Fix schema generate ignoring UUID column defaults

piccolo/apps/schema/commands/generate.py

@@ -370,7 +370,9 @@ def __add__(self, value: OutputSchema) -> OutputSchema:
             $""",
         re.VERBOSE,
     ),
-    UUID: None,
+    UUID: re.compile(
+        r"^(?P<value>gen_random_uuid|uuid_generate_v4|uuidv7)\(\)$"
+    ),
     Serial: None,
     ForeignKey: None,
 }
@@ -431,7 +433,11 @@ def get_column_default(
             elif column_type is JSON or column_type is JSONB:
                 return json.loads(value["value"])
             elif column_type is UUID:
-                return uuid.uuid4
+                return (
+                    defaults.uuid.UUID7()
+                    if value["value"] == "uuidv7"
+                    else uuid.uuid4
+                )
             elif column_type is Date:
                 return (
                     date.today

tests/apps/schema/commands/test_generate.py

@@ -2,6 +2,7 @@
 
 import ast
 import asyncio
+import uuid
 from typing import cast
 from unittest import TestCase
 from unittest.mock import MagicMock, patch
@@ -10,15 +11,18 @@
 from piccolo.apps.schema.commands.generate import (
     OutputSchema,
     generate,
+    get_column_default,
     get_output_schema,
 )
 from piccolo.columns.base import Column
 from piccolo.columns.column_types import (
+    UUID,
     ForeignKey,
     Integer,
     Timestamp,
     Varchar,
 )
+from piccolo.columns.defaults.uuid import UUID7
 from piccolo.columns.indexes import IndexMethod
 from piccolo.schema import SchemaManager
 from piccolo.table import Table, create_db_tables_sync
@@ -322,3 +326,29 @@ def test_exception(self, create_table_class_from_db_mock: AsyncMock):
             "Exception occurred while generating `mega_table` table: Test",
             exception_messages,
         )
+
+
+class TestGetColumnDefaultUUID(TestCase):
+    def test_gen_random_uuid(self):
+        self.assertIs(
+            get_column_default(UUID, "gen_random_uuid()", "postgres"),
+            uuid.uuid4,
+        )
+
+    def test_uuid_generate_v4(self):
+        self.assertIs(
+            get_column_default(UUID, "uuid_generate_v4()", "postgres"),
+            uuid.uuid4,
+        )
+
+    def test_uuidv7(self):
+        self.assertIsInstance(
+            get_column_default(UUID, "uuidv7()", "postgres"), UUID7
+        )
+
+    def test_unrecognised_default(self):
+        self.assertIsNone(
+            get_column_default(
+                UUID, "(md5((random())::text))::uuid", "postgres"
+            )
+        )