrib/postgres/operations.txt

@@ -67,6 +67,15 @@ run the query ``CREATE EXTENSION IF NOT EXISTS hstore;``.
 
     Installs the ``citext`` extension.
 
+``CryptoExtension``
+===================
+
+.. class:: CryptoExtension()
+
+    .. versionadded:: 2.0
+
+    Installs the ``pgcrypto`` extension.
+
 ``HStoreExtension``
 ===================